Remove redundant destructors

Classes will automatically inherit the virtual-ness of their base
class destructors. If the base class already has a virtual
destructor and the derived class needs default destructor semantics
then the derived class can omit defining the destructor in favor of
the compiler automatically defining it.

This has an additional benefit of reenabling move semantics. The
presence of a user-specified destructor automatically disables move
operations.

.bazelrc

@@ -8,3 +8,4 @@ build:vs2022 --cxxopt=/std:c++17
 
 build:windows --config=vs2022
 build:linux --config=gcc11
+build:macos --cxxopt=-std=c++2b

.github/workflows/linux-bazel-builds.yml

@@ -11,7 +11,7 @@ jobs:
         compilation_mode: [fastbuild, dbg, opt]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Mount bazel cache
       uses: actions/cache@v3

.github/workflows/linux-meson-builds.yml

@@ -18,10 +18,12 @@ jobs:
             other_pkgs: clang-11
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Prepare environment
-      run: sudo apt-get install -y meson ninja-build ${{matrix.other_pkgs}}
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y meson ninja-build ${{matrix.other_pkgs}}
 
     - name: Configure build
       env:

.github/workflows/linux-other-builds.yml

@@ -29,13 +29,13 @@ jobs:
             build_type: Debug
             std: 14
             other_pkgs: g++-7
-            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON
+            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON -DCATCH_ENABLE_CMAKE_HELPER_TESTS=ON
           - cxx: g++-7
             build_description: Extras + Examples
             build_type: Release
             std: 14
             other_pkgs: g++-7
-            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON
+            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON -DCATCH_ENABLE_CMAKE_HELPER_TESTS=ON
 
           # Extras and examples with Clang-10
           - cxx: clang++-10
@@ -43,13 +43,13 @@ jobs:
             build_type: Debug
             std: 17
             other_pkgs: clang-10
-            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON
+            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON -DCATCH_ENABLE_CMAKE_HELPER_TESTS=ON
           - cxx: clang++-10
             build_description: Extras + Examples
             build_type: Release
             std: 17
             other_pkgs: clang-10
-            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON
+            cmake_configurations: -DCATCH_BUILD_EXTRA_TESTS=ON -DCATCH_BUILD_EXAMPLES=ON -DCATCH_ENABLE_CMAKE_HELPER_TESTS=ON
 
           # Configure tests with Clang-10
           - cxx: clang++-10
@@ -70,10 +70,12 @@ jobs:
 
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Prepare environment
-      run: sudo apt-get install -y ninja-build ${{matrix.other_pkgs}}
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y ninja-build ${{matrix.other_pkgs}}
 
     - name: Configure build
       working-directory: ${{runner.workspace}}

.github/workflows/linux-simple-builds.yml

@@ -83,7 +83,7 @@ jobs:
             other_pkgs: g++-10
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Add repositories for older GCC
       run: |
@@ -92,7 +92,9 @@ jobs:
       if: ${{ matrix.cxx == 'g++-5' || matrix.cxx == 'g++-6' }}
 
     - name: Prepare environment
-      run: sudo apt-get install -y ninja-build ${{matrix.other_pkgs}}
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y ninja-build ${{matrix.other_pkgs}}
 
     - name: Configure build
       working-directory: ${{runner.workspace}}

.github/workflows/mac-builds.yml

@@ -22,7 +22,7 @@ jobs:
             extra_tests: ON
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Configure build
       working-directory: ${{runner.workspace}}
@@ -42,11 +42,10 @@ jobs:
 
     - name: Build tests + lib
       working-directory: ${{runner.workspace}}/build
-      run: make -j 2
+      run: make -j `sysctl -n hw.ncpu`
 
     - name: Run tests
       env:
           CTEST_OUTPUT_ON_FAILURE: 1
       working-directory: ${{runner.workspace}}/build
-      # Hardcode 2 cores we know are there
+      run: ctest -C ${{matrix.build_type}} -j `sysctl -n hw.ncpu`
-      run: ctest -C ${{matrix.build_type}} -j 2

.github/workflows/validate-header-guards.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
 
       - name: Checkout source code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup Dependencies
         uses: actions/setup-python@v2

.github/workflows/windows-simple-builds.yml

@@ -13,7 +13,7 @@ jobs:
         build_type: [Debug, Release]
         std: [14, 17]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Configure build
         working-directory: ${{runner.workspace}}

BUILD.bazel

@@ -43,12 +43,15 @@ expand_template(
         "#cmakedefine CATCH_CONFIG_NO_GLOBAL_NEXTAFTER": "",
         "#cmakedefine CATCH_CONFIG_NO_POSIX_SIGNALS": "",
         "#cmakedefine CATCH_CONFIG_NO_USE_ASYNC": "",
+        "#cmakedefine CATCH_CONFIG_NO_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT": "",
         "#cmakedefine CATCH_CONFIG_NO_WCHAR": "",
         "#cmakedefine CATCH_CONFIG_NO_WINDOWS_SEH": "",
         "#cmakedefine CATCH_CONFIG_NOSTDOUT": "",
         "#cmakedefine CATCH_CONFIG_POSIX_SIGNALS": "",
         "#cmakedefine CATCH_CONFIG_PREFIX_ALL": "",
+        "#cmakedefine CATCH_CONFIG_PREFIX_MESSAGES": "",
         "#cmakedefine CATCH_CONFIG_SHARED_LIBRARY": "",
+        "#cmakedefine CATCH_CONFIG_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT": "",
         "#cmakedefine CATCH_CONFIG_USE_ASYNC": "",
         "#cmakedefine CATCH_CONFIG_WCHAR": "",
         "#cmakedefine CATCH_CONFIG_WINDOWS_CRTDBG": "",

CMake/CatchConfigOptions.cmake

@@ -18,10 +18,12 @@
 macro(AddOverridableConfigOption OptionBaseName)
   option(CATCH_CONFIG_${OptionBaseName} "Read docs/configuration.md for details" OFF)
   option(CATCH_CONFIG_NO_${OptionBaseName} "Read docs/configuration.md for details" OFF)
+  mark_as_advanced(CATCH_CONFIG_${OptionBaseName} CATCH_CONFIG_NO_${OptionBaseName})
 endmacro()
 
 macro(AddConfigOption OptionBaseName)
   option(CATCH_CONFIG_${OptionBaseName} "Read docs/configuration.md for details" OFF)
+  mark_as_advanced(CATCH_CONFIG_${OptionBaseName})
 endmacro()
 
 set(_OverridableOptions
@@ -41,6 +43,7 @@ set(_OverridableOptions
   "WCHAR"
   "WINDOWS_SEH"
   "GETENV"
+  "EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT"
 )
 
 foreach(OptionName ${_OverridableOptions})
@@ -61,6 +64,7 @@ set(_OtherConfigOptions
   "FAST_COMPILE"
   "NOSTDOUT"
   "PREFIX_ALL"
+  "PREFIX_MESSAGES"
   "WINDOWS_CRTDBG"
 )
 
@@ -68,11 +72,17 @@ set(_OtherConfigOptions
 foreach(OptionName ${_OtherConfigOptions})
   AddConfigOption(${OptionName})
 endforeach()
-set(CATCH_CONFIG_SHARED_LIBRARY ${BUILD_SHARED_LIBS})
+if(DEFINED BUILD_SHARED_LIBS)
+    set(CATCH_CONFIG_SHARED_LIBRARY ${BUILD_SHARED_LIBS})
+else()
+    set(CATCH_CONFIG_SHARED_LIBRARY "")
+endif()
 
 set(CATCH_CONFIG_DEFAULT_REPORTER "console" CACHE STRING "Read docs/configuration.md for details. The name of the reporter should be without quotes.")
 set(CATCH_CONFIG_CONSOLE_WIDTH "80" CACHE STRING "Read docs/configuration.md for details. Must form a valid integer literal.")
 
+mark_as_advanced(CATCH_CONFIG_SHARED_LIBRARY CATCH_CONFIG_DEFAULT_REPORTER CATCH_CONFIG_CONSOLE_WIDTH)
+
 # There is no good way to both turn this into a CMake cache variable,
 # and keep reasonable default semantics inside the project. Thus we do
 # not define it and users have to provide it as an outside variable.

CMake/CatchMiscFunctions.cmake

@@ -46,7 +46,6 @@ function(add_warnings_to_targets targets)
         set(CHECKED_WARNING_FLAGS
           "-Wabsolute-value"
           "-Wall"
-          "-Wc++20-compat"
           "-Wcall-to-pure-virtual-from-ctor-dtor"
           "-Wcast-align"
           "-Wcatch-value"
@@ -74,6 +73,7 @@ function(add_warnings_to_targets targets)
           "-Woverloaded-virtual"
           "-Wparentheses"
           "-Wpedantic"
+          "-Wredundant-decls"
           "-Wreorder"
           "-Wreturn-std-move"
           "-Wshadow"
@@ -83,7 +83,7 @@ function(add_warnings_to_targets targets)
           "-Wundef"
           "-Wuninitialized"
           "-Wunneeded-internal-declaration"
-          "-Wunreachable-code"
+          "-Wunreachable-code-aggressive"
           "-Wunused"
           "-Wunused-function"
           "-Wunused-parameter"

CMakeLists.txt

@@ -11,6 +11,7 @@ endif()
 option(CATCH_INSTALL_DOCS "Install documentation alongside library" ON)
 option(CATCH_INSTALL_EXTRAS "Install extras (CMake scripts, debugger helpers) alongside library" ON)
 option(CATCH_DEVELOPMENT_BUILD "Build tests, enable warnings, enable Werror, etc" OFF)
+option(CATCH_ENABLE_REPRODUCIBLE_BUILD "Add compiler flags for improving build reproducibility" ON)
 
 include(CMakeDependentOption)
 cmake_dependent_option(CATCH_BUILD_TESTING "Build the SelfTest project" ON "CATCH_DEVELOPMENT_BUILD" OFF)
@@ -21,6 +22,7 @@ cmake_dependent_option(CATCH_ENABLE_COVERAGE "Generate coverage for codecov.io"
 cmake_dependent_option(CATCH_ENABLE_WERROR "Enables Werror during build" ON "CATCH_DEVELOPMENT_BUILD" OFF)
 cmake_dependent_option(CATCH_BUILD_SURROGATES "Enable generating and building surrogate TUs for the main headers" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
 cmake_dependent_option(CATCH_ENABLE_CONFIGURE_TESTS "Enable CMake configuration tests. WARNING: VERY EXPENSIVE" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
+cmake_dependent_option(CATCH_ENABLE_CMAKE_HELPER_TESTS "Enable CMake helper tests. WARNING: VERY EXPENSIVE" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
 
 
 # Catch2's build breaks if done in-tree. You probably should not build
@@ -31,7 +33,7 @@ if (CMAKE_BINARY_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
 endif()
 
 project(Catch2
-  VERSION 3.3.2 # CML version placeholder, don't delete
+  VERSION 3.5.0 # CML version placeholder, don't delete
   LANGUAGES CXX
   # HOMEPAGE_URL is not supported until CMake version 3.12, which
   # we do not target yet.

CMakePresets.json

@@ -18,7 +18,8 @@
                 "CATCH_BUILD_EXAMPLES": "ON",
                 "CATCH_BUILD_EXTRA_TESTS": "ON",
                 "CATCH_BUILD_SURROGATES": "ON",
-                "CATCH_ENABLE_CONFIGURE_TESTS": "ON"
+                "CATCH_ENABLE_CONFIGURE_TESTS": "ON",
+                "CATCH_ENABLE_CMAKE_HELPER_TESTS": "ON"
             }
         }
     ]   

Doxyfile

@@ -1,4 +1,4 @@
-# Doxyfile 1.8.16
+# Doxyfile 1.9.1
 
 # This file describes the settings to be used by the documentation system
 # doxygen (www.doxygen.org) for a project.
@@ -32,7 +32,7 @@ DOXYFILE_ENCODING      = UTF-8
 # title of most generated pages and in a few other places.
 # The default value is: My Project.
 
-PROJECT_NAME           = "Catch2"
+PROJECT_NAME           = Catch2
 
 # The PROJECT_NUMBER tag can be used to enter a project or revision number. This
 # could be handy for archiving the generated documentation or if some version
@@ -51,6 +51,7 @@ PROJECT_BRIEF          = "Popular C++ unit testing framework"
 # pixels and the maximum width should not exceed 200 pixels. Doxygen will copy
 # the logo to the output directory.
 
+PROJECT_LOGO           =
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
 # into which the generated documentation will be written. If a relative path is
@@ -216,6 +217,14 @@ QT_AUTOBRIEF           = YES
 
 MULTILINE_CPP_IS_BRIEF = NO
 
+# By default Python docstrings are displayed as preformatted text and doxygen's
+# special commands cannot be used. By setting PYTHON_DOCSTRING to NO the
+# doxygen's special commands can be used and the contents of the docstring
+# documentation blocks is shown as doxygen documentation.
+# The default value is: YES.
+
+PYTHON_DOCSTRING       = YES
+
 # If the INHERIT_DOCS tag is set to YES then an undocumented member inherits the
 # documentation from any documented member that it re-implements.
 # The default value is: YES.
@@ -251,13 +260,7 @@ TAB_SIZE               = 4
 # a double escape (\\{ and \\})
 
 ALIASES                = "complexity=@par Complexity:" \
-                         "noexcept=**Noexcept**"
+                         noexcept=**Noexcept**
-
-# This tag can be used to specify a number of word-keyword mappings (TCL only).
-# A mapping has the form "name=value". For example adding "class=itcl::class"
-# will allow you to use the command class in the itcl::class meaning.
-
-TCL_SUBST              =
 
 # Set the OPTIMIZE_OUTPUT_FOR_C tag to YES if your project consists of C sources
 # only. Doxygen will then generate output that is more tailored for C. For
@@ -299,19 +302,22 @@ OPTIMIZE_OUTPUT_SLICE  = NO
 # parses. With this tag you can assign which parser to use for a given
 # extension. Doxygen has a built-in mapping, but you can override or extend it
 # using this tag. The format is ext=language, where ext is a file extension, and
-# language is one of the parsers supported by doxygen: IDL, Java, Javascript,
+# language is one of the parsers supported by doxygen: IDL, Java, JavaScript,
-# Csharp (C#), C, C++, D, PHP, md (Markdown), Objective-C, Python, Slice,
+# Csharp (C#), C, C++, D, PHP, md (Markdown), Objective-C, Python, Slice, VHDL,
 # Fortran (fixed format Fortran: FortranFixed, free formatted Fortran:
 # FortranFree, unknown formatted Fortran: Fortran. In the later case the parser
 # tries to guess whether the code is fixed or free formatted code, this is the
-# default for Fortran type files), VHDL, tcl. For instance to make doxygen treat
+# default for Fortran type files). For instance to make doxygen treat .inc files
-# .inc files as Fortran files (default is PHP), and .f files as C (default is
+# as Fortran files (default is PHP), and .f files as C (default is Fortran),
-# Fortran), use: inc=Fortran f=C.
+# use: inc=Fortran f=C.
 #
 # Note: For files without extension you can use no_extension as a placeholder.
 #
 # Note that for custom extensions you also need to set FILE_PATTERNS otherwise
-# the files are not read by doxygen.
+# the files are not read by doxygen. When specifying no_extension you should add
+# * to the FILE_PATTERNS.
+#
+# Note see also the list of default file extension mappings.
 
 EXTENSION_MAPPING      =
 
@@ -445,6 +451,19 @@ TYPEDEF_HIDES_STRUCT   = NO
 
 LOOKUP_CACHE_SIZE      = 0
 
+# The NUM_PROC_THREADS specifies the number threads doxygen is allowed to use
+# during processing. When set to 0 doxygen will based this on the number of
+# cores available in the system. You can set it explicitly to a value larger
+# than 0 to get more control over the balance between CPU load and processing
+# speed. At this moment only the input processing can be done using multiple
+# threads. Since this is still an experimental feature the default is set to 1,
+# which efficively disables parallel processing. Please report any issues you
+# encounter. Generating dot graphs in parallel is controlled by the
+# DOT_NUM_THREADS setting.
+# Minimum value: 0, maximum value: 32, default value: 1.
+
+NUM_PROC_THREADS       = 1
+
 #---------------------------------------------------------------------------
 # Build related configuration options
 #---------------------------------------------------------------------------
@@ -508,6 +527,13 @@ EXTRACT_LOCAL_METHODS  = NO
 
 EXTRACT_ANON_NSPACES   = NO
 
+# If this flag is set to YES, the name of an unnamed parameter in a declaration
+# will be determined by the corresponding definition. By default unnamed
+# parameters remain unnamed in the output.
+# The default value is: YES.
+
+RESOLVE_UNNAMED_PARAMS = YES
+
 # If the HIDE_UNDOC_MEMBERS tag is set to YES, doxygen will hide all
 # undocumented members inside documented classes or files. If set to NO these
 # members will be included in the various overviews, but no documentation
@@ -525,8 +551,8 @@ HIDE_UNDOC_MEMBERS     = NO
 HIDE_UNDOC_CLASSES     = NO
 
 # If the HIDE_FRIEND_COMPOUNDS tag is set to YES, doxygen will hide all friend
-# (class|struct|union) declarations. If set to NO, these declarations will be
+# declarations. If set to NO, these declarations will be included in the
-# included in the documentation.
+# documentation.
 # The default value is: NO.
 
 HIDE_FRIEND_COMPOUNDS  = NO
@@ -545,11 +571,18 @@ HIDE_IN_BODY_DOCS      = NO
 
 INTERNAL_DOCS          = NO
 
-# If the CASE_SENSE_NAMES tag is set to NO then doxygen will only generate file
+# With the correct setting of option CASE_SENSE_NAMES doxygen will better be
-# names in lower-case letters. If set to YES, upper-case letters are also
+# able to match the capabilities of the underlying filesystem. In case the
-# allowed. This is useful if you have classes or files whose names only differ
+# filesystem is case sensitive (i.e. it supports files in the same directory
-# in case and if your file system supports case sensitive file names. Windows
+# whose names only differ in casing), the option must be set to YES to properly
-# (including Cygwin) ands Mac users are advised to set this option to NO.
+# deal with such files in case they appear in the input. For filesystems that
+# are not case sensitive the option should be be set to NO to properly deal with
+# output files written for symbols that only differ in casing, such as for two
+# classes, one named CLASS and the other named Class, and to also support
+# references to files without having to specify the exact matching casing. On
+# Windows (including Cygwin) and MacOS, users should typically set this option
+# to NO, whereas on Linux or other Unix flavors it should typically be set to
+# YES.
 # The default value is: system dependent.
 
 CASE_SENSE_NAMES       = NO
@@ -788,7 +821,10 @@ WARN_IF_DOC_ERROR      = YES
 WARN_NO_PARAMDOC       = YES
 
 # If the WARN_AS_ERROR tag is set to YES then doxygen will immediately stop when
-# a warning is encountered.
+# a warning is encountered. If the WARN_AS_ERROR tag is set to FAIL_ON_WARNINGS
+# then doxygen will continue running as if WARN_AS_ERROR tag is set to NO, but
+# at the end of the doxygen process doxygen will return with a non-zero status.
+# Possible values are: NO, YES and FAIL_ON_WARNINGS.
 # The default value is: NO.
 
 WARN_AS_ERROR          = NO
@@ -819,13 +855,13 @@ WARN_LOGFILE           = doxygen.errors
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT  = "src/catch2"
+INPUT                  = src/catch2
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
 # libiconv (or the iconv built into libc) for the transcoding. See the libiconv
-# documentation (see: https://www.gnu.org/software/libiconv/) for the list of
+# documentation (see:
-# possible encodings.
+# https://www.gnu.org/software/libiconv/) for the list of possible encodings.
 # The default value is: UTF-8.
 
 INPUT_ENCODING         = UTF-8
@@ -838,13 +874,61 @@ INPUT_ENCODING         = UTF-8
 # need to set EXTENSION_MAPPING for the extension otherwise the files are not
 # read by doxygen.
 #
+# Note the list of default checked file patterns might differ from the list of
+# default file extension mappings.
+#
 # If left blank the following patterns are tested:*.c, *.cc, *.cxx, *.cpp,
 # *.c++, *.java, *.ii, *.ixx, *.ipp, *.i++, *.inl, *.idl, *.ddl, *.odl, *.h,
 # *.hh, *.hxx, *.hpp, *.h++, *.cs, *.d, *.php, *.php4, *.php5, *.phtml, *.inc,
-# *.m, *.markdown, *.md, *.mm, *.dox, *.py, *.pyw, *.f90, *.f95, *.f03, *.f08,
+# *.m, *.markdown, *.md, *.mm, *.dox (to be provided as doxygen C comment),
-# *.f, *.for, *.tcl, *.vhd, *.vhdl, *.ucf, *.qsf and *.ice.
+# *.py, *.pyw, *.f90, *.f95, *.f03, *.f08, *.f18, *.f, *.for, *.vhd, *.vhdl,
+# *.ucf, *.qsf and *.ice.
 
-# FILE_PATTERNS          =
+FILE_PATTERNS          = *.c \
+                         *.cc \
+                         *.cxx \
+                         *.cpp \
+                         *.c++ \
+                         *.java \
+                         *.ii \
+                         *.ixx \
+                         *.ipp \
+                         *.i++ \
+                         *.inl \
+                         *.idl \
+                         *.ddl \
+                         *.odl \
+                         *.h \
+                         *.hh \
+                         *.hxx \
+                         *.hpp \
+                         *.h++ \
+                         *.cs \
+                         *.d \
+                         *.php \
+                         *.php4 \
+                         *.php5 \
+                         *.phtml \
+                         *.inc \
+                         *.m \
+                         *.markdown \
+                         *.md \
+                         *.mm \
+                         *.dox \
+                         *.py \
+                         *.pyw \
+                         *.f90 \
+                         *.f95 \
+                         *.f03 \
+                         *.f08 \
+                         *.f18 \
+                         *.f \
+                         *.for \
+                         *.vhd \
+                         *.vhdl \
+                         *.ucf \
+                         *.qsf \
+                         *.ice
 
 # The RECURSIVE tag can be used to specify whether or not subdirectories should
 # be searched for input files as well.
@@ -968,6 +1052,7 @@ FILTER_SOURCE_PATTERNS =
 # (index.html). This can be useful if you have a project on for instance GitHub
 # and want to reuse the introduction page also for the doxygen output.
 
+USE_MDFILE_AS_MAINPAGE =
 
 #---------------------------------------------------------------------------
 # Configuration options related to source browsing
@@ -1055,6 +1140,44 @@ USE_HTAGS              = NO
 
 VERBATIM_HEADERS       = YES
 
+# If the CLANG_ASSISTED_PARSING tag is set to YES then doxygen will use the
+# clang parser (see:
+# http://clang.llvm.org/) for more accurate parsing at the cost of reduced
+# performance. This can be particularly helpful with template rich C++ code for
+# which doxygen's built-in parser lacks the necessary type information.
+# Note: The availability of this option depends on whether or not doxygen was
+# generated with the -Duse_libclang=ON option for CMake.
+# The default value is: NO.
+
+CLANG_ASSISTED_PARSING = NO
+
+# If clang assisted parsing is enabled and the CLANG_ADD_INC_PATHS tag is set to
+# YES then doxygen will add the directory of each input to the include path.
+# The default value is: YES.
+
+CLANG_ADD_INC_PATHS    = YES
+
+# If clang assisted parsing is enabled you can provide the compiler with command
+# line options that you would normally use when invoking the compiler. Note that
+# the include paths will already be set by doxygen for the files and directories
+# specified with INPUT and INCLUDE_PATH.
+# This tag requires that the tag CLANG_ASSISTED_PARSING is set to YES.
+
+CLANG_OPTIONS          =
+
+# If clang assisted parsing is enabled you can provide the clang parser with the
+# path to the directory containing a file called compile_commands.json. This
+# file is the compilation database (see:
+# http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html) containing the
+# options used when the source files were built. This is equivalent to
+# specifying the -p option to a clang tool, such as clang-check. These options
+# will then be passed to the parser. Any options specified with CLANG_OPTIONS
+# will be added as well.
+# Note: The availability of this option depends on whether or not doxygen was
+# generated with the -Duse_libclang=ON option for CMake.
+
+CLANG_DATABASE_PATH    =
+
 #---------------------------------------------------------------------------
 # Configuration options related to the alphabetical class index
 #---------------------------------------------------------------------------
@@ -1066,13 +1189,6 @@ VERBATIM_HEADERS       = YES
 
 ALPHABETICAL_INDEX     = YES
 
-# The COLS_IN_ALPHA_INDEX tag can be used to specify the number of columns in
-# which the alphabetical index list will be split.
-# Minimum value: 1, maximum value: 20, default value: 5.
-# This tag requires that the tag ALPHABETICAL_INDEX is set to YES.
-
-COLS_IN_ALPHA_INDEX    = 5
-
 # In case all classes in a project start with a common prefix, all classes will
 # be put under the same header in the alphabetical index. The IGNORE_PREFIX tag
 # can be used to specify a prefix (or a list of prefixes) that should be ignored
@@ -1211,9 +1327,9 @@ HTML_TIMESTAMP         = NO
 
 # If the HTML_DYNAMIC_MENUS tag is set to YES then the generated HTML
 # documentation will contain a main index with vertical navigation menus that
-# are dynamically created via Javascript. If disabled, the navigation index will
+# are dynamically created via JavaScript. If disabled, the navigation index will
 # consists of multiple levels of tabs that are statically embedded in every HTML
-# page. Disable this option to support browsers that do not have Javascript,
+# page. Disable this option to support browsers that do not have JavaScript,
 # like the Qt help browser.
 # The default value is: YES.
 # This tag requires that the tag GENERATE_HTML is set to YES.
@@ -1243,10 +1359,11 @@ HTML_INDEX_NUM_ENTRIES = 100
 
 # If the GENERATE_DOCSET tag is set to YES, additional index files will be
 # generated that can be used as input for Apple's Xcode 3 integrated development
-# environment (see: https://developer.apple.com/xcode/), introduced with OSX
+# environment (see:
-# 10.5 (Leopard). To create a documentation set, doxygen will generate a
+# https://developer.apple.com/xcode/), introduced with OSX 10.5 (Leopard). To
-# Makefile in the HTML output directory. Running make will produce the docset in
+# create a documentation set, doxygen will generate a Makefile in the HTML
-# that directory and running make install will install the docset in
+# output directory. Running make will produce the docset in that directory and
+# running make install will install the docset in
 # ~/Library/Developer/Shared/Documentation/DocSets so that Xcode will find it at
 # startup. See https://developer.apple.com/library/archive/featuredarticles/Doxy
 # genXcode/_index.html for more information.
@@ -1288,8 +1405,8 @@ DOCSET_PUBLISHER_NAME  = Publisher
 # If the GENERATE_HTMLHELP tag is set to YES then doxygen generates three
 # additional HTML index files: index.hhp, index.hhc, and index.hhk. The
 # index.hhp is a project file that can be read by Microsoft's HTML Help Workshop
-# (see: https://www.microsoft.com/en-us/download/details.aspx?id=21138) on
+# (see:
-# Windows.
+# https://www.microsoft.com/en-us/download/details.aspx?id=21138) on Windows.
 #
 # The HTML Help Workshop contains a compiler that can convert all HTML output
 # generated by doxygen into a single compiled HTML file (.chm). Compiled HTML
@@ -1364,7 +1481,8 @@ QCH_FILE               =
 
 # The QHP_NAMESPACE tag specifies the namespace to use when generating Qt Help
 # Project output. For more information please see Qt Help Project / Namespace
-# (see: https://doc.qt.io/archives/qt-4.8/qthelpproject.html#namespace).
+# (see:
+# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#namespace).
 # The default value is: org.doxygen.Project.
 # This tag requires that the tag GENERATE_QHP is set to YES.
 
@@ -1372,8 +1490,8 @@ QHP_NAMESPACE          = org.doxygen.Project
 
 # The QHP_VIRTUAL_FOLDER tag specifies the namespace to use when generating Qt
 # Help Project output. For more information please see Qt Help Project / Virtual
-# Folders (see: https://doc.qt.io/archives/qt-4.8/qthelpproject.html#virtual-
+# Folders (see:
-# folders).
+# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#virtual-folders).
 # The default value is: doc.
 # This tag requires that the tag GENERATE_QHP is set to YES.
 
@@ -1381,16 +1499,16 @@ QHP_VIRTUAL_FOLDER     = doc
 
 # If the QHP_CUST_FILTER_NAME tag is set, it specifies the name of a custom
 # filter to add. For more information please see Qt Help Project / Custom
-# Filters (see: https://doc.qt.io/archives/qt-4.8/qthelpproject.html#custom-
+# Filters (see:
-# filters).
+# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#custom-filters).
 # This tag requires that the tag GENERATE_QHP is set to YES.
 
 QHP_CUST_FILTER_NAME   =
 
 # The QHP_CUST_FILTER_ATTRS tag specifies the list of the attributes of the
 # custom filter to add. For more information please see Qt Help Project / Custom
-# Filters (see: https://doc.qt.io/archives/qt-4.8/qthelpproject.html#custom-
+# Filters (see:
-# filters).
+# https://doc.qt.io/archives/qt-4.8/qthelpproject.html#custom-filters).
 # This tag requires that the tag GENERATE_QHP is set to YES.
 
 QHP_CUST_FILTER_ATTRS  =
@@ -1402,9 +1520,9 @@ QHP_CUST_FILTER_ATTRS  =
 
 QHP_SECT_FILTER_ATTRS  =
 
-# The QHG_LOCATION tag can be used to specify the location of Qt's
+# The QHG_LOCATION tag can be used to specify the location (absolute path
-# qhelpgenerator. If non-empty doxygen will try to run qhelpgenerator on the
+# including file name) of Qt's qhelpgenerator. If non-empty doxygen will try to
-# generated .qhp file.
+# run qhelpgenerator on the generated .qhp file.
 # This tag requires that the tag GENERATE_QHP is set to YES.
 
 QHG_LOCATION           =
@@ -1481,6 +1599,17 @@ TREEVIEW_WIDTH         = 250
 
 EXT_LINKS_IN_WINDOW    = NO
 
+# If the HTML_FORMULA_FORMAT option is set to svg, doxygen will use the pdf2svg
+# tool (see https://github.com/dawbarton/pdf2svg) or inkscape (see
+# https://inkscape.org) to generate formulas as SVG images instead of PNGs for
+# the HTML output. These images will generally look nicer at scaled resolutions.
+# Possible values are: png (the default) and svg (looks nicer but requires the
+# pdf2svg or inkscape tool).
+# The default value is: png.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_FORMULA_FORMAT    = png
+
 # Use this tag to change the font size of LaTeX formulas included as images in
 # the HTML documentation. When you change the font size after a successful
 # doxygen run you need to manually remove any form_*.png images from the HTML
@@ -1501,8 +1630,14 @@ FORMULA_FONTSIZE       = 10
 
 FORMULA_TRANSPARENT    = YES
 
+# The FORMULA_MACROFILE can contain LaTeX \newcommand and \renewcommand commands
+# to create new LaTeX commands to be used in formulas as building blocks. See
+# the section "Including formulas" for details.
+
+FORMULA_MACROFILE      =
+
 # Enable the USE_MATHJAX option to render LaTeX formulas using MathJax (see
-# https://www.mathjax.org) which uses client side Javascript for the rendering
+# https://www.mathjax.org) which uses client side JavaScript for the rendering
 # instead of using pre-rendered bitmaps. Use this if you do not have LaTeX
 # installed or if you want to formulas look prettier in the HTML output. When
 # enabled you may also need to install MathJax separately and configure the path
@@ -1514,7 +1649,7 @@ USE_MATHJAX            = YES
 
 # When MathJax is enabled you can set the default output format to be used for
 # the MathJax output. See the MathJax site (see:
-# http://docs.mathjax.org/en/latest/output.html) for more details.
+# http://docs.mathjax.org/en/v2.7-latest/output.html) for more details.
 # Possible values are: HTML-CSS (which is slower, but has the best
 # compatibility), NativeMML (i.e. MathML) and SVG.
 # The default value is: HTML-CSS.
@@ -1530,7 +1665,7 @@ MATHJAX_FORMAT         = HTML-CSS
 # Content Delivery Network so you can quickly see the result without installing
 # MathJax. However, it is strongly recommended to install a local copy of
 # MathJax from https://www.mathjax.org before deployment.
-# The default value is: https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/.
+# The default value is: https://cdn.jsdelivr.net/npm/mathjax@2.
 # This tag requires that the tag USE_MATHJAX is set to YES.
 
 MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
@@ -1545,7 +1680,8 @@ MATHJAX_EXTENSIONS     = TeX/AMSmath \
 
 # The MATHJAX_CODEFILE tag can be used to specify a file with javascript pieces
 # of code that will be used on startup of the MathJax code. See the MathJax site
-# (see: http://docs.mathjax.org/en/latest/output.html) for more details. For an
+# (see:
+# http://docs.mathjax.org/en/v2.7-latest/output.html) for more details. For an
 # example see the documentation.
 # This tag requires that the tag USE_MATHJAX is set to YES.
 
@@ -1573,7 +1709,7 @@ MATHJAX_CODEFILE       =
 SEARCHENGINE           = YES
 
 # When the SERVER_BASED_SEARCH tag is enabled the search engine will be
-# implemented using a web server instead of a web client using Javascript. There
+# implemented using a web server instead of a web client using JavaScript. There
 # are two flavors of web server based searching depending on the EXTERNAL_SEARCH
 # setting. When disabled, doxygen will generate a PHP script for searching and
 # an index file used by the script. When EXTERNAL_SEARCH is enabled the indexing
@@ -1592,7 +1728,8 @@ SERVER_BASED_SEARCH    = NO
 #
 # Doxygen ships with an example indexer (doxyindexer) and search engine
 # (doxysearch.cgi) which are based on the open source search engine library
-# Xapian (see: https://xapian.org/).
+# Xapian (see:
+# https://xapian.org/).
 #
 # See the section "External Indexing and Searching" for details.
 # The default value is: NO.
@@ -1605,8 +1742,9 @@ EXTERNAL_SEARCH        = NO
 #
 # Doxygen ships with an example indexer (doxyindexer) and search engine
 # (doxysearch.cgi) which are based on the open source search engine library
-# Xapian (see: https://xapian.org/). See the section "External Indexing and
+# Xapian (see:
-# Searching" for details.
+# https://xapian.org/). See the section "External Indexing and Searching" for
+# details.
 # This tag requires that the tag SEARCHENGINE is set to YES.
 
 SEARCHENGINE_URL       =
@@ -1770,9 +1908,11 @@ LATEX_EXTRA_FILES      =
 
 PDF_HYPERLINKS         = YES
 
-# If the USE_PDFLATEX tag is set to YES, doxygen will use pdflatex to generate
+# If the USE_PDFLATEX tag is set to YES, doxygen will use the engine as
-# the PDF file directly from the LaTeX files. Set this option to YES, to get a
+# specified with LATEX_CMD_NAME to generate the PDF file directly from the LaTeX
-# higher quality PDF documentation.
+# files. Set this option to YES, to get a higher quality PDF documentation.
+#
+# See also section LATEX_CMD_NAME for selecting the engine.
 # The default value is: YES.
 # This tag requires that the tag GENERATE_LATEX is set to YES.
 
@@ -2204,7 +2344,7 @@ HIDE_UNDOC_RELATIONS   = YES
 # http://www.graphviz.org/), a graph visualization toolkit from AT&T and Lucent
 # Bell Labs. The other options in this section have no effect if this option is
 # set to NO
-# The default value is: NO.
+# The default value is: YES.
 
 HAVE_DOT               = YES
 
@@ -2283,10 +2423,32 @@ UML_LOOK               = NO
 # but if the number exceeds 15, the total amount of fields shown is limited to
 # 10.
 # Minimum value: 0, maximum value: 100, default value: 10.
-# This tag requires that the tag HAVE_DOT is set to YES.
+# This tag requires that the tag UML_LOOK is set to YES.
 
 UML_LIMIT_NUM_FIELDS   = 10
 
+# If the DOT_UML_DETAILS tag is set to NO, doxygen will show attributes and
+# methods without types and arguments in the UML graphs. If the DOT_UML_DETAILS
+# tag is set to YES, doxygen will add type and arguments for attributes and
+# methods in the UML graphs. If the DOT_UML_DETAILS tag is set to NONE, doxygen
+# will not generate fields with class member information in the UML graphs. The
+# class diagrams will look similar to the default class diagrams but using UML
+# notation for the relationships.
+# Possible values are: NO, YES and NONE.
+# The default value is: NO.
+# This tag requires that the tag UML_LOOK is set to YES.
+
+DOT_UML_DETAILS        = NO
+
+# The DOT_WRAP_THRESHOLD tag can be used to set the maximum number of characters
+# to display on a single line. If the actual line length exceeds this threshold
+# significantly it will wrapped across multiple lines. Some heuristics are apply
+# to avoid ugly line breaks.
+# Minimum value: 0, maximum value: 1000, default value: 17.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_WRAP_THRESHOLD     = 17
+
 # If the TEMPLATE_RELATIONS tag is set to YES then the inheritance and
 # collaboration graphs will show the relations between templates and their
 # instances.
@@ -2360,7 +2522,9 @@ DIRECTORY_GRAPH        = NO
 # Note: If you choose svg you need to set HTML_FILE_EXTENSION to xhtml in order
 # to make the SVG files visible in IE 9+ (other browsers do not have this
 # requirement).
-# Possible values are: png, jpg, gif, svg, png:gd, png:gd:gd, png:cairo,
+# Possible values are: png, png:cairo, png:cairo:cairo, png:cairo:gd, png:gd,
+# png:gd:gd, jpg, jpg:cairo, jpg:cairo:gd, jpg:gd, jpg:gd:gd, gif, gif:cairo,
+# gif:cairo:gd, gif:gd, gif:gd:gd, svg, png:gd, png:gd:gd, png:cairo,
 # png:cairo:gd, png:cairo:cairo, png:cairo:gdiplus, png:gdiplus and
 # png:gdiplus:gdiplus.
 # The default value is: png.
@@ -2476,9 +2640,11 @@ DOT_MULTI_TARGETS      = YES
 
 GENERATE_LEGEND        = YES
 
-# If the DOT_CLEANUP tag is set to YES, doxygen will remove the intermediate dot
+# If the DOT_CLEANUP tag is set to YES, doxygen will remove the intermediate
 # files that are used to generate the various graphs.
+#
+# Note: This setting is not only used for dot files but also for msc and
+# plantuml temporary files.
 # The default value is: YES.
-# This tag requires that the tag HAVE_DOT is set to YES.
 
 DOT_CLEANUP            = YES

MODULE.bazel

@@ -0,0 +1,3 @@
+module(name = "catch2")
+
+bazel_dep(name = "bazel_skylib", version = "1.5.0")

WORKSPACE.bazel

@@ -4,10 +4,10 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 http_archive(
     name = "bazel_skylib",
-    sha256 = "b8a1527901774180afc798aeb28c4634bdccf19c4d98e7bdd1ce79d1fe9aaad7",
+    sha256 = "cd55a062e763b9349921f0f5db8c3933288dc8ba4f76dd9416aac68acee3cb94",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.4.1/bazel-skylib-1.4.1.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.5.0/bazel-skylib-1.5.0.tar.gz",
-        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.4.1/bazel-skylib-1.4.1.tar.gz",
+        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.5.0/bazel-skylib-1.5.0.tar.gz",
     ],
 )
 

appveyor.yml

@@ -70,14 +70,3 @@ environment:
       additional_flags: "/permissive- /std:c++latest"
       platform: x64
       configuration: Debug
-
-    - FLAVOR: VS 2017 x64 Debug
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      platform: x64
-      configuration: Debug
-
-    - FLAVOR: VS 2017 x64 Release Coverage
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      coverage: 1
-      platform: x64
-      configuration: Debug

docs/benchmarks.md

@@ -93,7 +93,7 @@ Fibonacci
 -------------------------------------------------------------------------------
 C:\path\to\Catch2\Benchmark.tests.cpp(10)
 ...............................................................................
-benchmark name                                  samples       iterations    estimated
+benchmark name                                  samples       iterations    est run time
                                                 mean          low mean      high mean
                                                 std dev       low std dev   high std dev
 -------------------------------------------------------------------------------

docs/ci-and-misc.md

@@ -82,7 +82,7 @@ variable set to "1".
 
 ### CodeCoverage module (GCOV, LCOV...)
 
-If you are using GCOV tool to get testing coverage of your code, and are not sure how to integrate it with CMake and Catch, there should be an external example over at https://github.com/fkromer/catch_cmake_coverage
+If you are using GCOV tool to get testing coverage of your code, and are not sure how to integrate it with CMake and Catch, there should be an external example over at https://github.com/claremacrae/catch_cmake_coverage
 
 
 ### pkg-config

docs/cmake-integration.md

@@ -51,7 +51,7 @@ Include(FetchContent)
 FetchContent_Declare(
   Catch2
   GIT_REPOSITORY https://github.com/catchorg/Catch2.git
-  GIT_TAG        v3.0.1 # or a later release
+  GIT_TAG        v3.4.0 # or a later release
 )
 
 FetchContent_MakeAvailable(Catch2)
@@ -126,6 +126,7 @@ catch_discover_tests(target
                      [OUTPUT_DIR dir]
                      [OUTPUT_PREFIX prefix]
                      [OUTPUT_SUFFIX suffix]
+                     [DISCOVERY_MODE <POST_BUILD|PRE_TEST>]
 )
 ```
 
@@ -198,6 +199,16 @@ If specified, `suffix` is added to each output file name, like so
 `--out dir/<test_name>suffix`. This can be used to add a file extension to
 the output file name e.g. ".xml".
 
+* `DISCOVERY_MODE mode`
+
+If specified allows control over when test discovery is performed.
+For a value of `POST_BUILD` (default) test discovery is performed at build time.
+For a value of `PRE_TEST` test discovery is delayed until just prior to test
+execution (useful e.g. in cross-compilation environments).
+``DISCOVERY_MODE`` defaults to the value of the
+``CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE`` variable if it is not passed when
+calling ``catch_discover_tests``. This provides a mechanism for globally
+selecting a preferred test discovery behavior.
 
 ### `ParseAndAddCatchTests.cmake`
 

docs/command-line.md

@@ -85,43 +85,102 @@ Click one of the following links to take you straight to that option - or scroll
 
 <pre>&lt;test-spec> ...</pre>
 
-Test cases, wildcarded test cases, tags and tag expressions are all passed directly as arguments. Tags are distinguished by being enclosed in square brackets.
+By providing a test spec, you filter which tests will be run. If you call
+Catch2 without any test spec, then it will run all non-hidden test
+cases. A test case is hidden if it has the `[!benchmark]` tag, any tag
+with a dot at the start, e.g. `[.]` or `[.foo]`.
 
-If no test specs are supplied then all test cases, except "hidden" tests, are run.
+There are three basic test specs that can then be combined into more
-A test is hidden by giving it any tag starting with (or just) a period (```.```) - or, in the deprecated case, tagged ```[hide]``` or given name starting with `'./'`. To specify hidden tests from the command line ```[.]``` or ```[hide]``` can be used *regardless of how they were declared*.
+complex specs:
 
-Specs must be enclosed in quotes if they contain spaces. If they do not contain spaces the quotes are optional.
+  * Full test name, e.g. `"Test 1"`.
 
-Wildcards consist of the `*` character at the beginning and/or end of test case names and can substitute for any number of any characters (including none).
+    This allows only test cases whose name is "Test 1".
 
-Test specs are case insensitive.
+  * Wildcarded test name, e.g. `"*Test"`, or `"Test*"`, or `"*Test*"`.
 
-If a spec is prefixed with `exclude:` or the `~` character then the pattern matches an exclusion. This means that tests matching the pattern are excluded from the set - even if a prior inclusion spec included them. Subsequent inclusion specs will take precedence, however.
+    This allows any test case whose name ends with, starts with, or contains
-Inclusions and exclusions are evaluated in left-to-right order.
+    in the middle the string "Test". Note that the wildcard can only be at
+    the start or end.
 
-Test case examples:
+  * Tag name, e.g. `[some-tag]`.
 
+    This allows any test case tagged with "[some-tag]". Remember that some
+    tags are special, e.g. those that start with "." or with "!".
+
+
+You can also combine the basic test specs to create more complex test
+specs. You can:
+
+  * Concatenate specs to apply all of them, e.g. `[some-tag][other-tag]`.
+
+    This allows test cases that are tagged with **both** "[some-tag]" **and**
+    "[other-tag]". A test case with just "[some-tag]" will not pass the filter,
+    nor will test case with just "[other-tag]".
+
+  * Comma-join specs to apply any of them, e.g. `[some-tag],[other-tag]`.
+
+    This allows test cases that are tagged with **either** "[some-tag]" **or**
+    "[other-tag]". A test case with both will obviously also pass the filter.
+
+    Note that commas take precendence over simple concatenation. This means
+    that `[a][b],[c]` accepts tests that are tagged with either both "[a]" and
+    "[b]", or tests that are tagged with just "[c]".
+
+  * Negate the spec by prepending it with `~`, e.g. `~[some-tag]`.
+
+    This rejects any test case that is tagged with "[some-tag]". Note that
+    rejection takes precedence over other filters.
+
+    Note that negations always binds to the following _basic_ test spec.
+    This means that `~[foo][bar]` negates only the "[foo]" tag and not the
+    "[bar]" tag.
+
+Note that when Catch2 is deciding whether to include a test, first it
+checks whether the test matches any negative filters. If it does,
+the test is rejected. After that, the behaviour depends on whether there
+are positive filters as well. If there are no positive filters, all
+remaining non-hidden tests are included. If there are positive filters,
+only tests that match the positive filters are included.
+
+You can also match test names with special characters by escaping them
+with a backslash (`"\"`), e.g. a test named `"Do A, then B"` is matched
+by "Do A\, then B" test spec. Backslash also escapes itself.
+
+
+### Examples
+
+Given these TEST_CASEs,
 ```
-thisTestOnly            Matches the test case called, 'thisTestOnly'
+TEST_CASE("Test 1") {}
-"this test only"        Matches the test case called, 'this test only'
+
-these*                  Matches all cases starting with 'these'
+TEST_CASE("Test 2", "[.foo]") {}
-exclude:notThis         Matches all tests except, 'notThis'
+
-~notThis                Matches all tests except, 'notThis'
+TEST_CASE("Test 3", "[.bar]") {}
-~*private*              Matches all tests except those that contain 'private'
+
-a* ~ab* abc             Matches all tests that start with 'a', except those that
+TEST_CASE("Test 4", "[.][foo][bar]") {}
-                        start with 'ab', except 'abc', which is included
-~[tag1]                 Matches all tests except those tagged with '[tag1]'
--# [#somefile]          Matches all tests from the file 'somefile.cpp'
 ```
 
-Names within square brackets are interpreted as tags.
+this is the result of these filters
-A series of tags form an AND expression whereas a comma-separated sequence forms an OR expression. e.g.:
+```
+./tests                      # Selects only the first test, others are hidden
+./tests "Test 1"             # Selects only the first test, other do not match
+./tests ~"Test 1"            # Selects no tests. Test 1 is rejected, other tests are hidden
+./tests "Test *"             # Selects all tests.
+./tests [bar]                # Selects tests 3 and 4. Other tests are not tagged [bar]
+./tests ~[foo]               # Selects test 1, because it is the only non-hidden test without [foo] tag
+./tests [foo][bar]           # Selects test 4.
+./tests [foo],[bar]          # Selects tests 2, 3, 4.
+./tests ~[foo][bar]          # Selects test 3. 2 and 4 are rejected due to having [foo] tag
+./tests ~"Test 2"[foo]       # Selects test 4, because test 2 is explicitly rejected
+./tests [foo][bar],"Test 1"  # Selects tests 1 and 4.
+./tests "Test 1*"            # Selects test 1, wildcard can match zero characters
+```
 
-<pre>[one][two],[three]</pre>
+_Note: Using plain asterisk on a command line can cause issues with shell
-This matches all tests tagged `[one]` and `[two]`, as well as all tests tagged `[three]`
+expansion. Make sure that the asterisk is passed to Catch2 and is not
+interpreted by the shell._
 
-Test names containing special characters, such as `,` or `[` can specify them on the command line using `\`.
-`\` also escapes itself.
 
 <a id="choosing-a-reporter-to-use"></a>
 ## Choosing a reporter to use

docs/configuration.md

@@ -15,6 +15,7 @@
 [Enabling stringification](#enabling-stringification)<br>
 [Disabling exceptions](#disabling-exceptions)<br>
 [Overriding Catch's debug break (`-b`)](#overriding-catchs-debug-break--b)<br>
+[Static analysis support](#static-analysis-support)<br>
 
 Catch2 is designed to "just work" as much as possible, and most of the
 configuration options below are changed automatically during compilation,
@@ -25,7 +26,8 @@ with the same name.
 
 ## Prefixing Catch macros
 
-    CATCH_CONFIG_PREFIX_ALL
+    CATCH_CONFIG_PREFIX_ALL       // Prefix all macros with CATCH_
+    CATCH_CONFIG_PREFIX_MESSAGES  // Prefix only INFO, UNSCOPED_INFO, WARN and CAPTURE
 
 To keep test code clean and uncluttered Catch uses short macro names (e.g. ```TEST_CASE``` and ```REQUIRE```). Occasionally these may conflict with identifiers from platform headers or the system under test. In this case the above identifier can be defined. This will cause all the Catch user macros to be prefixed with ```CATCH_``` (e.g. ```CATCH_TEST_CASE``` and ```CATCH_REQUIRE```).
 
@@ -264,6 +266,31 @@ The macro will be used as is, that is, `CATCH_BREAK_INTO_DEBUGGER();`
 must compile and must break into debugger.
 
 
+## Static analysis support
+
+> Introduced in Catch2 3.4.0.
+
+Some parts of Catch2, e.g. `SECTION`s, can be hard for static analysis
+tools to reason about. Catch2 can change its internals to help static
+analysis tools reason about the tests.
+
+Catch2 automatically detects some static analysis tools (initial
+implementation checks for clang-tidy and Coverity), but you can override
+its detection (in either direction) via
+
+```
+CATCH_CONFIG_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT     // force enables static analysis help
+CATCH_CONFIG_NO_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT  // force disables static analysis help
+```
+
+_As the name suggests, this is currently experimental, and thus we provide
+no backwards compatibility guarantees._
+
+**DO NOT ENABLE THIS FOR BUILDS YOU INTEND TO RUN.** The changed internals
+are not meant to be runnable, only "scannable".
+
+
+
 ---
 
 [Home](Readme.md#top)

docs/faq.md

@@ -10,6 +10,7 @@
 [Does Catch2 support running tests in parallel?](#does-catch2-support-running-tests-in-parallel)<br>
 [Can I compile Catch2 into a dynamic library?](#can-i-compile-catch2-into-a-dynamic-library)<br>
 [What repeatability guarantees does Catch2 provide?](#what-repeatability-guarantees-does-catch2-provide)<br>
+[My build cannot find `catch2/catch_user_config.hpp`, how can I fix it?](#my-build-cannot-find-catch2catch_user_confighpp-how-can-i-fix-it)<br>
 
 
 ## How do I run global setup/teardown only if tests will be run?
@@ -28,7 +29,7 @@ depending on how often the cleanup needs to happen.
 ## Why cannot I derive from the built-in reporters?
 
 They are not made to be overridden, in that we do not attempt to maintain
-a consistent internal state if a member function is overriden, and by
+a consistent internal state if a member function is overridden, and by
 forbidding users from using them as a base class, we can refactor them
 as needed later.
 
@@ -83,12 +84,30 @@ and it is also generally repeatable across versions, but we might break
 it from time to time. E.g. we broke repeatability with previous versions
 in v2.13.4 so that test cases with similar names are shuffled better.
 
-Random generators currently rely on platform's stdlib, specifically
+Since Catch2 3.5.0 the random generators use custom distributions,
-the distributions from `<random>`. We thus provide no extra guarantee
+that should be repeatable across different platforms, with few caveats.
-above what your platform does. **Important: `<random>`'s distributions
+For details see the section on random generators in the [Generator
+documentation](generators.md#random-number-generators-details).
+
+Before this version, random generators relied on distributions from
+platform's stdlib. We thus can provide no extra guarantee on top of the
+ones given by your platform. **Important: `<random>`'s distributions
 are not specified to be repeatable across different platforms.**
 
 
+## My build cannot find `catch2/catch_user_config.hpp`, how can I fix it?
+
+`catch2/catch_user_config.hpp` is a generated header that contains user
+compile time configuration. It is generated by CMake/Meson/Bazel during
+build. If you are not using either of these, your three options are to
+
+1) Build Catch2 separately using build tool that will generate the header
+2) Use the amalgamated files to build Catch2
+3) Use CMake to configure a build. This will generate the header and you
+   can copy it into your own checkout of Catch2.
+
+
+
 ---
 
 [Home](Readme.md#top)

docs/generators.md

@@ -134,7 +134,7 @@ type, making their usage much nicer. These are
 * `map<T>(func, GeneratorWrapper<U>&&)` for `MapGenerator<T, U, Func>` (map `U` to `T`)
 * `chunk(chunk-size, GeneratorWrapper<T>&&)` for `ChunkGenerator<T>`
 * `random(IntegerOrFloat a, IntegerOrFloat b)` for `RandomIntegerGenerator` or `RandomFloatGenerator`
-* `range(Arithemtic start, Arithmetic end)` for `RangeGenerator<Arithmetic>` with a step size of `1`
+* `range(Arithmetic start, Arithmetic end)` for `RangeGenerator<Arithmetic>` with a step size of `1`
 * `range(Arithmetic start, Arithmetic end, Arithmetic step)` for `RangeGenerator<Arithmetic>` with a custom step size
 * `from_range(InputIterator from, InputIterator to)` for `IteratorGenerator<T>`
 * `from_range(Container const&)` for `IteratorGenerator<T>`
@@ -189,6 +189,31 @@ TEST_CASE("type conversion", "[generators]") {
 }
 ```
 
+
+### Random number generators: details
+
+> This section applies from Catch2 3.5.0. Before that, random generators
+> were a thin wrapper around distributions from `<random>`.
+
+All of the `random(a, b)` generators in Catch2 currently generate uniformly
+distributed number in closed interval \[a; b\]. This  is different from
+`std::uniform_real_distribution`, which should return numbers in interval
+\[a; b) (but due to rounding can end up returning b anyway), but the
+difference is intentional, so that `random(a, a)` makes sense. If there is
+enough interest from users, we can provide API to pick any of CC, CO, OC,
+or OO ranges.
+
+Unlike `std::uniform_int_distribution`, Catch2's generators also support
+various single-byte integral types, such as `char` or `bool`.
+
+Given the same seed, the output from the integral generators is
+reproducible across different platforms. For floating point generators,
+we only promise reproducibility on platforms that obey the IEEE 754
+standard, and where `float` is 4 bytes and `double` is 8 bytes. We provide
+no guarantees for `long double`, as the internals of `long double` can
+vary wildly across different platforms.
+
+
 ## Generator interface
 
 You can also implement your own generators, by deriving from the
@@ -221,3 +246,21 @@ For full example of implementing your own generator, look into Catch2's
 examples, specifically
 [Generators: Create your own generator](../examples/300-Gen-OwnGenerator.cpp).
 
+
+### Handling empty generators
+
+The generator interface assumes that a generator always has at least one
+element. This is not always true, e.g. if the generator depends on an external
+datafile, the file might be missing.
+
+There are two ways to handle this, depending on whether you want this
+to be an error or not.
+
+ * If empty generator **is** an error, throw an exception in constructor.
+ * If empty generator **is not** an error, use the [`SKIP`](skipping-passing-failing.md#skipping-test-cases-at-runtime) in constructor.
+
+
+
+---
+
+[Home](Readme.md#top)

docs/limitations.md

@@ -173,13 +173,3 @@ TEST_CASE("b") {
 
 If you are seeing a problem like this, i.e. weird test paths that trigger only under Clang with `libc++`, or only under very specific version of `libstdc++`, it is very likely you are seeing this. The only known workaround is to use a fixed version of your standard library.
 
-
-### libstdc++, `_GLIBCXX_DEBUG` macro and random ordering of tests
-
-Running a Catch2 binary compiled against libstdc++ with `_GLIBCXX_DEBUG`
-macro defined with `--order rand` will cause a debug check to trigger and
-abort the run due to self-assignment.
-[This is a known bug inside libstdc++](https://stackoverflow.com/questions/22915325/avoiding-self-assignment-in-stdshuffle/23691322)
-
-Workaround: Don't use `--order rand` when compiling against debug-enabled
-libstdc++.

docs/matchers.md

@@ -50,25 +50,43 @@ Both of the string matchers used in the examples above live in the
 `catch_matchers_string.hpp` header, so to compile the code above also
 requires `#include <catch2/matchers/catch_matchers_string.hpp>`.
 
+### Combining operators and lifetimes
+
 **IMPORTANT**: The combining operators do not take ownership of the
-matcher objects being combined. This means that if you store combined
+matcher objects being combined.
-matcher object, you have to ensure that the matchers being combined
-outlive its last use. What this means is that the following code leads
-to a use-after-free (UAF):
 
+This means that if you store combined matcher object, you have to ensure
+that the individual matchers being combined outlive the combined matcher.
+Note that the negation matcher from `!` also counts as combining matcher
+for this.
+
+Explained on an example, this is fine
 ```cpp
-#include <catch2/catch_test_macros.hpp>
+CHECK_THAT(value, WithinAbs(0, 2e-2) && !WithinULP(0., 1));
-#include <catch2/matchers/catch_matchers_string.hpp>
-
-TEST_CASE("Bugs, bugs, bugs", "[Bug]"){
-    std::string str = "Bugs as a service";
-
-    auto match_expression = Catch::Matchers::EndsWith( "as a service" ) ||
-        (Catch::Matchers::StartsWith( "Big data" ) && !Catch::Matchers::ContainsSubstring( "web scale" ) );
-    REQUIRE_THAT(str, match_expression);
-}
 ```
 
+and so is this
+```cpp
+auto is_close_to_zero = WithinAbs(0, 2e-2);
+auto is_zero          = WithinULP(0., 1);
+
+CHECK_THAT(value, is_close_to_zero && !is_zero);
+```
+
+but this is not
+```cpp
+auto is_close_to_zero = WithinAbs(0, 2e-2);
+auto is_zero          = WithinULP(0., 1);
+auto is_close_to_but_not_zero = is_close_to_zero && !is_zero;
+
+CHECK_THAT(a_value, is_close_to_but_not_zero); // UAF
+```
+
+because `!is_zero` creates a temporary instance of Negation matcher,
+which the `is_close_to_but_not_zero` refers to. After the line ends,
+the temporary is destroyed and the combined `is_close_to_but_not_zero`
+matcher now refers to non-existent object, so using it causes use-after-free.
+
 
 ## Built-in matchers
 
@@ -286,7 +304,7 @@ comparable. (e.g. you may compare `std::vector<int>` to `std::array<char>`).
 `UnorderedRangeEquals` is similar to `RangeEquals`, but the order
 does not matter. For example "1, 2, 3" would match "3, 2, 1", but not
 "1, 1, 2, 3" As with `RangeEquals`, `UnorderedRangeEquals` compares
-the individual elements using using `operator==` by default.
+the individual elements using `operator==` by default.
 
 Both `RangeEquals` and `UnorderedRangeEquals` optionally accept a
 predicate which can be used to compare the containers element-wise.

docs/opensource-users.md

@@ -95,6 +95,9 @@ A C++ client library for Consul. Consul is a distributed tool for discovering an
 ### [Reactive-Extensions/ RxCpp](https://github.com/Reactive-Extensions/RxCpp)
 A library of algorithms for values-distributed-in-time.
 
+### [SFML](https://github.com/SFML/SFML)
+Simple and Fast Multimedia Library.
+
 ### [SOCI](https://github.com/SOCI/soci)
 The C++ Database Access Library.
 
@@ -143,7 +146,7 @@ Newsbeuter is an open-source RSS/Atom feed reader for text terminals.
 A 2D, Zombie, RPG game which is being made on our own engine.
 
 ### [raspigcd](https://github.com/pantadeusz/raspigcd)
-Low level CLI app and library for execution of GCODE on Raspberry Pi without any additional microcontrolers (just RPi + Stepsticks).
+Low level CLI app and library for execution of GCODE on Raspberry Pi without any additional microcontrollers (just RPi + Stepsticks).
 
 ### [SpECTRE](https://github.com/sxs-collaboration/spectre)
 SpECTRE is a code for multi-scale, multi-physics problems in astrophysics and gravitational physics.

docs/release-notes.md

@@ -2,6 +2,8 @@
 
 # Release notes
 **Contents**<br>
+[3.5.0](#350)<br>
+[3.4.0](#340)<br>
 [3.3.2](#332)<br>
 [3.3.1](#331)<br>
 [3.3.0](#330)<br>
@@ -57,6 +59,69 @@
 
 
 
+## 3.5.0
+
+### Improvements
+* Introduced `CATCH_CONFIG_PREFIX_MESSAGES` to prefix only logging macros (#2544)
+  * This means `INFO`, `UNSCOPED_INFO`, `WARN` and `CAPTURE`.
+* Section hints in static analysis mode are now `const`
+  * This prevents Clang-Tidy from complaining about `misc-const-correctness`.
+* `from_range` generator supports C arrays and ranges that require ADL (#2737)
+* Stringification support for `std::optional` now also includes `std::nullopt` (#2740)
+* The Console reporter flushes output after writing benchmark runtime estimate.
+  * This means that you can immediately see for how long the benchmark is expected to run.
+* Added workaround to enable compilation with ICC 19.1 (#2551, #2766)
+* Compiling Catch2 for XBox should work out of the box (#2772)
+  * Catch2 should automatically disable getenv when compiled for XBox.
+* Compiling Catch2 with exceptions disabled no longer triggers `Wunused-function` (#2726)
+* **`random` Generators for integral types are now reproducible across different platforms**
+  * Unlike `<random>`, Catch2's generators also support 1 byte integral types (`char`, `bool`, ...)
+* **`random` Generators for `float` and `double` are now reproducible across different platforms**
+  * `long double` varies across different platforms too much to be reproducible
+  * This guarantee applies only to platforms with IEEE 754 floats.
+
+### Fixes
+* UDL declaration inside Catch2 are now strictly conforming to the standard
+  * `operator "" _a` is UB, `operator ""_a` is fine. Seriously.
+* Fixed `CAPTURE` tests failing to compile in C++23 mode (#2744)
+* Fixed missing include in `catch_message.hpp` (#2758)
+* Fixed `CHECK_ELSE` suppressing failure from uncaught exceptions(#2723)
+
+### Miscellaneous
+* The documentation for specifying which tests to run through commandline has been completely rewritten (#2738)
+* Fixed installation when building Catch2 with meson (#2722, #2742)
+* Fixed `catch_discover_tests` when using custom reporter and `PRE_TEST` discovery mode (#2747)
+* `catch_discover_tests` supports multi-config CMake generator in `PRE_TEST` discovery mode (#2739, #2746)
+
+
+## 3.4.0
+
+### Improvements
+* `VectorEquals` supports elements that provide only `==` and not `!=` (#2648)
+* Catch2 supports compiling with IAR compiler (#2651)
+* Various small internal performance improvements
+* Various small internal compilation time improvements
+* XMLReporter now reports location info for INFO and WARN (#1251)
+  * This bumps up the xml format version to 3
+* Documented that `SKIP` in generator constructor can be used to handle empty  generator (#1593)
+* Added experimental static analysis support to `TEST_CASE` and `SECTION` macros (#2681)
+  * The two macros are redefined in a way that helps the SA tools reason about the possible paths through a test case with sections.
+  * The support is controlled by the `CATCH_CONFIG_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT` option and autodetects clang-tidy and Coverity.
+* `*_THROWS`, `*_THROWS_AS`, etc now suppress warning coming from `__attribute__((warn_unused_result))` on GCC  (#2691)
+  * Unlike plain `[[nodiscard]]`, this warning is not silenced by void cast. WTF GCC?
+
+### Fixes
+* Fixed `assertionStarting` events being sent after the expr is evaluated (#2678)
+* Errors in `TEST_CASE` tags are now reported nicely (#2650)
+
+### Miscellaneous
+* Bunch of improvements to `catch_discover_tests`
+  * Added DISCOVERY_MODE option, so the discovery can happen either post build or pre-run.
+  * Fixed handling of semicolons and backslashes in test names (#2674, #2676)
+* meson build can disable building tests (#2693)
+* meson build properly sets meson version 0.54.1 as the minimal supported version (#2688)
+
+
 ## 3.3.2
 
 ### Improvements
@@ -149,7 +214,7 @@
 
 ### Fixes
 * Cleaned out some warnings and static analysis issues
-  * Suppressed `-Wcomma` warning rarely occuring in templated test cases (#2543)
+  * Suppressed `-Wcomma` warning rarely occurring in templated test cases (#2543)
   * Constified implementation details in `INFO` (#2564)
   * Made `MatcherGenericBase` copy constructor const (#2566)
 * Fixed serialization of test filters so the output roundtrips
@@ -352,7 +417,7 @@ v3 releases.
 * Added `STATIC_CHECK` macro, similar to `STATIC_REQUIRE` (#2318)
   * When deferred tu runtime, it behaves like `CHECK`, and not like `REQUIRE`.
 * You can have multiple tests with the same name, as long as other parts of the test identity differ (#1915, #1999, #2175)
-  * Test identity includes test's name, test's tags and and test's class name if applicable.
+  * Test identity includes test's name, test's tags and test's class name if applicable.
 * Added new warning, `UnmatchedTestSpec`, to error on test specs with no matching tests
 * The `-w`, `--warn` warning flags can now be provided multiple times to enable multiple warnings
 * The case-insensitive handling of tags is now more reliable and takes up less memory
@@ -517,7 +582,7 @@ v3 releases.
   * The `SECTION`(s) before the `GENERATE` will not be run multiple times, the following ones will.
 * Added `-D`/`--min-duration` command line flag (#1910)
   * If a test takes longer to finish than the provided value, its name and duration will be printed.
-  * This flag is overriden by setting `-d`/`--duration`.
+  * This flag is overridden by setting `-d`/`--duration`.
 
 ### Fixes
 * `TAPReporter` no longer skips successful assertions (#1983)
@@ -585,7 +650,7 @@ v3 releases.
 ### Fixes
 * Fixed computation of benchmarking column widths in ConsoleReporter (#1885, #1886)
 * Suppressed clang-tidy's `cppcoreguidelines-pro-type-vararg` in assertions (#1901)
-  * It was a false positive trigered by the new warning support workaround
+  * It was a false positive triggered by the new warning support workaround
 * Fixed bug in test specification parser handling of OR'd patterns using escaping (#1905)
 
 ### Miscellaneous
@@ -922,7 +987,7 @@ v3 releases.
 
 ### Contrib
 * `ParseAndAddCatchTests` has learned how to use `DISABLED` CTest property (#1452)
-* `ParseAndAddCatchTests` now works when there is a whitspace before the test name (#1493)
+* `ParseAndAddCatchTests` now works when there is a whitespace before the test name (#1493)
 
 
 ### Miscellaneous

docs/reporter-events.md

@@ -96,12 +96,12 @@ void assertionStarting( AssertionInfo const& assertionInfo );
 void assertionEnded( AssertionStats const& assertionStats );
 ```
 
-`assertionStarting` is called after the expression is captured, but before
+The `assertionStarting` event is emitted before the expression in the
-the assertion expression is evaluated. This might seem like a minor
+assertion is captured or evaluated and `assertionEnded` is emitted
-distinction, but what it means is that if you have assertion like
+afterwards. This means that given assertion like `REQUIRE(a + b == c + d)`,
-`REQUIRE( a + b == c + d )`, then what happens is that `a + b` and `c + d`
+Catch2 first emits `assertionStarting` event, then `a + b` and `c + d`
-are evaluated before `assertionStarting` is emitted, while the `==` is
+are evaluated, then their results are captured, the comparison is evaluated,
-evaluated after the event.
+and then `assertionEnded` event is emitted.
 
 
 ## Benchmarking events

docs/reporters.md

@@ -52,7 +52,7 @@ its machine-readable XML output to file `result-junit.xml`, and the
 uses ANSI colour codes for colouring the output.
 
 Using multiple reporters (or one reporter and one-or-more [event
-listeners](event-listener.md#top)) can have surprisingly complex semantics
+listeners](event-listeners.md#top)) can have surprisingly complex semantics
 when using customization points provided to reporters by Catch2, namely
 capturing stdout/stderr from test cases.
 

docs/skipping-passing-failing.md

@@ -9,7 +9,7 @@ In some situations it may not be possible to meaningfully execute a test case,
 for example when the system under test is missing certain hardware capabilities.
 If the required conditions can only be determined at runtime, it often
 doesn't make sense to consider such a test case as either passed or failed,
-because it simply can not run at all.
+because it simply cannot run at all.
 
 To properly express such scenarios, Catch2 provides a way to explicitly
 _skip_ test cases, using the `SKIP` macro:
@@ -84,6 +84,12 @@ exit code, same as it does if no test cases have run. This behaviour can
 be overridden using the [--allow-running-no-tests](command-line.md#no-tests-override)
 flag.
 
+### `SKIP` inside generators
+
+You can also use the `SKIP` macro inside generator's constructor to handle
+cases where the generator is empty, but you do not want to fail the test
+case.
+
 
 ## Passing and failing test cases
 

docs/test-cases-and-sections.md

@@ -231,7 +231,7 @@ TEMPLATE_TEST_CASE( "vectors can be sized and resized", "[vector][template]", in
 
 > [Introduced](https://github.com/catchorg/Catch2/issues/1468) in Catch2 2.6.0.
 
-_template-type1_ through _template-typen_ is list of template template
+_template-type1_ through _template-typen_ is list of template
 types which should be combined with each of _template-arg1_ through
  _template-argm_, resulting in _n * m_ test cases. Inside the test case,
 the resulting type is available under the name of `TestType`.

docs/tostring.md

@@ -75,7 +75,7 @@ CATCH_TRANSLATE_EXCEPTION( MyType const& ex ) {
 
 Enums that already have a `<<` overload for `std::ostream` will convert to strings as expected.
 If you only need to convert enums to strings for test reporting purposes you can provide a `StringMaker` specialisations as any other type.
-However, as a convenience, Catch provides the `REGISTER_ENUM` helper macro that will generate the `StringMaker` specialiation for you with minimal code.
+However, as a convenience, Catch provides the `REGISTER_ENUM` helper macro that will generate the `StringMaker` specialisation for you with minimal code.
 Simply provide it the (qualified) enum name, followed by all the enum values, and you're done!
 
 E.g.

docs/tutorial.md

@@ -119,7 +119,7 @@ This is best explained through an example ([code](../examples/100-Fix-Section.cp
 
 ```c++
 TEST_CASE( "vectors can be sized and resized", "[vector]" ) {
-
+    // This setup will be done 4 times in total, once for each section
     std::vector<int> v( 5 );
 
     REQUIRE( v.size() == 5 );
@@ -152,11 +152,12 @@ TEST_CASE( "vectors can be sized and resized", "[vector]" ) {
 }
 ```
 
-For each `SECTION` the `TEST_CASE` is executed from the start. This means
+For each `SECTION` the `TEST_CASE` is **executed from the start**. This means
 that each section is entered with a freshly constructed vector `v`, that
 we know has size 5 and capacity at least 5, because the two assertions
-are also checked before the section is entered. Each run through a test
+are also checked before the section is entered. This behaviour may not be
-case will execute one, and only one, leaf section.
+ideal for tests where setup is expensive. Each run through a test case will
+execute one, and only one, leaf section.
 
 Section can also be nested, in which case the parent section can be
 entered multiple times, once for each leaf section. Nested sections are

docs/why-catch.md

@@ -30,7 +30,7 @@ So what does Catch2 bring to the party that differentiates it from these? Apart
 * Output is through modular reporter objects. Basic textual and XML reporters are included. Custom reporters can easily be added.
 * JUnit xml output is supported for integration with third-party tools, such as CI servers.
 * A default main() function is provided, but you can supply your own for complete control (e.g. integration into your own test runner GUI).
-* A command line parser is provided and can still be used if you choose to provided your own main() function.
+* A command line parser is provided and can still be used if you choose to provide your own main() function.
 * Alternative assertion macro(s) report failures but don't abort the test case
 * Good set of facilities for floating point comparisons (`Catch::Approx` and full set of matchers)
 * Internal and friendly macros are isolated so name clashes can be managed
@@ -41,8 +41,8 @@ So what does Catch2 bring to the party that differentiates it from these? Apart
 
 ## Who else is using Catch2?
 
-A whole lot of people. According to the 2021 JetBrains C++ ecosystem survey,
+A whole lot of people. According to [the 2022 JetBrains C++ ecosystem survey](https://www.jetbrains.com/lp/devecosystem-2022/cpp/#Which-unit-testing-frameworks-do-you-regularly-use),
-about 11% of C++ programmers use Catch2 for unit testing, making it the
+about 12% of C++ programmers use Catch2 for unit testing, making it the
 second most popular unit testing framework.
 
 You can also take a look at the (incomplete) list of [open source projects](opensource-users.md#top)

examples/010-TestCase.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 010-TestCase.cpp
 // And write tests in the same file:
 #include <catch2/catch_test_macros.hpp>

examples/020-TestCase-1.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 020-TestCase-1.cpp
 
 #include <catch2/catch_test_macros.hpp>

examples/020-TestCase-2.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 020-TestCase-2.cpp
 
 // main() provided by Catch in file 020-TestCase-1.cpp.

examples/030-Asn-Require-Check.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 030-Asn-Require-Check.cpp
 
 // Catch has two natural expression assertion macro's:

examples/100-Fix-Section.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 100-Fix-Section.cpp
 
 // Catch has two ways to express fixtures:

examples/110-Fix-ClassFixture.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 110-Fix-ClassFixture.cpp
 
 // Catch has two ways to express fixtures:

examples/120-Bdd-ScenarioGivenWhenThen.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 120-Bdd-ScenarioGivenWhenThen.cpp
 
 // main() provided by linkage with Catch2WithMain

examples/210-Evt-EventListeners.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 210-Evt-EventListeners.cpp
 
 // Contents:

examples/231-Cfg-OutputStreams.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 231-Cfg-OutputStreams.cpp
 // Show how to replace the streams with a simple custom made streambuf.
 

examples/300-Gen-OwnGenerator.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 300-Gen-OwnGenerator.cpp
 // Shows how to define a custom generator.
 

examples/301-Gen-MapTypeConversion.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 301-Gen-MapTypeConversion.cpp
 // Shows how to use map to modify generator's return type.
 

examples/302-Gen-Table.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 302-Gen-Table.cpp
 // Shows how to use table to run a test many times with different inputs. Lifted from examples on
 // issue #850.
@@ -44,11 +52,11 @@ TEST_CASE("Table allows pre-computed test inputs and outputs", "[example][genera
 
 /* Possible simplifications where less legacy toolchain support is needed:
  *
- * - With libstdc++6 or newer, the make_tuple() calls can be ommitted
+ * - With libstdc++6 or newer, the make_tuple() calls can be omitted
  * (technically C++17 but does not require -std in GCC/Clang). See
  *   https://stackoverflow.com/questions/12436586/tuple-vector-and-initializer-list
  *
- * - In C++17 mode std::tie() and the preceding variable delcarations can be
+ * - In C++17 mode std::tie() and the preceding variable declarations can be
  * replaced by structured bindings: auto [test_input, expected] = GENERATE(
  * table<std::string, size_t>({ ...
  */

examples/310-Gen-VariablesInGenerators.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 310-Gen-VariablesInGenerator.cpp
 // Shows how to use variables when creating generators.
 

examples/311-Gen-CustomCapture.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // 311-Gen-CustomCapture.cpp
 // Shows how to provide custom capture list to the generator expression
 

examples/CMakeLists.txt

@@ -53,7 +53,7 @@ set(ALL_EXAMPLE_TARGETS
 )
 
 foreach( name ${ALL_EXAMPLE_TARGETS} )
-    target_link_libraries( ${name} Catch2 Catch2WithMain )
+    target_link_libraries( ${name} Catch2WithMain )
 endforeach()
 
 

extras/Catch.cmake

@@ -35,8 +35,9 @@ same as the Catch name; see also ``TEST_PREFIX`` and ``TEST_SUFFIX``.
                          [TEST_LIST var]
                          [REPORTER reporter]
                          [OUTPUT_DIR dir]
-                         [OUTPUT_PREFIX prefix}
+                         [OUTPUT_PREFIX prefix]
                          [OUTPUT_SUFFIX suffix]
+                         [DISCOVERY_MODE <POST_BUILD|PRE_TEST>]
     )
 
   ``catch_discover_tests`` sets up a post-build command on the test executable
@@ -123,14 +124,28 @@ same as the Catch name; see also ``TEST_PREFIX`` and ``TEST_SUFFIX``.
     test executable and when the tests are executed themselves. This requires
     cmake/ctest >= 3.22.
 
+  `DISCOVERY_MODE mode``
+    Provides control over when ``catch_discover_tests`` performs test discovery.
+    By default, ``POST_BUILD`` sets up a post-build command to perform test discovery
+    at build time. In certain scenarios, like cross-compiling, this ``POST_BUILD``
+    behavior is not desirable. By contrast, ``PRE_TEST`` delays test discovery until
+    just prior to test execution. This way test discovery occurs in the target environment
+    where the test has a better chance at finding appropriate runtime dependencies.
+
+    ``DISCOVERY_MODE`` defaults to the value of the
+    ``CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE`` variable if it is not passed when
+    calling ``catch_discover_tests``. This provides a mechanism for globally selecting
+    a preferred test discovery behavior without having to modify each call site.
+
 #]=======================================================================]
 
 #------------------------------------------------------------------------------
 function(catch_discover_tests TARGET)
+
   cmake_parse_arguments(
     ""
     ""
-    "TEST_PREFIX;TEST_SUFFIX;WORKING_DIRECTORY;TEST_LIST;REPORTER;OUTPUT_DIR;OUTPUT_PREFIX;OUTPUT_SUFFIX"
+    "TEST_PREFIX;TEST_SUFFIX;WORKING_DIRECTORY;TEST_LIST;REPORTER;OUTPUT_DIR;OUTPUT_PREFIX;OUTPUT_SUFFIX;DISCOVERY_MODE"
     "TEST_SPEC;EXTRA_ARGS;PROPERTIES;DL_PATHS"
     ${ARGN}
   )
@@ -141,55 +156,126 @@ function(catch_discover_tests TARGET)
   if(NOT _TEST_LIST)
     set(_TEST_LIST ${TARGET}_TESTS)
   endif()
-
   if (_DL_PATHS)
     if(${CMAKE_VERSION} VERSION_LESS "3.22.0")
         message(FATAL_ERROR "The DL_PATHS option requires at least cmake 3.22")
     endif()
   endif()
+  if(NOT _DISCOVERY_MODE)
+    if(NOT CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE)
+      set(CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE "POST_BUILD")
+    endif()
+    set(_DISCOVERY_MODE ${CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE})
+  endif()
+  if (NOT _DISCOVERY_MODE MATCHES "^(POST_BUILD|PRE_TEST)$")
+    message(FATAL_ERROR "Unknown DISCOVERY_MODE: ${_DISCOVERY_MODE}")
+  endif()
 
   ## Generate a unique name based on the extra arguments
   string(SHA1 args_hash "${_TEST_SPEC} ${_EXTRA_ARGS} ${_REPORTER} ${_OUTPUT_DIR} ${_OUTPUT_PREFIX} ${_OUTPUT_SUFFIX}")
   string(SUBSTRING ${args_hash} 0 7 args_hash)
 
   # Define rule to generate test list for aforementioned test executable
-  set(ctest_include_file "${CMAKE_CURRENT_BINARY_DIR}/${TARGET}_include-${args_hash}.cmake")
+  set(ctest_file_base "${CMAKE_CURRENT_BINARY_DIR}/${TARGET}-${args_hash}")
-  set(ctest_tests_file "${CMAKE_CURRENT_BINARY_DIR}/${TARGET}_tests-${args_hash}.cmake")
+  set(ctest_include_file "${ctest_file_base}_include.cmake")
+  set(ctest_tests_file "${ctest_file_base}_tests.cmake")
+
   get_property(crosscompiling_emulator
     TARGET ${TARGET}
     PROPERTY CROSSCOMPILING_EMULATOR
   )
-  add_custom_command(
-    TARGET ${TARGET} POST_BUILD
-    BYPRODUCTS "${ctest_tests_file}"
-    COMMAND "${CMAKE_COMMAND}"
-            -D "TEST_TARGET=${TARGET}"
-            -D "TEST_EXECUTABLE=$<TARGET_FILE:${TARGET}>"
-            -D "TEST_EXECUTOR=${crosscompiling_emulator}"
-            -D "TEST_WORKING_DIR=${_WORKING_DIRECTORY}"
-            -D "TEST_SPEC=${_TEST_SPEC}"
-            -D "TEST_EXTRA_ARGS=${_EXTRA_ARGS}"
-            -D "TEST_PROPERTIES=${_PROPERTIES}"
-            -D "TEST_PREFIX=${_TEST_PREFIX}"
-            -D "TEST_SUFFIX=${_TEST_SUFFIX}"
-            -D "TEST_LIST=${_TEST_LIST}"
-            -D "TEST_REPORTER=${_REPORTER}"
-            -D "TEST_OUTPUT_DIR=${_OUTPUT_DIR}"
-            -D "TEST_OUTPUT_PREFIX=${_OUTPUT_PREFIX}"
-            -D "TEST_OUTPUT_SUFFIX=${_OUTPUT_SUFFIX}"
-            -D "TEST_DL_PATHS=${_DL_PATHS}"
-            -D "CTEST_FILE=${ctest_tests_file}"
-            -P "${_CATCH_DISCOVER_TESTS_SCRIPT}"
-    VERBATIM
-  )
 
-  file(WRITE "${ctest_include_file}"
+  if(_DISCOVERY_MODE STREQUAL "POST_BUILD")
-    "if(EXISTS \"${ctest_tests_file}\")\n"
+    add_custom_command(
-    "  include(\"${ctest_tests_file}\")\n"
+      TARGET ${TARGET} POST_BUILD
-    "else()\n"
+      BYPRODUCTS "${ctest_tests_file}"
-    "  add_test(${TARGET}_NOT_BUILT-${args_hash} ${TARGET}_NOT_BUILT-${args_hash})\n"
+      COMMAND "${CMAKE_COMMAND}"
-    "endif()\n"
+              -D "TEST_TARGET=${TARGET}"
-  )
+              -D "TEST_EXECUTABLE=$<TARGET_FILE:${TARGET}>"
+              -D "TEST_EXECUTOR=${crosscompiling_emulator}"
+              -D "TEST_WORKING_DIR=${_WORKING_DIRECTORY}"
+              -D "TEST_SPEC=${_TEST_SPEC}"
+              -D "TEST_EXTRA_ARGS=${_EXTRA_ARGS}"
+              -D "TEST_PROPERTIES=${_PROPERTIES}"
+              -D "TEST_PREFIX=${_TEST_PREFIX}"
+              -D "TEST_SUFFIX=${_TEST_SUFFIX}"
+              -D "TEST_LIST=${_TEST_LIST}"
+              -D "TEST_REPORTER=${_REPORTER}"
+              -D "TEST_OUTPUT_DIR=${_OUTPUT_DIR}"
+              -D "TEST_OUTPUT_PREFIX=${_OUTPUT_PREFIX}"
+              -D "TEST_OUTPUT_SUFFIX=${_OUTPUT_SUFFIX}"
+              -D "TEST_DL_PATHS=${_DL_PATHS}"
+              -D "CTEST_FILE=${ctest_tests_file}"
+              -P "${_CATCH_DISCOVER_TESTS_SCRIPT}"
+      VERBATIM
+    )
+
+    file(WRITE "${ctest_include_file}"
+      "if(EXISTS \"${ctest_tests_file}\")\n"
+      "  include(\"${ctest_tests_file}\")\n"
+      "else()\n"
+      "  add_test(${TARGET}_NOT_BUILT-${args_hash} ${TARGET}_NOT_BUILT-${args_hash})\n"
+      "endif()\n"
+    )
+
+  elseif(_DISCOVERY_MODE STREQUAL "PRE_TEST")
+
+    get_property(GENERATOR_IS_MULTI_CONFIG GLOBAL
+        PROPERTY GENERATOR_IS_MULTI_CONFIG
+    )
+
+    if(GENERATOR_IS_MULTI_CONFIG)
+      set(ctest_tests_file "${ctest_file_base}_tests-$<CONFIG>.cmake")
+    endif()
+
+    string(CONCAT ctest_include_content
+      "if(EXISTS \"$<TARGET_FILE:${TARGET}>\")"                                    "\n"
+      "  if(NOT EXISTS \"${ctest_tests_file}\" OR"                                 "\n"
+      "     NOT \"${ctest_tests_file}\" IS_NEWER_THAN \"$<TARGET_FILE:${TARGET}>\" OR\n"
+      "     NOT \"${ctest_tests_file}\" IS_NEWER_THAN \"\${CMAKE_CURRENT_LIST_FILE}\")\n"
+      "    include(\"${_CATCH_DISCOVER_TESTS_SCRIPT}\")"                           "\n"
+      "    catch_discover_tests_impl("                                             "\n"
+      "      TEST_EXECUTABLE"        " [==[" "$<TARGET_FILE:${TARGET}>"   "]==]"   "\n"
+      "      TEST_EXECUTOR"          " [==[" "${crosscompiling_emulator}" "]==]"   "\n"
+      "      TEST_WORKING_DIR"       " [==[" "${_WORKING_DIRECTORY}"      "]==]"   "\n"
+      "      TEST_SPEC"              " [==[" "${_TEST_SPEC}"              "]==]"   "\n"
+      "      TEST_EXTRA_ARGS"        " [==[" "${_EXTRA_ARGS}"             "]==]"   "\n"
+      "      TEST_PROPERTIES"        " [==[" "${_PROPERTIES}"             "]==]"   "\n"
+      "      TEST_PREFIX"            " [==[" "${_TEST_PREFIX}"            "]==]"   "\n"
+      "      TEST_SUFFIX"            " [==[" "${_TEST_SUFFIX}"            "]==]"   "\n"
+      "      TEST_LIST"              " [==[" "${_TEST_LIST}"              "]==]"   "\n"
+      "      TEST_REPORTER"          " [==[" "${_REPORTER}"               "]==]"   "\n"
+      "      TEST_OUTPUT_DIR"        " [==[" "${_OUTPUT_DIR}"             "]==]"   "\n"
+      "      TEST_OUTPUT_PREFIX"     " [==[" "${_OUTPUT_PREFIX}"          "]==]"   "\n"
+      "      TEST_OUTPUT_SUFFIX"     " [==[" "${_OUTPUT_SUFFIX}"          "]==]"   "\n"
+      "      CTEST_FILE"             " [==[" "${ctest_tests_file}"        "]==]"   "\n"
+      "      TEST_DL_PATHS"          " [==[" "${_DL_PATHS}"               "]==]"   "\n"
+      "      CTEST_FILE"             " [==[" "${CTEST_FILE}"              "]==]"   "\n"
+      "    )"                                                                      "\n"
+      "  endif()"                                                                  "\n"
+      "  include(\"${ctest_tests_file}\")"                                         "\n"
+      "else()"                                                                     "\n"
+      "  add_test(${TARGET}_NOT_BUILT ${TARGET}_NOT_BUILT)"                        "\n"
+      "endif()"                                                                    "\n"
+    )
+
+    if(GENERATOR_IS_MULTI_CONFIG)
+      foreach(_config ${CMAKE_CONFIGURATION_TYPES})
+        file(GENERATE OUTPUT "${ctest_file_base}_include-${_config}.cmake" CONTENT "${ctest_include_content}" CONDITION $<CONFIG:${_config}>)
+      endforeach()
+      string(CONCAT ctest_include_multi_content
+        "if(NOT CTEST_CONFIGURATION_TYPE)"                                              "\n"
+        "  message(\"No configuration for testing specified, use '-C <cfg>'.\")"        "\n"
+        "else()"                                                                        "\n"
+        "  include(\"${ctest_file_base}_include-\${CTEST_CONFIGURATION_TYPE}.cmake\")"  "\n"
+        "endif()"                                                                       "\n"
+      )
+      file(GENERATE OUTPUT "${ctest_include_file}" CONTENT "${ctest_include_multi_content}")
+    else()
+      file(GENERATE OUTPUT "${ctest_file_base}_include.cmake" CONTENT "${ctest_include_content}")
+      file(WRITE "${ctest_include_file}" "include(\"${ctest_file_base}_include.cmake\")")
+    endif()
+  endif()
 
   if(NOT ${CMAKE_VERSION} VERSION_LESS "3.10.0")
     # Add discovered tests to directory TEST_INCLUDE_FILES
@@ -204,9 +290,7 @@ function(catch_discover_tests TARGET)
         PROPERTY TEST_INCLUDE_FILE "${ctest_include_file}"
       )
     else()
-      message(FATAL_ERROR
+      message(FATAL_ERROR "Cannot set more than one TEST_INCLUDE_FILE")
-        "Cannot set more than one TEST_INCLUDE_FILE"
-      )
     endif()
   endif()
 

extras/CatchAddTests.cmake

@@ -1,28 +1,6 @@
 # Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
 # file Copyright.txt or https://cmake.org/licensing for details.
 
-set(prefix "${TEST_PREFIX}")
-set(suffix "${TEST_SUFFIX}")
-set(spec ${TEST_SPEC})
-set(extra_args ${TEST_EXTRA_ARGS})
-set(properties ${TEST_PROPERTIES})
-set(reporter ${TEST_REPORTER})
-set(output_dir ${TEST_OUTPUT_DIR})
-set(output_prefix ${TEST_OUTPUT_PREFIX})
-set(output_suffix ${TEST_OUTPUT_SUFFIX})
-set(dl_paths ${TEST_DL_PATHS})
-set(script)
-set(suite)
-set(tests)
-
-if(WIN32)
-  set(dl_paths_variable_name PATH)
-elseif(APPLE)
-  set(dl_paths_variable_name DYLD_LIBRARY_PATH)
-else()
-  set(dl_paths_variable_name LD_LIBRARY_PATH)
-endif()
-
 function(add_command NAME)
   set(_args "")
   # use ARGV* instead of ARGN, because ARGN splits arrays into multiple arguments
@@ -38,119 +16,177 @@ function(add_command NAME)
   set(script "${script}${NAME}(${_args})\n" PARENT_SCOPE)
 endfunction()
 
-# Run test executable to get list of available tests
+function(catch_discover_tests_impl)
-if(NOT EXISTS "${TEST_EXECUTABLE}")
+
-  message(FATAL_ERROR
+  cmake_parse_arguments(
-    "Specified test executable '${TEST_EXECUTABLE}' does not exist"
+    ""
+    ""
+    "TEST_EXECUTABLE;TEST_WORKING_DIR;TEST_DL_PATHS;TEST_OUTPUT_DIR;TEST_OUTPUT_PREFIX;TEST_OUTPUT_SUFFIX;TEST_PREFIX;TEST_REPORTER;TEST_SPEC;TEST_SUFFIX;TEST_LIST;CTEST_FILE"
+    "TEST_EXTRA_ARGS;TEST_PROPERTIES;TEST_EXECUTOR"
+    ${ARGN}
   )
-endif()
 
-if(dl_paths)
+  set(prefix "${_TEST_PREFIX}")
-  cmake_path(CONVERT "${dl_paths}" TO_NATIVE_PATH_LIST paths)
+  set(suffix "${_TEST_SUFFIX}")
-  set(ENV{${dl_paths_variable_name}} "${paths}")
+  set(spec ${_TEST_SPEC})
-endif()
+  set(extra_args ${_TEST_EXTRA_ARGS})
+  set(properties ${_TEST_PROPERTIES})
+  set(reporter ${_TEST_REPORTER})
+  set(output_dir ${_TEST_OUTPUT_DIR})
+  set(output_prefix ${_TEST_OUTPUT_PREFIX})
+  set(output_suffix ${_TEST_OUTPUT_SUFFIX})
+  set(dl_paths ${_TEST_DL_PATHS})
+  set(script)
+  set(suite)
+  set(tests)
 
-execute_process(
+  if(WIN32)
-  COMMAND ${TEST_EXECUTOR} "${TEST_EXECUTABLE}" ${spec} --list-tests --verbosity quiet
+    set(dl_paths_variable_name PATH)
-  OUTPUT_VARIABLE output
+  elseif(APPLE)
-  RESULT_VARIABLE result
+    set(dl_paths_variable_name DYLD_LIBRARY_PATH)
-  WORKING_DIRECTORY "${TEST_WORKING_DIR}"
+  else()
-)
+    set(dl_paths_variable_name LD_LIBRARY_PATH)
-if(NOT ${result} EQUAL 0)
-  message(FATAL_ERROR
-    "Error running test executable '${TEST_EXECUTABLE}':\n"
-    "  Result: ${result}\n"
-    "  Output: ${output}\n"
-  )
-endif()
-
-string(REPLACE "\n" ";" output "${output}")
-
-# Run test executable to get list of available reporters
-execute_process(
-  COMMAND ${TEST_EXECUTOR} "${TEST_EXECUTABLE}" ${spec} --list-reporters
-  OUTPUT_VARIABLE reporters_output
-  RESULT_VARIABLE reporters_result
-  WORKING_DIRECTORY "${TEST_WORKING_DIR}"
-)
-if(NOT ${reporters_result} EQUAL 0)
-  message(FATAL_ERROR
-    "Error running test executable '${TEST_EXECUTABLE}':\n"
-    "  Result: ${reporters_result}\n"
-    "  Output: ${reporters_output}\n"
-  )
-endif()
-string(FIND "${reporters_output}" "${reporter}" reporter_is_valid)
-if(reporter AND ${reporter_is_valid} EQUAL -1)
-  message(FATAL_ERROR
-    "\"${reporter}\" is not a valid reporter!\n"
-  )
-endif()
-
-# Prepare reporter
-if(reporter)
-  set(reporter_arg "--reporter ${reporter}")
-endif()
-
-# Prepare output dir
-if(output_dir AND NOT IS_ABSOLUTE ${output_dir})
-  set(output_dir "${TEST_WORKING_DIR}/${output_dir}")
-  if(NOT EXISTS ${output_dir})
-    file(MAKE_DIRECTORY ${output_dir})
   endif()
-endif()
 
-if(dl_paths)
+  # Run test executable to get list of available tests
-  foreach(path ${dl_paths})
+  if(NOT EXISTS "${_TEST_EXECUTABLE}")
-    cmake_path(NATIVE_PATH path native_path)
+    message(FATAL_ERROR
-    list(APPEND environment_modifications "${dl_paths_variable_name}=path_list_prepend:${native_path}")
+      "Specified test executable '${_TEST_EXECUTABLE}' does not exist"
+    )
+  endif()
+
+  if(dl_paths)
+    cmake_path(CONVERT "${dl_paths}" TO_NATIVE_PATH_LIST paths)
+    set(ENV{${dl_paths_variable_name}} "${paths}")
+  endif()
+
+  execute_process(
+    COMMAND ${_TEST_EXECUTOR} "${_TEST_EXECUTABLE}" ${spec} --list-tests --verbosity quiet
+    OUTPUT_VARIABLE output
+    RESULT_VARIABLE result
+    WORKING_DIRECTORY "${_TEST_WORKING_DIR}"
+  )
+  if(NOT ${result} EQUAL 0)
+    message(FATAL_ERROR
+      "Error running test executable '${_TEST_EXECUTABLE}':\n"
+      "  Result: ${result}\n"
+      "  Output: ${output}\n"
+    )
+  endif()
+
+  # Make sure to escape ; (semicolons) in test names first, because
+  # that'd break the foreach loop for "Parse output" later and create
+  # wrongly splitted and thus failing test cases (false positives)
+  string(REPLACE ";" "\;" output "${output}")
+  string(REPLACE "\n" ";" output "${output}")
+
+  # Prepare reporter
+  if(reporter)
+    set(reporter_arg "--reporter ${reporter}")
+
+    # Run test executable to check whether reporter is available
+    # note that the use of --list-reporters is not the important part,
+    # we only want to check whether the execution succeeds with ${reporter_arg}
+    execute_process(
+      COMMAND ${_TEST_EXECUTOR} "${_TEST_EXECUTABLE}" ${spec} ${reporter_arg} --list-reporters
+      OUTPUT_VARIABLE reporter_check_output
+      RESULT_VARIABLE reporter_check_result
+      WORKING_DIRECTORY "${_TEST_WORKING_DIR}"
+    )
+    if(${reporter_check_result} EQUAL 255)
+      message(FATAL_ERROR
+        "\"${reporter}\" is not a valid reporter!\n"
+      )
+    elseif(NOT ${reporter_check_result} EQUAL 0)
+      message(FATAL_ERROR
+        "Error running test executable '${_TEST_EXECUTABLE}':\n"
+        "  Result: ${reporter_check_result}\n"
+        "  Output: ${reporter_check_output}\n"
+      )
+    endif()
+  endif()
+
+  # Prepare output dir
+  if(output_dir AND NOT IS_ABSOLUTE ${output_dir})
+    set(output_dir "${_TEST_WORKING_DIR}/${output_dir}")
+    if(NOT EXISTS ${output_dir})
+      file(MAKE_DIRECTORY ${output_dir})
+    endif()
+  endif()
+
+  if(dl_paths)
+    foreach(path ${dl_paths})
+      cmake_path(NATIVE_PATH path native_path)
+      list(APPEND environment_modifications "${dl_paths_variable_name}=path_list_prepend:${native_path}")
+    endforeach()
+  endif()
+
+  # Parse output
+  foreach(line ${output})
+    set(test "${line}")
+    # Escape characters in test case names that would be parsed by Catch2
+    # Note that the \ escaping must happen FIRST! Do not change the order.
+    set(test_name "${test}")
+    foreach(char \\ , [ ])
+      string(REPLACE ${char} "\\${char}" test_name "${test_name}")
+    endforeach(char)
+    # ...add output dir
+    if(output_dir)
+      string(REGEX REPLACE "[^A-Za-z0-9_]" "_" test_name_clean "${test_name}")
+      set(output_dir_arg "--out ${output_dir}/${output_prefix}${test_name_clean}${output_suffix}")
+    endif()
+
+    # ...and add to script
+    add_command(add_test
+      "${prefix}${test}${suffix}"
+      ${_TEST_EXECUTOR}
+      "${_TEST_EXECUTABLE}"
+      "${test_name}"
+      ${extra_args}
+      "${reporter_arg}"
+      "${output_dir_arg}"
+    )
+    add_command(set_tests_properties
+      "${prefix}${test}${suffix}"
+      PROPERTIES
+      WORKING_DIRECTORY "${_TEST_WORKING_DIR}"
+      ${properties}
+    )
+
+    if(environment_modifications)
+      add_command(set_tests_properties
+        "${prefix}${test}${suffix}"
+        PROPERTIES
+        ENVIRONMENT_MODIFICATION "${environment_modifications}")
+    endif()
+
+    list(APPEND tests "${prefix}${test}${suffix}")
   endforeach()
+
+  # Create a list of all discovered tests, which users may use to e.g. set
+  # properties on the tests
+  add_command(set ${_TEST_LIST} ${tests})
+
+  # Write CTest script
+  file(WRITE "${_CTEST_FILE}" "${script}")
+endfunction()
+
+if(CMAKE_SCRIPT_MODE_FILE)
+  catch_discover_tests_impl(
+    TEST_EXECUTABLE ${TEST_EXECUTABLE}
+    TEST_EXECUTOR ${TEST_EXECUTOR}
+    TEST_WORKING_DIR ${TEST_WORKING_DIR}
+    TEST_SPEC ${TEST_SPEC}
+    TEST_EXTRA_ARGS ${TEST_EXTRA_ARGS}
+    TEST_PROPERTIES ${TEST_PROPERTIES}
+    TEST_PREFIX ${TEST_PREFIX}
+    TEST_SUFFIX ${TEST_SUFFIX}
+    TEST_LIST ${TEST_LIST}
+    TEST_REPORTER ${TEST_REPORTER}
+    TEST_OUTPUT_DIR ${TEST_OUTPUT_DIR}
+    TEST_OUTPUT_PREFIX ${TEST_OUTPUT_PREFIX}
+    TEST_OUTPUT_SUFFIX ${TEST_OUTPUT_SUFFIX}
+    TEST_DL_PATHS ${TEST_DL_PATHS}
+    CTEST_FILE ${CTEST_FILE}
+  )
 endif()
-
-# Parse output
-foreach(line ${output})
-  set(test ${line})
-  # Escape characters in test case names that would be parsed by Catch2
-  set(test_name ${test})
-  foreach(char , [ ])
-    string(REPLACE ${char} "\\${char}" test_name ${test_name})
-  endforeach(char)
-  # ...add output dir
-  if(output_dir)
-    string(REGEX REPLACE "[^A-Za-z0-9_]" "_" test_name_clean ${test_name})
-    set(output_dir_arg "--out ${output_dir}/${output_prefix}${test_name_clean}${output_suffix}")
-  endif()
-  
-  # ...and add to script
-  add_command(add_test
-    "${prefix}${test}${suffix}"
-    ${TEST_EXECUTOR}
-    "${TEST_EXECUTABLE}"
-    "${test_name}"
-    ${extra_args}
-    "${reporter_arg}"
-    "${output_dir_arg}"
-  )
-  add_command(set_tests_properties
-    "${prefix}${test}${suffix}"
-    PROPERTIES
-    WORKING_DIRECTORY "${TEST_WORKING_DIR}"
-    ${properties}
-  )
-
-   if(environment_modifications)
-     add_command(set_tests_properties
-       "${prefix}${test}${suffix}"
-       PROPERTIES
-       ENVIRONMENT_MODIFICATION "${environment_modifications}")
-   endif()
-
-  list(APPEND tests "${prefix}${test}${suffix}")
-endforeach()
-
-# Create a list of all discovered tests, which users may use to e.g. set
-# properties on the tests
-add_command(set ${TEST_LIST} ${tests})
-
-# Write CTest script
-file(WRITE "${CTEST_FILE}" "${script}")

fuzzing/NullOStream.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 #include "NullOStream.h"
 
 void NullOStream::avoidOutOfLineVirtualCompilerWarning()

fuzzing/NullOStream.h

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 #pragma once
 
 #include <ostream>

fuzzing/fuzz_TestSpecParser.cpp

@@ -1,4 +1,10 @@
-//License: Boost 1.0
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
 //By Paul Dreik 2020
 
 #include <catch2/internal/catch_test_spec_parser.hpp>

fuzzing/fuzz_XmlWriter.cpp

@@ -1,4 +1,10 @@
-//License: Boost 1.0
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
 //By Paul Dreik 2020
 
 #include <catch2/internal/catch_xmlwriter.hpp>

fuzzing/fuzz_textflow.cpp

@@ -1,4 +1,10 @@
-//License: Boost 1.0
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
 //By Paul Dreik 2020
 
 #include <catch2/internal/catch_textflow.hpp>

meson.build

@@ -8,10 +8,12 @@
 project(
   'catch2',
   'cpp',
-  version: '3.3.2', # CML version placeholder, don't delete
+  version: '3.5.0', # CML version placeholder, don't delete
   license: 'BSL-1.0',
-  meson_version: '>=0.50.0',
+  meson_version: '>=0.54.1',
 )
 
 subdir('src/catch2')
-subdir('tests')
+if get_option('tests')
+  subdir('tests')
+endif

meson_options.txt

@@ -0,0 +1 @@
+option('tests', type: 'boolean', value: true, description: 'Build the unit tests')

src/CMakeLists.txt

@@ -21,6 +21,8 @@ set(BENCHMARK_HEADERS
   ${SOURCES_DIR}/benchmark/catch_sample_analysis.hpp
   ${SOURCES_DIR}/benchmark/detail/catch_analyse.hpp
   ${SOURCES_DIR}/benchmark/detail/catch_benchmark_function.hpp
+  ${SOURCES_DIR}/benchmark/detail/catch_benchmark_stats.hpp
+  ${SOURCES_DIR}/benchmark/detail/catch_benchmark_stats_fwd.hpp
   ${SOURCES_DIR}/benchmark/detail/catch_complete_invoke.hpp
   ${SOURCES_DIR}/benchmark/detail/catch_estimate_clock.hpp
   ${SOURCES_DIR}/benchmark/detail/catch_measure.hpp
@@ -31,6 +33,7 @@ set(BENCHMARK_HEADERS
 )
 set(BENCHMARK_SOURCES
   ${SOURCES_DIR}/benchmark/catch_chronometer.cpp
+  ${SOURCES_DIR}/benchmark/detail/catch_analyse.cpp
   ${SOURCES_DIR}/benchmark/detail/catch_benchmark_function.cpp
   ${SOURCES_DIR}/benchmark/detail/catch_run_for_at_least.cpp
   ${SOURCES_DIR}/benchmark/detail/catch_stats.cpp
@@ -71,6 +74,7 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_compiler_capabilities.hpp
   ${SOURCES_DIR}/internal/catch_config_android_logwrite.hpp
   ${SOURCES_DIR}/internal/catch_config_counter.hpp
+  ${SOURCES_DIR}/internal/catch_config_static_analysis_support.hpp
   ${SOURCES_DIR}/internal/catch_config_uncaught_exceptions.hpp
   ${SOURCES_DIR}/internal/catch_config_wchar.hpp
   ${SOURCES_DIR}/internal/catch_console_colour.hpp
@@ -89,6 +93,7 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_getenv.hpp
   ${SOURCES_DIR}/internal/catch_istream.hpp
   ${SOURCES_DIR}/internal/catch_is_permutation.hpp
+  ${SOURCES_DIR}/internal/catch_jsonwriter.hpp
   ${SOURCES_DIR}/internal/catch_lazy_expr.hpp
   ${SOURCES_DIR}/internal/catch_leak_detector.hpp
   ${SOURCES_DIR}/internal/catch_list.hpp
@@ -104,6 +109,8 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_polyfills.hpp
   ${SOURCES_DIR}/internal/catch_preprocessor.hpp
   ${SOURCES_DIR}/internal/catch_preprocessor_remove_parens.hpp
+  ${SOURCES_DIR}/internal/catch_random_floating_point_helpers.hpp
+  ${SOURCES_DIR}/internal/catch_random_integer_helpers.hpp
   ${SOURCES_DIR}/internal/catch_random_number_generator.hpp
   ${SOURCES_DIR}/internal/catch_random_seed_generation.hpp
   ${SOURCES_DIR}/internal/catch_reporter_registry.hpp
@@ -128,10 +135,13 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_test_failure_exception.hpp
   ${SOURCES_DIR}/internal/catch_test_macro_impl.hpp
   ${SOURCES_DIR}/internal/catch_test_registry.hpp
+  ${SOURCES_DIR}/internal/catch_test_run_info.hpp
   ${SOURCES_DIR}/internal/catch_test_spec_parser.hpp
   ${SOURCES_DIR}/internal/catch_textflow.hpp
   ${SOURCES_DIR}/internal/catch_to_string.hpp
   ${SOURCES_DIR}/internal/catch_uncaught_exceptions.hpp
+  ${SOURCES_DIR}/internal/catch_uniform_floating_point_distribution.hpp
+  ${SOURCES_DIR}/internal/catch_uniform_integer_distribution.hpp
   ${SOURCES_DIR}/internal/catch_unique_name.hpp
   ${SOURCES_DIR}/internal/catch_unique_ptr.hpp
   ${SOURCES_DIR}/internal/catch_void_type.hpp
@@ -153,6 +163,7 @@ set(IMPL_SOURCES
   ${SOURCES_DIR}/catch_timer.cpp
   ${SOURCES_DIR}/catch_tostring.cpp
   ${SOURCES_DIR}/catch_totals.cpp
+  ${SOURCES_DIR}/catch_translate_exception.cpp
   ${SOURCES_DIR}/catch_version.cpp
   ${SOURCES_DIR}/internal/catch_assertion_handler.cpp
   ${SOURCES_DIR}/internal/catch_case_insensitive_comparisons.cpp
@@ -171,6 +182,7 @@ set(IMPL_SOURCES
   ${SOURCES_DIR}/internal/catch_floating_point_helpers.cpp
   ${SOURCES_DIR}/internal/catch_getenv.cpp
   ${SOURCES_DIR}/internal/catch_istream.cpp
+  ${SOURCES_DIR}/internal/catch_jsonwriter.cpp
   ${SOURCES_DIR}/internal/catch_lazy_expr.cpp
   ${SOURCES_DIR}/internal/catch_leak_detector.cpp
   ${SOURCES_DIR}/internal/catch_list.cpp
@@ -216,8 +228,8 @@ set(INTERFACE_HEADERS
   ${SOURCES_DIR}/interfaces/catch_interfaces_registry_hub.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_reporter.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_reporter_factory.hpp
-  ${SOURCES_DIR}/interfaces/catch_interfaces_reporter_registry.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_tag_alias_registry.hpp
+  ${SOURCES_DIR}/interfaces/catch_interfaces_test_invoker.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_testcase.hpp
 )
 set(INTERFACE_SOURCES
@@ -228,7 +240,6 @@ set(INTERFACE_SOURCES
   ${SOURCES_DIR}/interfaces/catch_interfaces_registry_hub.cpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_reporter.cpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_reporter_factory.cpp
-  ${SOURCES_DIR}/interfaces/catch_interfaces_reporter_registry.cpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_testcase.cpp
 )
 set(INTERFACE_FILES ${INTERFACE_HEADERS} ${INTERFACE_SOURCES})
@@ -284,6 +295,7 @@ set(REPORTER_HEADERS
   ${SOURCES_DIR}/reporters/catch_reporter_cumulative_base.hpp
   ${SOURCES_DIR}/reporters/catch_reporter_event_listener.hpp
   ${SOURCES_DIR}/reporters/catch_reporter_helpers.hpp
+  ${SOURCES_DIR}/reporters/catch_reporter_json.hpp
   ${SOURCES_DIR}/reporters/catch_reporter_junit.hpp
   ${SOURCES_DIR}/reporters/catch_reporter_multi.hpp
   ${SOURCES_DIR}/reporters/catch_reporter_registrars.hpp
@@ -302,6 +314,7 @@ set(REPORTER_SOURCES
   ${SOURCES_DIR}/reporters/catch_reporter_cumulative_base.cpp
   ${SOURCES_DIR}/reporters/catch_reporter_event_listener.cpp
   ${SOURCES_DIR}/reporters/catch_reporter_helpers.cpp
+  ${SOURCES_DIR}/reporters/catch_reporter_json.cpp
   ${SOURCES_DIR}/reporters/catch_reporter_junit.cpp
   ${SOURCES_DIR}/reporters/catch_reporter_multi.cpp
   ${SOURCES_DIR}/reporters/catch_reporter_registrars.cpp
@@ -335,7 +348,9 @@ source_group("generated headers"
 )
 
 add_library(Catch2 ${ALL_FILES})
-add_build_reproducibility_settings(Catch2)
+if (CATCH_ENABLE_REPRODUCIBLE_BUILD)
+    add_build_reproducibility_settings(Catch2)
+endif()
 add_library(Catch2::Catch2 ALIAS Catch2)
 
 if (ANDROID)
@@ -388,7 +403,9 @@ target_include_directories(Catch2
 add_library(Catch2WithMain
     ${SOURCES_DIR}/internal/catch_main.cpp
 )
-add_build_reproducibility_settings(Catch2WithMain)
+if (CATCH_ENABLE_REPRODUCIBLE_BUILD)
+    add_build_reproducibility_settings(Catch2WithMain)
+endif()
 add_library(Catch2::Catch2WithMain ALIAS Catch2WithMain)
 target_link_libraries(Catch2WithMain PUBLIC Catch2)
 set_target_properties(Catch2WithMain

src/catch2/benchmark/catch_benchmark.hpp

@@ -10,26 +10,28 @@
 #ifndef CATCH_BENCHMARK_HPP_INCLUDED
 #define CATCH_BENCHMARK_HPP_INCLUDED
 
-#include <catch2/interfaces/catch_interfaces_config.hpp>
+#include <catch2/catch_user_config.hpp>
 #include <catch2/internal/catch_compiler_capabilities.hpp>
 #include <catch2/internal/catch_context.hpp>
-#include <catch2/interfaces/catch_interfaces_reporter.hpp>
-#include <catch2/internal/catch_unique_name.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
-#include <catch2/benchmark/catch_chronometer.hpp>
+#include <catch2/internal/catch_test_failure_exception.hpp>
+#include <catch2/internal/catch_unique_name.hpp>
+#include <catch2/interfaces/catch_interfaces_capture.hpp>
+#include <catch2/interfaces/catch_interfaces_config.hpp>
+#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+#include <catch2/benchmark/detail/catch_benchmark_stats.hpp>
 #include <catch2/benchmark/catch_clock.hpp>
 #include <catch2/benchmark/catch_environment.hpp>
 #include <catch2/benchmark/catch_execution_plan.hpp>
 #include <catch2/benchmark/detail/catch_estimate_clock.hpp>
-#include <catch2/benchmark/detail/catch_complete_invoke.hpp>
 #include <catch2/benchmark/detail/catch_analyse.hpp>
 #include <catch2/benchmark/detail/catch_benchmark_function.hpp>
 #include <catch2/benchmark/detail/catch_run_for_at_least.hpp>
 
 #include <algorithm>
-#include <functional>
+#include <chrono>
+#include <exception>
 #include <string>
-#include <vector>
 #include <cmath>
 
 namespace Catch {
@@ -43,16 +45,18 @@ namespace Catch {
                 : fun(CATCH_MOVE(func)), name(CATCH_MOVE(benchmarkName)) {}
 
             template <typename Clock>
-            ExecutionPlan<FloatDuration<Clock>> prepare(const IConfig &cfg, Environment<FloatDuration<Clock>> env) const {
+            ExecutionPlan prepare(const IConfig &cfg, Environment env) const {
                 auto min_time = env.clock_resolution.mean * Detail::minimum_ticks;
                 auto run_time = std::max(min_time, std::chrono::duration_cast<decltype(min_time)>(cfg.benchmarkWarmupTime()));
-                auto&& test = Detail::run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(run_time), 1, fun);
+                auto&& test = Detail::run_for_at_least<Clock>(std::chrono::duration_cast<IDuration>(run_time), 1, fun);
                 int new_iters = static_cast<int>(std::ceil(min_time * test.iterations / test.elapsed));
-                return { new_iters, test.elapsed / test.iterations * new_iters * cfg.benchmarkSamples(), fun, std::chrono::duration_cast<FloatDuration<Clock>>(cfg.benchmarkWarmupTime()), Detail::warmup_iterations };
+                return { new_iters, test.elapsed / test.iterations * new_iters * cfg.benchmarkSamples(), fun, std::chrono::duration_cast<FDuration>(cfg.benchmarkWarmupTime()), Detail::warmup_iterations };
             }
 
             template <typename Clock = default_clock>
             void run() {
+                static_assert( Clock::is_steady,
+                               "Benchmarking clock should be steady" );
                 auto const* cfg = getCurrentContext().getConfig();
 
                 auto env = Detail::measure_environment<Clock>();
@@ -79,10 +83,10 @@ namespace Catch {
                         return plan.template run<Clock>(*cfg, env);
                     });
 
-                    auto analysis = Detail::analyse(*cfg, env, samples.begin(), samples.end());
+                    auto analysis = Detail::analyse(*cfg, samples.data(), samples.data() + samples.size());
-                    BenchmarkStats<FloatDuration<Clock>> stats{ CATCH_MOVE(info), CATCH_MOVE(analysis.samples), analysis.mean, analysis.standard_deviation, analysis.outliers, analysis.outlier_variance };
+                    BenchmarkStats<> stats{ CATCH_MOVE(info), CATCH_MOVE(analysis.samples), analysis.mean, analysis.standard_deviation, analysis.outliers, analysis.outlier_variance };
                     getResultCapture().benchmarkEnded(stats);
-                } CATCH_CATCH_ANON (TestFailureException) {
+                } CATCH_CATCH_ANON (TestFailureException const&) {
                     getResultCapture().benchmarkFailed("Benchmark failed due to failed assertion"_sr);
                 } CATCH_CATCH_ALL{
                     getResultCapture().benchmarkFailed(translateActiveException());

src/catch2/benchmark/catch_benchmark_all.hpp

@@ -33,6 +33,8 @@
 #include <catch2/benchmark/catch_sample_analysis.hpp>
 #include <catch2/benchmark/detail/catch_analyse.hpp>
 #include <catch2/benchmark/detail/catch_benchmark_function.hpp>
+#include <catch2/benchmark/detail/catch_benchmark_stats.hpp>
+#include <catch2/benchmark/detail/catch_benchmark_stats_fwd.hpp>
 #include <catch2/benchmark/detail/catch_complete_invoke.hpp>
 #include <catch2/benchmark/detail/catch_estimate_clock.hpp>
 #include <catch2/benchmark/detail/catch_measure.hpp>

src/catch2/benchmark/catch_chronometer.hpp

@@ -12,7 +12,6 @@
 
 #include <catch2/benchmark/catch_clock.hpp>
 #include <catch2/benchmark/catch_optimizer.hpp>
-#include <catch2/benchmark/detail/catch_complete_invoke.hpp>
 #include <catch2/internal/catch_meta.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 
@@ -33,7 +32,10 @@ namespace Catch {
                 void start() override { started = Clock::now(); }
                 void finish() override { finished = Clock::now(); }
 
-                ClockDuration<Clock> elapsed() const { return finished - started; }
+                IDuration elapsed() const {
+                    return std::chrono::duration_cast<std::chrono::nanoseconds>(
+                        finished - started );
+                }
 
                 TimePoint<Clock> started;
                 TimePoint<Clock> finished;

src/catch2/benchmark/catch_clock.hpp

@@ -11,28 +11,16 @@
 #define CATCH_CLOCK_HPP_INCLUDED
 
 #include <chrono>
-#include <ratio>
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Clock>
+        using IDuration = std::chrono::nanoseconds;
-        using ClockDuration = typename Clock::duration;
+        using FDuration = std::chrono::duration<double, std::nano>;
-        template <typename Clock>
-        using FloatDuration = std::chrono::duration<double, typename Clock::period>;
 
         template <typename Clock>
         using TimePoint = typename Clock::time_point;
 
         using default_clock = std::chrono::steady_clock;
-
-        template <typename Clock>
-        struct now {
-            TimePoint<Clock> operator()() const {
-                return Clock::now();
-            }
-        };
-
-        using fp_seconds = std::chrono::duration<double, std::ratio<1>>;
     } // namespace Benchmark
 } // namespace Catch
 

src/catch2/benchmark/catch_environment.hpp

@@ -15,21 +15,13 @@
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
         struct EnvironmentEstimate {
-            Duration mean;
+            FDuration mean;
             OutlierClassification outliers;
-
-            template <typename Duration2>
-            operator EnvironmentEstimate<Duration2>() const {
-                return { mean, outliers };
-            }
         };
-        template <typename Clock>
         struct Environment {
-            using clock_type = Clock;
+            EnvironmentEstimate clock_resolution;
-            EnvironmentEstimate<FloatDuration<Clock>> clock_resolution;
+            EnvironmentEstimate clock_cost;
-            EnvironmentEstimate<FloatDuration<Clock>> clock_cost;
         };
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/catch_estimate.hpp

@@ -12,17 +12,12 @@
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
+        template <typename Type>
         struct Estimate {
-            Duration point;
+            Type point;
-            Duration lower_bound;
+            Type lower_bound;
-            Duration upper_bound;
+            Type upper_bound;
             double confidence_interval;
-
-            template <typename Duration2>
-            operator Estimate<Duration2>() const {
-                return { point, lower_bound, upper_bound, confidence_interval };
-            }
         };
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/catch_execution_plan.hpp

@@ -17,38 +17,38 @@
 #include <catch2/benchmark/detail/catch_repeat.hpp>
 #include <catch2/benchmark/detail/catch_run_for_at_least.hpp>
 
-#include <algorithm>
+#include <vector>
-#include <iterator>
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
         struct ExecutionPlan {
             int iterations_per_sample;
-            Duration estimated_duration;
+            FDuration estimated_duration;
             Detail::BenchmarkFunction benchmark;
-            Duration warmup_time;
+            FDuration warmup_time;
             int warmup_iterations;
 
-            template <typename Duration2>
-            operator ExecutionPlan<Duration2>() const {
-                return { iterations_per_sample, estimated_duration, benchmark, warmup_time, warmup_iterations };
-            }
-
             template <typename Clock>
-            std::vector<FloatDuration<Clock>> run(const IConfig &cfg, Environment<FloatDuration<Clock>> env) const {
+            std::vector<FDuration> run(const IConfig &cfg, Environment env) const {
                 // warmup a bit
-                Detail::run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(warmup_time), warmup_iterations, Detail::repeat(now<Clock>{}));
+                Detail::run_for_at_least<Clock>(
+                    std::chrono::duration_cast<IDuration>( warmup_time ),
+                    warmup_iterations,
+                    Detail::repeat( []() { return Clock::now(); } )
+                );
 
-                std::vector<FloatDuration<Clock>> times;
+                std::vector<FDuration> times;
-                times.reserve(cfg.benchmarkSamples());
+                const auto num_samples = cfg.benchmarkSamples();
-                std::generate_n(std::back_inserter(times), cfg.benchmarkSamples(), [this, env] {
+                times.reserve( num_samples );
+                for ( size_t i = 0; i < num_samples; ++i ) {
                     Detail::ChronometerModel<Clock> model;
-                    this->benchmark(Chronometer(model, iterations_per_sample));
+                    this->benchmark( Chronometer( model, iterations_per_sample ) );
                     auto sample_time = model.elapsed() - env.clock_cost.mean;
-                    if (sample_time < FloatDuration<Clock>::zero()) sample_time = FloatDuration<Clock>::zero();
+                    if ( sample_time < FDuration::zero() ) {
-                    return sample_time / iterations_per_sample;
+                        sample_time = FDuration::zero();
-                });
+                    }
+                    times.push_back(sample_time / iterations_per_sample);
+                }
                 return times;
             }
         };

src/catch2/benchmark/catch_optimizer.hpp

@@ -70,7 +70,7 @@ namespace Catch {
 
         template <typename Fn, typename... Args>
         inline auto invoke_deoptimized(Fn&& fn, Args&&... args) -> std::enable_if_t<std::is_same<void, decltype(fn(args...))>::value> {
-            CATCH_FORWARD(fn) (CATCH_FORWARD(args)...);
+            CATCH_FORWARD((fn)) (CATCH_FORWARD(args)...);
         }
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/catch_sample_analysis.hpp

@@ -10,38 +10,20 @@
 #ifndef CATCH_SAMPLE_ANALYSIS_HPP_INCLUDED
 #define CATCH_SAMPLE_ANALYSIS_HPP_INCLUDED
 
-#include <catch2/benchmark/catch_clock.hpp>
 #include <catch2/benchmark/catch_estimate.hpp>
 #include <catch2/benchmark/catch_outlier_classification.hpp>
-#include <catch2/internal/catch_move_and_forward.hpp>
+#include <catch2/benchmark/catch_clock.hpp>
 
-#include <algorithm>
 #include <vector>
-#include <iterator>
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration>
         struct SampleAnalysis {
-            std::vector<Duration> samples;
+            std::vector<FDuration> samples;
-            Estimate<Duration> mean;
+            Estimate<FDuration> mean;
-            Estimate<Duration> standard_deviation;
+            Estimate<FDuration> standard_deviation;
             OutlierClassification outliers;
             double outlier_variance;
-
-            template <typename Duration2>
-            operator SampleAnalysis<Duration2>() const {
-                std::vector<Duration2> samples2;
-                samples2.reserve(samples.size());
-                std::transform(samples.begin(), samples.end(), std::back_inserter(samples2), [](Duration d) { return Duration2(d); });
-                return {
-                    CATCH_MOVE(samples2),
-                    mean,
-                    standard_deviation,
-                    outliers,
-                    outlier_variance,
-                };
-            }
         };
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/detail/catch_analyse.cpp

@@ -0,0 +1,85 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+// Adapted from donated nonius code.
+
+#include <catch2/benchmark/detail/catch_analyse.hpp>
+#include <catch2/benchmark/catch_clock.hpp>
+#include <catch2/benchmark/catch_sample_analysis.hpp>
+#include <catch2/benchmark/detail/catch_stats.hpp>
+#include <catch2/interfaces/catch_interfaces_config.hpp>
+#include <catch2/internal/catch_move_and_forward.hpp>
+
+#include <vector>
+
+namespace Catch {
+    namespace Benchmark {
+        namespace Detail {
+            SampleAnalysis analyse(const IConfig &cfg, FDuration* first, FDuration* last) {
+                if (!cfg.benchmarkNoAnalysis()) {
+                    std::vector<double> samples;
+                    samples.reserve(static_cast<size_t>(last - first));
+                    for (auto current = first; current != last; ++current) {
+                        samples.push_back( current->count() );
+                    }
+
+                    auto analysis = Catch::Benchmark::Detail::analyse_samples(
+                        cfg.benchmarkConfidenceInterval(),
+                        cfg.benchmarkResamples(),
+                        samples.data(),
+                        samples.data() + samples.size() );
+                    auto outliers = Catch::Benchmark::Detail::classify_outliers(
+                        samples.data(), samples.data() + samples.size() );
+
+                    auto wrap_estimate = [](Estimate<double> e) {
+                        return Estimate<FDuration> {
+                            FDuration(e.point),
+                                FDuration(e.lower_bound),
+                                FDuration(e.upper_bound),
+                                e.confidence_interval,
+                        };
+                    };
+                    std::vector<FDuration> samples2;
+                    samples2.reserve(samples.size());
+                    for (auto s : samples) {
+                        samples2.push_back( FDuration( s ) );
+                    }
+
+                    return {
+                        CATCH_MOVE(samples2),
+                        wrap_estimate(analysis.mean),
+                        wrap_estimate(analysis.standard_deviation),
+                        outliers,
+                        analysis.outlier_variance,
+                    };
+                } else {
+                    std::vector<FDuration> samples;
+                    samples.reserve(static_cast<size_t>(last - first));
+
+                    FDuration mean = FDuration(0);
+                    int i = 0;
+                    for (auto it = first; it < last; ++it, ++i) {
+                        samples.push_back(FDuration(*it));
+                        mean += FDuration(*it);
+                    }
+                    mean /= i;
+
+                    return SampleAnalysis{
+                        CATCH_MOVE(samples),
+                        Estimate<FDuration>{ mean, mean, mean, 0.0 },
+                        Estimate<FDuration>{ FDuration( 0 ),
+                                             FDuration( 0 ),
+                                             FDuration( 0 ),
+                                             0.0 },
+                        OutlierClassification{},
+                        0.0
+                    };
+                }
+            }
+        } // namespace Detail
+    } // namespace Benchmark
+} // namespace Catch

src/catch2/benchmark/detail/catch_analyse.hpp

@@ -11,68 +11,15 @@
 #define CATCH_ANALYSE_HPP_INCLUDED
 
 #include <catch2/benchmark/catch_clock.hpp>
-#include <catch2/benchmark/catch_environment.hpp>
 #include <catch2/benchmark/catch_sample_analysis.hpp>
-#include <catch2/benchmark/detail/catch_stats.hpp>
-#include <catch2/interfaces/catch_interfaces_config.hpp>
-#include <catch2/internal/catch_move_and_forward.hpp>
 
-#include <algorithm>
-#include <iterator>
-#include <vector>
 
 namespace Catch {
+    class IConfig;
+
     namespace Benchmark {
         namespace Detail {
-            template <typename Duration, typename Iterator>
+            SampleAnalysis analyse(const IConfig &cfg, FDuration* first, FDuration* last);
-            SampleAnalysis<Duration> analyse(const IConfig &cfg, Environment<Duration>, Iterator first, Iterator last) {
-                if (!cfg.benchmarkNoAnalysis()) {
-                    std::vector<double> samples;
-                    samples.reserve(static_cast<size_t>(last - first));
-                    std::transform(first, last, std::back_inserter(samples), [](Duration d) { return d.count(); });
-
-                    auto analysis = Catch::Benchmark::Detail::analyse_samples(cfg.benchmarkConfidenceInterval(), cfg.benchmarkResamples(), samples.begin(), samples.end());
-                    auto outliers = Catch::Benchmark::Detail::classify_outliers(samples.begin(), samples.end());
-
-                    auto wrap_estimate = [](Estimate<double> e) {
-                        return Estimate<Duration> {
-                            Duration(e.point),
-                                Duration(e.lower_bound),
-                                Duration(e.upper_bound),
-                                e.confidence_interval,
-                        };
-                    };
-                    std::vector<Duration> samples2;
-                    samples2.reserve(samples.size());
-                    std::transform(samples.begin(), samples.end(), std::back_inserter(samples2), [](double d) { return Duration(d); });
-                    return {
-                        CATCH_MOVE(samples2),
-                        wrap_estimate(analysis.mean),
-                        wrap_estimate(analysis.standard_deviation),
-                        outliers,
-                        analysis.outlier_variance,
-                    };
-                } else {
-                    std::vector<Duration> samples;
-                    samples.reserve(static_cast<size_t>(last - first));
-
-                    Duration mean = Duration(0);
-                    int i = 0;
-                    for (auto it = first; it < last; ++it, ++i) {
-                        samples.push_back(Duration(*it));
-                        mean += Duration(*it);
-                    }
-                    mean /= i;
-
-                    return {
-                        CATCH_MOVE(samples),
-                        Estimate<Duration>{mean, mean, mean, 0.0},
-                        Estimate<Duration>{Duration(0), Duration(0), Duration(0), 0.0},
-                        OutlierClassification{},
-                        0.0
-                    };
-                }
-            }
         } // namespace Detail
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/detail/catch_benchmark_function.hpp

@@ -11,7 +11,6 @@
 #define CATCH_BENCHMARK_FUNCTION_HPP_INCLUDED
 
 #include <catch2/benchmark/catch_chronometer.hpp>
-#include <catch2/benchmark/detail/catch_complete_invoke.hpp>
 #include <catch2/internal/catch_meta.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>

src/catch2/benchmark/detail/catch_benchmark_stats.hpp

@@ -0,0 +1,48 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#ifndef CATCH_BENCHMARK_STATS_HPP_INCLUDED
+#define CATCH_BENCHMARK_STATS_HPP_INCLUDED
+
+#include <catch2/benchmark/catch_estimate.hpp>
+#include <catch2/benchmark/catch_outlier_classification.hpp>
+// The fwd decl & default specialization needs to be seen by VS2017 before
+// BenchmarkStats itself, or VS2017 will report compilation error.
+#include <catch2/benchmark/detail/catch_benchmark_stats_fwd.hpp>
+
+#include <string>
+#include <vector>
+
+namespace Catch {
+
+    struct BenchmarkInfo {
+        std::string name;
+        double estimatedDuration;
+        int iterations;
+        unsigned int samples;
+        unsigned int resamples;
+        double clockResolution;
+        double clockCost;
+    };
+
+    // We need to keep template parameter for backwards compatibility,
+    // but we also do not want to use the template paraneter.
+    template <class Dummy>
+    struct BenchmarkStats {
+        BenchmarkInfo info;
+
+        std::vector<Benchmark::FDuration> samples;
+        Benchmark::Estimate<Benchmark::FDuration> mean;
+        Benchmark::Estimate<Benchmark::FDuration> standardDeviation;
+        Benchmark::OutlierClassification outliers;
+        double outlierVariance;
+    };
+
+
+} // end namespace Catch
+
+#endif // CATCH_BENCHMARK_STATS_HPP_INCLUDED

src/catch2/benchmark/detail/catch_benchmark_stats_fwd.hpp

@@ -0,0 +1,23 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#ifndef CATCH_BENCHMARK_STATS_FWD_HPP_INCLUDED
+#define CATCH_BENCHMARK_STATS_FWD_HPP_INCLUDED
+
+#include <catch2/benchmark/catch_clock.hpp>
+
+namespace Catch {
+
+    // We cannot forward declare the type with default template argument
+    // multiple times, so it is split out into a separate header so that
+    // we can prevent multiple declarations in dependees
+    template <typename Duration = Benchmark::FDuration>
+    struct BenchmarkStats;
+
+} // end namespace Catch
+
+#endif // CATCH_BENCHMARK_STATS_FWD_HPP_INCLUDED

src/catch2/benchmark/detail/catch_complete_invoke.hpp

@@ -10,14 +10,9 @@
 #ifndef CATCH_COMPLETE_INVOKE_HPP_INCLUDED
 #define CATCH_COMPLETE_INVOKE_HPP_INCLUDED
 
-#include <catch2/internal/catch_test_failure_exception.hpp>
 #include <catch2/internal/catch_meta.hpp>
-#include <catch2/interfaces/catch_interfaces_capture.hpp>
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 
-#include <type_traits>
-
 namespace Catch {
     namespace Benchmark {
         namespace Detail {

src/catch2/benchmark/detail/catch_estimate_clock.hpp

@@ -19,7 +19,6 @@
 #include <catch2/internal/catch_unique_ptr.hpp>
 
 #include <algorithm>
-#include <iterator>
 #include <vector>
 #include <cmath>
 
@@ -30,46 +29,49 @@ namespace Catch {
             std::vector<double> resolution(int k) {
                 std::vector<TimePoint<Clock>> times;
                 times.reserve(static_cast<size_t>(k + 1));
-                std::generate_n(std::back_inserter(times), k + 1, now<Clock>{});
+                for ( int i = 0; i < k + 1; ++i ) {
+                    times.push_back( Clock::now() );
+                }
 
                 std::vector<double> deltas;
                 deltas.reserve(static_cast<size_t>(k));
-                std::transform(std::next(times.begin()), times.end(), times.begin(),
+                for ( size_t idx = 1; idx < times.size(); ++idx ) {
-                    std::back_inserter(deltas),
+                    deltas.push_back( static_cast<double>(
-                    [](TimePoint<Clock> a, TimePoint<Clock> b) { return static_cast<double>((a - b).count()); });
+                        ( times[idx] - times[idx - 1] ).count() ) );
+                }
 
                 return deltas;
             }
 
-            const auto warmup_iterations = 10000;
+            constexpr auto warmup_iterations = 10000;
-            const auto warmup_time = std::chrono::milliseconds(100);
+            constexpr auto warmup_time = std::chrono::milliseconds(100);
-            const auto minimum_ticks = 1000;
+            constexpr auto minimum_ticks = 1000;
-            const auto warmup_seed = 10000;
+            constexpr auto warmup_seed = 10000;
-            const auto clock_resolution_estimation_time = std::chrono::milliseconds(500);
+            constexpr auto clock_resolution_estimation_time = std::chrono::milliseconds(500);
-            const auto clock_cost_estimation_time_limit = std::chrono::seconds(1);
+            constexpr auto clock_cost_estimation_time_limit = std::chrono::seconds(1);
-            const auto clock_cost_estimation_tick_limit = 100000;
+            constexpr auto clock_cost_estimation_tick_limit = 100000;
-            const auto clock_cost_estimation_time = std::chrono::milliseconds(10);
+            constexpr auto clock_cost_estimation_time = std::chrono::milliseconds(10);
-            const auto clock_cost_estimation_iterations = 10000;
+            constexpr auto clock_cost_estimation_iterations = 10000;
 
             template <typename Clock>
             int warmup() {
-                return run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(warmup_time), warmup_seed, &resolution<Clock>)
+                return run_for_at_least<Clock>(warmup_time, warmup_seed, &resolution<Clock>)
                     .iterations;
             }
             template <typename Clock>
-            EnvironmentEstimate<FloatDuration<Clock>> estimate_clock_resolution(int iterations) {
+            EnvironmentEstimate estimate_clock_resolution(int iterations) {
-                auto r = run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(clock_resolution_estimation_time), iterations, &resolution<Clock>)
+                auto r = run_for_at_least<Clock>(clock_resolution_estimation_time, iterations, &resolution<Clock>)
                     .result;
                 return {
-                    FloatDuration<Clock>(mean(r.begin(), r.end())),
+                    FDuration(mean(r.data(), r.data() + r.size())),
-                    classify_outliers(r.begin(), r.end()),
+                    classify_outliers(r.data(), r.data() + r.size()),
                 };
             }
             template <typename Clock>
-            EnvironmentEstimate<FloatDuration<Clock>> estimate_clock_cost(FloatDuration<Clock> resolution) {
+            EnvironmentEstimate estimate_clock_cost(FDuration resolution) {
                 auto time_limit = (std::min)(
                     resolution * clock_cost_estimation_tick_limit,
-                    FloatDuration<Clock>(clock_cost_estimation_time_limit));
+                    FDuration(clock_cost_estimation_time_limit));
                 auto time_clock = [](int k) {
                     return Detail::measure<Clock>([k] {
                         for (int i = 0; i < k; ++i) {
@@ -80,26 +82,28 @@ namespace Catch {
                 };
                 time_clock(1);
                 int iters = clock_cost_estimation_iterations;
-                auto&& r = run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(clock_cost_estimation_time), iters, time_clock);
+                auto&& r = run_for_at_least<Clock>(clock_cost_estimation_time, iters, time_clock);
                 std::vector<double> times;
                 int nsamples = static_cast<int>(std::ceil(time_limit / r.elapsed));
                 times.reserve(static_cast<size_t>(nsamples));
-                std::generate_n(std::back_inserter(times), nsamples, [time_clock, &r] {
+                for ( int s = 0; s < nsamples; ++s ) {
-                    return static_cast<double>((time_clock(r.iterations) / r.iterations).count());
+                    times.push_back( static_cast<double>(
-                });
+                        ( time_clock( r.iterations ) / r.iterations )
+                            .count() ) );
+                }
                 return {
-                    FloatDuration<Clock>(mean(times.begin(), times.end())),
+                    FDuration(mean(times.data(), times.data() + times.size())),
-                    classify_outliers(times.begin(), times.end()),
+                    classify_outliers(times.data(), times.data() + times.size()),
                 };
             }
 
             template <typename Clock>
-            Environment<FloatDuration<Clock>> measure_environment() {
+            Environment measure_environment() {
 #if defined(__clang__)
 #    pragma clang diagnostic push
 #    pragma clang diagnostic ignored "-Wexit-time-destructors"
 #endif
-                static Catch::Detail::unique_ptr<Environment<FloatDuration<Clock>>> env;
+                static Catch::Detail::unique_ptr<Environment> env;
 #if defined(__clang__)
 #    pragma clang diagnostic pop
 #endif
@@ -111,7 +115,7 @@ namespace Catch {
                 auto resolution = Detail::estimate_clock_resolution<Clock>(iters);
                 auto cost = Detail::estimate_clock_cost<Clock>(resolution.mean);
 
-                env = Catch::Detail::make_unique<Environment<FloatDuration<Clock>>>( Environment<FloatDuration<Clock>>{resolution, cost} );
+                env = Catch::Detail::make_unique<Environment>( Environment{resolution, cost} );
                 return *env;
             }
         } // namespace Detail

src/catch2/benchmark/detail/catch_measure.hpp

@@ -10,7 +10,6 @@
 #ifndef CATCH_MEASURE_HPP_INCLUDED
 #define CATCH_MEASURE_HPP_INCLUDED
 
-#include <catch2/benchmark/catch_clock.hpp>
 #include <catch2/benchmark/detail/catch_complete_invoke.hpp>
 #include <catch2/benchmark/detail/catch_timing.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
@@ -19,7 +18,7 @@ namespace Catch {
     namespace Benchmark {
         namespace Detail {
             template <typename Clock, typename Fun, typename... Args>
-            TimingOf<Clock, Fun, Args...> measure(Fun&& fun, Args&&... args) {
+            TimingOf<Fun, Args...> measure(Fun&& fun, Args&&... args) {
                 auto start = Clock::now();
                 auto&& r = Detail::complete_invoke(fun, CATCH_FORWARD(args)...);
                 auto end = Clock::now();

src/catch2/benchmark/detail/catch_run_for_at_least.cpp

@@ -7,9 +7,10 @@
 // SPDX-License-Identifier: BSL-1.0
 
 #include <catch2/benchmark/detail/catch_run_for_at_least.hpp>
-#include <exception>
 #include <catch2/internal/catch_enforce.hpp>
 
+#include <exception>
+
 namespace Catch {
     namespace Benchmark {
         namespace Detail {

src/catch2/benchmark/detail/catch_run_for_at_least.hpp

@@ -24,11 +24,11 @@ namespace Catch {
     namespace Benchmark {
         namespace Detail {
             template <typename Clock, typename Fun>
-            TimingOf<Clock, Fun, int> measure_one(Fun&& fun, int iters, std::false_type) {
+            TimingOf<Fun, int> measure_one(Fun&& fun, int iters, std::false_type) {
                 return Detail::measure<Clock>(fun, iters);
             }
             template <typename Clock, typename Fun>
-            TimingOf<Clock, Fun, Chronometer> measure_one(Fun&& fun, int iters, std::true_type) {
+            TimingOf<Fun, Chronometer> measure_one(Fun&& fun, int iters, std::true_type) {
                 Detail::ChronometerModel<Clock> meter;
                 auto&& result = Detail::complete_invoke(fun, Chronometer(meter, iters));
 
@@ -43,8 +43,8 @@ namespace Catch {
             void throw_optimized_away_error();
 
             template <typename Clock, typename Fun>
-            TimingOf<Clock, Fun, run_for_at_least_argument_t<Clock, Fun>>
+            TimingOf<Fun, run_for_at_least_argument_t<Clock, Fun>>
-                run_for_at_least(ClockDuration<Clock> how_long,
+                run_for_at_least(IDuration how_long,
                                  const int initial_iterations,
                                  Fun&& fun) {
                 auto iters = initial_iterations;

src/catch2/benchmark/detail/catch_stats.cpp

@@ -10,10 +10,14 @@
 #include <catch2/benchmark/detail/catch_stats.hpp>
 
 #include <catch2/internal/catch_compiler_capabilities.hpp>
+#include <catch2/internal/catch_floating_point_helpers.hpp>
+#include <catch2/internal/catch_random_number_generator.hpp>
 
+#include <algorithm>
 #include <cassert>
+#include <cmath>
 #include <cstddef>
-#include <iterator>
+#include <numeric>
 #include <random>
 
 
@@ -21,139 +25,204 @@
 #include <future>
 #endif
 
-namespace {
+namespace Catch {
+    namespace Benchmark {
+        namespace Detail {
+            namespace {
 
-using Catch::Benchmark::Detail::sample;
+                template <typename URng, typename Estimator>
+                static sample
+                resample( URng& rng,
+                          unsigned int resamples,
+                          double const* first,
+                          double const* last,
+                          Estimator& estimator ) {
+                    auto n = static_cast<size_t>( last - first );
+                    std::uniform_int_distribution<decltype( n )> dist( 0,
+                                                                       n - 1 );
 
-     template <typename URng, typename Estimator>
+                    sample out;
-     sample resample(URng& rng, unsigned int resamples, std::vector<double>::iterator first, std::vector<double>::iterator last, Estimator& estimator) {
+                    out.reserve( resamples );
-         auto n = static_cast<size_t>(last - first);
+                    // We allocate the vector outside the loop to avoid realloc
-         std::uniform_int_distribution<decltype(n)> dist(0, n - 1);
+                    // per resample
+                    std::vector<double> resampled;
+                    resampled.reserve( n );
+                    for ( size_t i = 0; i < resamples; ++i ) {
+                        resampled.clear();
+                        for ( size_t s = 0; s < n; ++s ) {
+                            resampled.push_back(
+                                first[static_cast<std::ptrdiff_t>(
+                                    dist( rng ) )] );
+                        }
+                        const auto estimate =
+                            estimator( resampled.data(), resampled.data() + resampled.size() );
+                        out.push_back( estimate );
+                    }
+                    std::sort( out.begin(), out.end() );
+                    return out;
+                }
 
-         sample out;
+                static double outlier_variance( Estimate<double> mean,
-         out.reserve(resamples);
+                                                Estimate<double> stddev,
-         std::generate_n(std::back_inserter(out), resamples, [n, first, &estimator, &dist, &rng] {
+                                                int n ) {
-             std::vector<double> resampled;
+                    double sb = stddev.point;
-             resampled.reserve(n);
+                    double mn = mean.point / n;
-             std::generate_n(std::back_inserter(resampled), n, [first, &dist, &rng] { return first[static_cast<std::ptrdiff_t>(dist(rng))]; });
+                    double mg_min = mn / 2.;
-             return estimator(resampled.begin(), resampled.end());
+                    double sg = (std::min)( mg_min / 4., sb / std::sqrt( n ) );
-         });
+                    double sg2 = sg * sg;
-         std::sort(out.begin(), out.end());
+                    double sb2 = sb * sb;
-         return out;
+
-     }
+                    auto c_max = [n, mn, sb2, sg2]( double x ) -> double {
+                        double k = mn - x;
+                        double d = k * k;
+                        double nd = n * d;
+                        double k0 = -n * nd;
+                        double k1 = sb2 - n * sg2 + nd;
+                        double det = k1 * k1 - 4 * sg2 * k0;
+                        return static_cast<int>( -2. * k0 /
+                                                 ( k1 + std::sqrt( det ) ) );
+                    };
+
+                    auto var_out = [n, sb2, sg2]( double c ) {
+                        double nc = n - c;
+                        return ( nc / n ) * ( sb2 - nc * sg2 );
+                    };
+
+                    return (std::min)( var_out( 1 ),
+                                       var_out(
+                                           (std::min)( c_max( 0. ),
+                                                       c_max( mg_min ) ) ) ) /
+                           sb2;
+                }
+
+                static double erf_inv( double x ) {
+                    // Code accompanying the article "Approximating the erfinv
+                    // function" in GPU Computing Gems, Volume 2
+                    double w, p;
+
+                    w = -log( ( 1.0 - x ) * ( 1.0 + x ) );
+
+                    if ( w < 6.250000 ) {
+                        w = w - 3.125000;
+                        p = -3.6444120640178196996e-21;
+                        p = -1.685059138182016589e-19 + p * w;
+                        p = 1.2858480715256400167e-18 + p * w;
+                        p = 1.115787767802518096e-17 + p * w;
+                        p = -1.333171662854620906e-16 + p * w;
+                        p = 2.0972767875968561637e-17 + p * w;
+                        p = 6.6376381343583238325e-15 + p * w;
+                        p = -4.0545662729752068639e-14 + p * w;
+                        p = -8.1519341976054721522e-14 + p * w;
+                        p = 2.6335093153082322977e-12 + p * w;
+                        p = -1.2975133253453532498e-11 + p * w;
+                        p = -5.4154120542946279317e-11 + p * w;
+                        p = 1.051212273321532285e-09 + p * w;
+                        p = -4.1126339803469836976e-09 + p * w;
+                        p = -2.9070369957882005086e-08 + p * w;
+                        p = 4.2347877827932403518e-07 + p * w;
+                        p = -1.3654692000834678645e-06 + p * w;
+                        p = -1.3882523362786468719e-05 + p * w;
+                        p = 0.0001867342080340571352 + p * w;
+                        p = -0.00074070253416626697512 + p * w;
+                        p = -0.0060336708714301490533 + p * w;
+                        p = 0.24015818242558961693 + p * w;
+                        p = 1.6536545626831027356 + p * w;
+                    } else if ( w < 16.000000 ) {
+                        w = sqrt( w ) - 3.250000;
+                        p = 2.2137376921775787049e-09;
+                        p = 9.0756561938885390979e-08 + p * w;
+                        p = -2.7517406297064545428e-07 + p * w;
+                        p = 1.8239629214389227755e-08 + p * w;
+                        p = 1.5027403968909827627e-06 + p * w;
+                        p = -4.013867526981545969e-06 + p * w;
+                        p = 2.9234449089955446044e-06 + p * w;
+                        p = 1.2475304481671778723e-05 + p * w;
+                        p = -4.7318229009055733981e-05 + p * w;
+                        p = 6.8284851459573175448e-05 + p * w;
+                        p = 2.4031110387097893999e-05 + p * w;
+                        p = -0.0003550375203628474796 + p * w;
+                        p = 0.00095328937973738049703 + p * w;
+                        p = -0.0016882755560235047313 + p * w;
+                        p = 0.0024914420961078508066 + p * w;
+                        p = -0.0037512085075692412107 + p * w;
+                        p = 0.005370914553590063617 + p * w;
+                        p = 1.0052589676941592334 + p * w;
+                        p = 3.0838856104922207635 + p * w;
+                    } else {
+                        w = sqrt( w ) - 5.000000;
+                        p = -2.7109920616438573243e-11;
+                        p = -2.5556418169965252055e-10 + p * w;
+                        p = 1.5076572693500548083e-09 + p * w;
+                        p = -3.7894654401267369937e-09 + p * w;
+                        p = 7.6157012080783393804e-09 + p * w;
+                        p = -1.4960026627149240478e-08 + p * w;
+                        p = 2.9147953450901080826e-08 + p * w;
+                        p = -6.7711997758452339498e-08 + p * w;
+                        p = 2.2900482228026654717e-07 + p * w;
+                        p = -9.9298272942317002539e-07 + p * w;
+                        p = 4.5260625972231537039e-06 + p * w;
+                        p = -1.9681778105531670567e-05 + p * w;
+                        p = 7.5995277030017761139e-05 + p * w;
+                        p = -0.00021503011930044477347 + p * w;
+                        p = -0.00013871931833623122026 + p * w;
+                        p = 1.0103004648645343977 + p * w;
+                        p = 4.8499064014085844221 + p * w;
+                    }
+                    return p * x;
+                }
+
+                static double
+                standard_deviation( double const* first, double const* last ) {
+                    auto m = Catch::Benchmark::Detail::mean( first, last );
+                    double variance =
+                        std::accumulate( first,
+                                         last,
+                                         0.,
+                                         [m]( double a, double b ) {
+                                             double diff = b - m;
+                                             return a + diff * diff;
+                                         } ) /
+                        ( last - first );
+                    return std::sqrt( variance );
+                }
+
+                static sample jackknife( double ( *estimator )( double const*,
+                                                                double const* ),
+                                         double* first,
+                                         double* last ) {
+                    const auto second = first + 1;
+                    sample results;
+                    results.reserve( static_cast<size_t>( last - first ) );
+
+                    for ( auto it = first; it != last; ++it ) {
+                        std::iter_swap( it, first );
+                        results.push_back( estimator( second, last ) );
+                    }
+
+                    return results;
+                }
 
 
-    double erf_inv(double x) {
+            } // namespace
-        // Code accompanying the article "Approximating the erfinv function" in GPU Computing Gems, Volume 2
+        }     // namespace Detail
-        double w, p;
+    }         // namespace Benchmark
-
+} // namespace Catch
-        w = -log((1.0 - x) * (1.0 + x));
-
-        if (w < 6.250000) {
-            w = w - 3.125000;
-            p = -3.6444120640178196996e-21;
-            p = -1.685059138182016589e-19 + p * w;
-            p = 1.2858480715256400167e-18 + p * w;
-            p = 1.115787767802518096e-17 + p * w;
-            p = -1.333171662854620906e-16 + p * w;
-            p = 2.0972767875968561637e-17 + p * w;
-            p = 6.6376381343583238325e-15 + p * w;
-            p = -4.0545662729752068639e-14 + p * w;
-            p = -8.1519341976054721522e-14 + p * w;
-            p = 2.6335093153082322977e-12 + p * w;
-            p = -1.2975133253453532498e-11 + p * w;
-            p = -5.4154120542946279317e-11 + p * w;
-            p = 1.051212273321532285e-09 + p * w;
-            p = -4.1126339803469836976e-09 + p * w;
-            p = -2.9070369957882005086e-08 + p * w;
-            p = 4.2347877827932403518e-07 + p * w;
-            p = -1.3654692000834678645e-06 + p * w;
-            p = -1.3882523362786468719e-05 + p * w;
-            p = 0.0001867342080340571352 + p * w;
-            p = -0.00074070253416626697512 + p * w;
-            p = -0.0060336708714301490533 + p * w;
-            p = 0.24015818242558961693 + p * w;
-            p = 1.6536545626831027356 + p * w;
-        } else if (w < 16.000000) {
-            w = sqrt(w) - 3.250000;
-            p = 2.2137376921775787049e-09;
-            p = 9.0756561938885390979e-08 + p * w;
-            p = -2.7517406297064545428e-07 + p * w;
-            p = 1.8239629214389227755e-08 + p * w;
-            p = 1.5027403968909827627e-06 + p * w;
-            p = -4.013867526981545969e-06 + p * w;
-            p = 2.9234449089955446044e-06 + p * w;
-            p = 1.2475304481671778723e-05 + p * w;
-            p = -4.7318229009055733981e-05 + p * w;
-            p = 6.8284851459573175448e-05 + p * w;
-            p = 2.4031110387097893999e-05 + p * w;
-            p = -0.0003550375203628474796 + p * w;
-            p = 0.00095328937973738049703 + p * w;
-            p = -0.0016882755560235047313 + p * w;
-            p = 0.0024914420961078508066 + p * w;
-            p = -0.0037512085075692412107 + p * w;
-            p = 0.005370914553590063617 + p * w;
-            p = 1.0052589676941592334 + p * w;
-            p = 3.0838856104922207635 + p * w;
-        } else {
-            w = sqrt(w) - 5.000000;
-            p = -2.7109920616438573243e-11;
-            p = -2.5556418169965252055e-10 + p * w;
-            p = 1.5076572693500548083e-09 + p * w;
-            p = -3.7894654401267369937e-09 + p * w;
-            p = 7.6157012080783393804e-09 + p * w;
-            p = -1.4960026627149240478e-08 + p * w;
-            p = 2.9147953450901080826e-08 + p * w;
-            p = -6.7711997758452339498e-08 + p * w;
-            p = 2.2900482228026654717e-07 + p * w;
-            p = -9.9298272942317002539e-07 + p * w;
-            p = 4.5260625972231537039e-06 + p * w;
-            p = -1.9681778105531670567e-05 + p * w;
-            p = 7.5995277030017761139e-05 + p * w;
-            p = -0.00021503011930044477347 + p * w;
-            p = -0.00013871931833623122026 + p * w;
-            p = 1.0103004648645343977 + p * w;
-            p = 4.8499064014085844221 + p * w;
-        }
-        return p * x;
-    }
-
-    double standard_deviation(std::vector<double>::iterator first, std::vector<double>::iterator last) {
-        auto m = Catch::Benchmark::Detail::mean(first, last);
-        double variance = std::accumulate( first,
-                                           last,
-                                           0.,
-                                           [m]( double a, double b ) {
-                                               double diff = b - m;
-                                               return a + diff * diff;
-                                           } ) /
-                          ( last - first );
-        return std::sqrt( variance );
-    }
-
-}
 
 namespace Catch {
     namespace Benchmark {
         namespace Detail {
 
-#if defined( __GNUC__ ) || defined( __clang__ )
+            double weighted_average_quantile( int k,
-#    pragma GCC diagnostic push
+                                              int q,
-#    pragma GCC diagnostic ignored "-Wfloat-equal"
+                                              double* first,
-#endif
+                                              double* last ) {
-            bool directCompare( double lhs, double rhs ) { return lhs == rhs; }
-#if defined( __GNUC__ ) || defined( __clang__ )
-#    pragma GCC diagnostic pop
-#endif
-
-            double weighted_average_quantile(int k, int q, std::vector<double>::iterator first, std::vector<double>::iterator last) {
                 auto count = last - first;
                 double idx = (count - 1) * k / static_cast<double>(q);
                 int j = static_cast<int>(idx);
                 double g = idx - j;
                 std::nth_element(first, first + j, last);
                 auto xj = first[j];
-                if ( directCompare( g, 0 ) ) {
+                if ( Catch::Detail::directCompare( g, 0 ) ) {
                     return xj;
                 }
 
@@ -161,6 +230,48 @@ namespace Catch {
                 return xj + g * (xj1 - xj);
             }
 
+            OutlierClassification
+            classify_outliers( double const* first, double const* last ) {
+                std::vector<double> copy( first, last );
+
+                auto q1 = weighted_average_quantile( 1, 4, copy.data(), copy.data() + copy.size() );
+                auto q3 = weighted_average_quantile( 3, 4, copy.data(), copy.data() + copy.size() );
+                auto iqr = q3 - q1;
+                auto los = q1 - ( iqr * 3. );
+                auto lom = q1 - ( iqr * 1.5 );
+                auto him = q3 + ( iqr * 1.5 );
+                auto his = q3 + ( iqr * 3. );
+
+                OutlierClassification o;
+                for ( ; first != last; ++first ) {
+                    const double t = *first;
+                    if ( t < los ) {
+                        ++o.low_severe;
+                    } else if ( t < lom ) {
+                        ++o.low_mild;
+                    } else if ( t > his ) {
+                        ++o.high_severe;
+                    } else if ( t > him ) {
+                        ++o.high_mild;
+                    }
+                    ++o.samples_seen;
+                }
+                return o;
+            }
+
+            double mean( double const* first, double const* last ) {
+                auto count = last - first;
+                double sum = 0.;
+                while (first != last) {
+                    sum += *first;
+                    ++first;
+                }
+                return sum / static_cast<double>(count);
+            }
+
+            double normal_cdf( double x ) {
+                return std::erfc( -x / std::sqrt( 2.0 ) ) / 2.0;
+            }
 
             double erfc_inv(double x) {
                 return erf_inv(1.0 - x);
@@ -182,50 +293,77 @@ namespace Catch {
                 return result;
             }
 
+            Estimate<double>
+            bootstrap( double confidence_level,
+                       double* first,
+                       double* last,
+                       sample const& resample,
+                       double ( *estimator )( double const*, double const* ) ) {
+                auto n_samples = last - first;
 
-            double outlier_variance(Estimate<double> mean, Estimate<double> stddev, int n) {
+                double point = estimator( first, last );
-                double sb = stddev.point;
+                // Degenerate case with a single sample
-                double mn = mean.point / n;
+                if ( n_samples == 1 )
-                double mg_min = mn / 2.;
+                    return { point, point, point, confidence_level };
-                double sg = (std::min)(mg_min / 4., sb / std::sqrt(n));
-                double sg2 = sg * sg;
-                double sb2 = sb * sb;
 
-                auto c_max = [n, mn, sb2, sg2](double x) -> double {
+                sample jack = jackknife( estimator, first, last );
-                    double k = mn - x;
+                double jack_mean =
-                    double d = k * k;
+                    mean( jack.data(), jack.data() + jack.size() );
-                    double nd = n * d;
+                double sum_squares = 0, sum_cubes = 0;
-                    double k0 = -n * nd;
+                for ( double x : jack ) {
-                    double k1 = sb2 - n * sg2 + nd;
+                    auto difference = jack_mean - x;
-                    double det = k1 * k1 - 4 * sg2 * k0;
+                    auto square = difference * difference;
-                    return static_cast<int>(-2. * k0 / (k1 + std::sqrt(det)));
+                    auto cube = square * difference;
+                    sum_squares += square;
+                    sum_cubes += cube;
+                }
+
+                double accel = sum_cubes / ( 6 * std::pow( sum_squares, 1.5 ) );
+                long n = static_cast<long>( resample.size() );
+                double prob_n =
+                    std::count_if( resample.begin(),
+                                   resample.end(),
+                                   [point]( double x ) { return x < point; } ) /
+                    static_cast<double>( n );
+                // degenerate case with uniform samples
+                if ( Catch::Detail::directCompare( prob_n, 0. ) ) {
+                    return { point, point, point, confidence_level };
+                }
+
+                double bias = normal_quantile( prob_n );
+                double z1 = normal_quantile( ( 1. - confidence_level ) / 2. );
+
+                auto cumn = [n]( double x ) -> long {
+                    return std::lround( normal_cdf( x ) *
+                                        static_cast<double>( n ) );
                 };
-
+                auto a = [bias, accel]( double b ) {
-                auto var_out = [n, sb2, sg2](double c) {
+                    return bias + b / ( 1. - accel * b );
-                    double nc = n - c;
-                    return (nc / n) * (sb2 - nc * sg2);
                 };
+                double b1 = bias + z1;
+                double b2 = bias - z1;
+                double a1 = a( b1 );
+                double a2 = a( b2 );
+                auto lo = static_cast<size_t>( (std::max)( cumn( a1 ), 0l ) );
+                auto hi =
+                    static_cast<size_t>( (std::min)( cumn( a2 ), n - 1 ) );
 
-                return (std::min)(var_out(1), var_out((std::min)(c_max(0.), c_max(mg_min)))) / sb2;
+                return { point, resample[lo], resample[hi], confidence_level };
             }
 
-
+            bootstrap_analysis analyse_samples(double confidence_level,
-            bootstrap_analysis analyse_samples(double confidence_level, unsigned int n_resamples, std::vector<double>::iterator first, std::vector<double>::iterator last) {
+                                               unsigned int n_resamples,
-                CATCH_INTERNAL_START_WARNINGS_SUPPRESSION
+                                               double* first,
-                CATCH_INTERNAL_SUPPRESS_GLOBALS_WARNINGS
+                                               double* last) {
-                static std::random_device entropy;
+                auto mean = &Detail::mean;
-                CATCH_INTERNAL_STOP_WARNINGS_SUPPRESSION
-
-                auto n = static_cast<int>(last - first); // seriously, one can't use integral types without hell in C++
-
-                auto mean = &Detail::mean<std::vector<double>::iterator>;
                 auto stddev = &standard_deviation;
 
 #if defined(CATCH_CONFIG_USE_ASYNC)
-                auto Estimate = [=](double(*f)(std::vector<double>::iterator, std::vector<double>::iterator)) {
+                auto Estimate = [=](double(*f)(double const*, double const*)) {
-                    auto seed = entropy();
+                    std::random_device rd;
+                    auto seed = rd();
                     return std::async(std::launch::async, [=] {
-                        std::mt19937 rng(seed);
+                        SimplePcg32 rng( seed );
                         auto resampled = resample(rng, n_resamples, first, last, f);
                         return bootstrap(confidence_level, first, last, resampled, f);
                     });
@@ -237,9 +375,10 @@ namespace Catch {
                 auto mean_estimate = mean_future.get();
                 auto stddev_estimate = stddev_future.get();
 #else
-                auto Estimate = [=](double(*f)(std::vector<double>::iterator, std::vector<double>::iterator)) {
+                auto Estimate = [=](double(*f)(double const* , double const*)) {
-                    auto seed = entropy();
+                    std::random_device rd;
-                    std::mt19937 rng(seed);
+                    auto seed = rd();
+                    SimplePcg32 rng( seed );
                     auto resampled = resample(rng, n_resamples, first, last, f);
                     return bootstrap(confidence_level, first, last, resampled, f);
                 };
@@ -248,6 +387,7 @@ namespace Catch {
                 auto stddev_estimate = Estimate(stddev);
 #endif // CATCH_USE_ASYNC
 
+                auto n = static_cast<int>(last - first); // seriously, one can't use integral types without hell in C++
                 double outlier_variance = Detail::outlier_variance(mean_estimate, stddev_estimate, n);
 
                 return { mean_estimate, stddev_estimate, outlier_variance };

src/catch2/benchmark/detail/catch_stats.hpp

@@ -13,122 +13,35 @@
 #include <catch2/benchmark/catch_estimate.hpp>
 #include <catch2/benchmark/catch_outlier_classification.hpp>
 
-#include <algorithm>
 #include <vector>
-#include <numeric>
-#include <tuple>
-#include <cmath>
 
 namespace Catch {
     namespace Benchmark {
         namespace Detail {
             using sample = std::vector<double>;
 
-            // Used when we know we want == comparison of two doubles
+            double weighted_average_quantile( int k,
-            // to centralize warning suppression
+                                              int q,
-            bool directCompare( double lhs, double rhs );
+                                              double* first,
+                                              double* last );
 
-            double weighted_average_quantile(int k, int q, std::vector<double>::iterator first, std::vector<double>::iterator last);
+            OutlierClassification
+            classify_outliers( double const* first, double const* last );
 
-            template <typename Iterator>
+            double mean( double const* first, double const* last );
-            OutlierClassification classify_outliers(Iterator first, Iterator last) {
-                std::vector<double> copy(first, last);
 
-                auto q1 = weighted_average_quantile(1, 4, copy.begin(), copy.end());
+            double normal_cdf( double x );
-                auto q3 = weighted_average_quantile(3, 4, copy.begin(), copy.end());
-                auto iqr = q3 - q1;
-                auto los = q1 - (iqr * 3.);
-                auto lom = q1 - (iqr * 1.5);
-                auto him = q3 + (iqr * 1.5);
-                auto his = q3 + (iqr * 3.);
-
-                OutlierClassification o;
-                for (; first != last; ++first) {
-                    auto&& t = *first;
-                    if (t < los) ++o.low_severe;
-                    else if (t < lom) ++o.low_mild;
-                    else if (t > his) ++o.high_severe;
-                    else if (t > him) ++o.high_mild;
-                    ++o.samples_seen;
-                }
-                return o;
-            }
-
-            template <typename Iterator>
-            double mean(Iterator first, Iterator last) {
-                auto count = last - first;
-                double sum = std::accumulate(first, last, 0.);
-                return sum / static_cast<double>(count);
-            }
-
-            template <typename Estimator, typename Iterator>
-            sample jackknife(Estimator&& estimator, Iterator first, Iterator last) {
-                auto n = static_cast<size_t>(last - first);
-                auto second = first;
-                ++second;
-                sample results;
-                results.reserve(n);
-
-                for (auto it = first; it != last; ++it) {
-                    std::iter_swap(it, first);
-                    results.push_back(estimator(second, last));
-                }
-
-                return results;
-            }
-
-            inline double normal_cdf(double x) {
-                return std::erfc(-x / std::sqrt(2.0)) / 2.0;
-            }
 
             double erfc_inv(double x);
 
             double normal_quantile(double p);
 
-            template <typename Iterator, typename Estimator>
+            Estimate<double>
-            Estimate<double> bootstrap(double confidence_level, Iterator first, Iterator last, sample const& resample, Estimator&& estimator) {
+            bootstrap( double confidence_level,
-                auto n_samples = last - first;
+                       double* first,
-
+                       double* last,
-                double point = estimator(first, last);
+                       sample const& resample,
-                // Degenerate case with a single sample
+                       double ( *estimator )( double const*, double const* ) );
-                if (n_samples == 1) return { point, point, point, confidence_level };
-
-                sample jack = jackknife(estimator, first, last);
-                double jack_mean = mean(jack.begin(), jack.end());
-                double sum_squares, sum_cubes;
-                std::tie(sum_squares, sum_cubes) = std::accumulate(jack.begin(), jack.end(), std::make_pair(0., 0.), [jack_mean](std::pair<double, double> sqcb, double x) -> std::pair<double, double> {
-                    auto d = jack_mean - x;
-                    auto d2 = d * d;
-                    auto d3 = d2 * d;
-                    return { sqcb.first + d2, sqcb.second + d3 };
-                });
-
-                double accel = sum_cubes / (6 * std::pow(sum_squares, 1.5));
-                long n = static_cast<long>(resample.size());
-                double prob_n = std::count_if(resample.begin(), resample.end(), [point](double x) { return x < point; }) / static_cast<double>(n);
-                // degenerate case with uniform samples
-                if ( directCompare( prob_n, 0. ) ) {
-                    return { point, point, point, confidence_level };
-                }
-
-                double bias = normal_quantile(prob_n);
-                double z1 = normal_quantile((1. - confidence_level) / 2.);
-
-                auto cumn = [n]( double x ) -> long {
-                    return std::lround( normal_cdf( x ) * static_cast<double>(n) );
-                };
-                auto a = [bias, accel](double b) { return bias + b / (1. - accel * b); };
-                double b1 = bias + z1;
-                double b2 = bias - z1;
-                double a1 = a(b1);
-                double a2 = a(b2);
-                auto lo = static_cast<size_t>((std::max)(cumn(a1), 0l));
-                auto hi = static_cast<size_t>((std::min)(cumn(a2), n - 1));
-
-                return { point, resample[lo], resample[hi], confidence_level };
-            }
-
-            double outlier_variance(Estimate<double> mean, Estimate<double> stddev, int n);
 
             struct bootstrap_analysis {
                 Estimate<double> mean;
@@ -136,7 +49,10 @@ namespace Catch {
                 double outlier_variance;
             };
 
-            bootstrap_analysis analyse_samples(double confidence_level, unsigned int n_resamples, std::vector<double>::iterator first, std::vector<double>::iterator last);
+            bootstrap_analysis analyse_samples(double confidence_level,
+                                               unsigned int n_resamples,
+                                               double* first,
+                                               double* last);
         } // namespace Detail
     } // namespace Benchmark
 } // namespace Catch

src/catch2/benchmark/detail/catch_timing.hpp

@@ -17,14 +17,14 @@
 
 namespace Catch {
     namespace Benchmark {
-        template <typename Duration, typename Result>
+        template <typename Result>
         struct Timing {
-            Duration elapsed;
+            IDuration elapsed;
             Result result;
             int iterations;
         };
-        template <typename Clock, typename Func, typename... Args>
+        template <typename Func, typename... Args>
-        using TimingOf = Timing<ClockDuration<Clock>, Detail::CompleteType_t<FunctionReturnType<Func, Args...>>>;
+        using TimingOf = Timing<Detail::CompleteType_t<FunctionReturnType<Func, Args...>>>;
     } // namespace Benchmark
 } // namespace Catch
 

src/catch2/catch_all.hpp

@@ -54,6 +54,8 @@
 #include <catch2/internal/catch_compiler_capabilities.hpp>
 #include <catch2/internal/catch_config_android_logwrite.hpp>
 #include <catch2/internal/catch_config_counter.hpp>
+#include <catch2/internal/catch_config_prefix_messages.hpp>
+#include <catch2/internal/catch_config_static_analysis_support.hpp>
 #include <catch2/internal/catch_config_uncaught_exceptions.hpp>
 #include <catch2/internal/catch_config_wchar.hpp>
 #include <catch2/internal/catch_console_colour.hpp>
@@ -72,6 +74,7 @@
 #include <catch2/internal/catch_getenv.hpp>
 #include <catch2/internal/catch_is_permutation.hpp>
 #include <catch2/internal/catch_istream.hpp>
+#include <catch2/internal/catch_jsonwriter.hpp>
 #include <catch2/internal/catch_lazy_expr.hpp>
 #include <catch2/internal/catch_leak_detector.hpp>
 #include <catch2/internal/catch_list.hpp>
@@ -86,7 +89,10 @@
 #include <catch2/internal/catch_platform.hpp>
 #include <catch2/internal/catch_polyfills.hpp>
 #include <catch2/internal/catch_preprocessor.hpp>
+#include <catch2/internal/catch_preprocessor_internal_stringify.hpp>
 #include <catch2/internal/catch_preprocessor_remove_parens.hpp>
+#include <catch2/internal/catch_random_floating_point_helpers.hpp>
+#include <catch2/internal/catch_random_integer_helpers.hpp>
 #include <catch2/internal/catch_random_number_generator.hpp>
 #include <catch2/internal/catch_random_seed_generation.hpp>
 #include <catch2/internal/catch_reporter_registry.hpp>
@@ -111,10 +117,13 @@
 #include <catch2/internal/catch_test_failure_exception.hpp>
 #include <catch2/internal/catch_test_macro_impl.hpp>
 #include <catch2/internal/catch_test_registry.hpp>
+#include <catch2/internal/catch_test_run_info.hpp>
 #include <catch2/internal/catch_test_spec_parser.hpp>
 #include <catch2/internal/catch_textflow.hpp>
 #include <catch2/internal/catch_to_string.hpp>
 #include <catch2/internal/catch_uncaught_exceptions.hpp>
+#include <catch2/internal/catch_uniform_floating_point_distribution.hpp>
+#include <catch2/internal/catch_uniform_integer_distribution.hpp>
 #include <catch2/internal/catch_unique_name.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 #include <catch2/internal/catch_void_type.hpp>

src/catch2/catch_approx.cpp

@@ -70,10 +70,10 @@ namespace Catch {
     }
 
 namespace literals {
-    Approx operator "" _a(long double val) {
+    Approx operator ""_a(long double val) {
         return Approx(val);
     }
-    Approx operator "" _a(unsigned long long val) {
+    Approx operator ""_a(unsigned long long val) {
         return Approx(val);
     }
 } // end namespace literals

src/catch2/catch_config.cpp

@@ -105,7 +105,7 @@ namespace Catch {
             elem = trim(elem);
         }
 
-        // Insert the default reporter if user hasn't asked for a specfic one
+        // Insert the default reporter if user hasn't asked for a specific one
         if ( m_data.reporterSpecifications.empty() ) {
             m_data.reporterSpecifications.push_back( {
 #if defined( CATCH_CONFIG_DEFAULT_REPORTER )

src/catch2/catch_message.cpp

@@ -37,7 +37,11 @@ namespace Catch {
     }
 
 
-    Capturer::Capturer( StringRef macroName, SourceLineInfo const& lineInfo, ResultWas::OfType resultType, StringRef names ) {
+    Capturer::Capturer( StringRef macroName,
+                        SourceLineInfo const& lineInfo,
+                        ResultWas::OfType resultType,
+                        StringRef names ):
+        m_resultCapture( getResultCapture() ) {
         auto trimmed = [&] (size_t start, size_t end) {
             while (names[start] == ',' || isspace(static_cast<unsigned char>(names[start]))) {
                 ++start;

src/catch2/catch_message.hpp

@@ -8,12 +8,13 @@
 #ifndef CATCH_MESSAGE_HPP_INCLUDED
 #define CATCH_MESSAGE_HPP_INCLUDED
 
+#include <catch2/internal/catch_config_prefix_messages.hpp>
 #include <catch2/internal/catch_result_type.hpp>
 #include <catch2/internal/catch_reusable_string_stream.hpp>
 #include <catch2/internal/catch_stream_end_stop.hpp>
 #include <catch2/internal/catch_message_info.hpp>
-#include <catch2/interfaces/catch_interfaces_capture.hpp>
 #include <catch2/catch_tostring.hpp>
+#include <catch2/interfaces/catch_interfaces_capture.hpp>
 
 #include <string>
 #include <vector>
@@ -21,6 +22,7 @@
 namespace Catch {
 
     struct SourceLineInfo;
+    class IResultCapture;
 
     struct MessageStream {
 
@@ -61,7 +63,7 @@ namespace Catch {
 
     class Capturer {
         std::vector<MessageInfo> m_messages;
-        IResultCapture& m_resultCapture = getResultCapture();
+        IResultCapture& m_resultCapture;
         size_t m_captured = 0;
     public:
         Capturer( StringRef macroName, SourceLineInfo const& lineInfo, ResultWas::OfType resultType, StringRef names );
@@ -112,28 +114,28 @@ namespace Catch {
     Catch::getResultCapture().emplaceUnscopedMessage( Catch::MessageBuilder( macroName##_catch_sr, CATCH_INTERNAL_LINEINFO, Catch::ResultWas::Info ) << log )
 
 
-#if defined(CATCH_CONFIG_PREFIX_ALL) && !defined(CATCH_CONFIG_DISABLE)
+#if defined(CATCH_CONFIG_PREFIX_MESSAGES) && !defined(CATCH_CONFIG_DISABLE)
 
   #define CATCH_INFO( msg ) INTERNAL_CATCH_INFO( "CATCH_INFO", msg )
   #define CATCH_UNSCOPED_INFO( msg ) INTERNAL_CATCH_UNSCOPED_INFO( "CATCH_UNSCOPED_INFO", msg )
   #define CATCH_WARN( msg ) INTERNAL_CATCH_MSG( "CATCH_WARN", Catch::ResultWas::Warning, Catch::ResultDisposition::ContinueOnFailure, msg )
   #define CATCH_CAPTURE( ... ) INTERNAL_CATCH_CAPTURE( INTERNAL_CATCH_UNIQUE_NAME(capturer), "CATCH_CAPTURE", __VA_ARGS__ )
 
-#elif defined(CATCH_CONFIG_PREFIX_ALL) && defined(CATCH_CONFIG_DISABLE)
+#elif defined(CATCH_CONFIG_PREFIX_MESSAGES) && defined(CATCH_CONFIG_DISABLE)
 
   #define CATCH_INFO( msg )          (void)(0)
   #define CATCH_UNSCOPED_INFO( msg ) (void)(0)
   #define CATCH_WARN( msg )          (void)(0)
   #define CATCH_CAPTURE( ... )       (void)(0)
 
-#elif !defined(CATCH_CONFIG_PREFIX_ALL) && !defined(CATCH_CONFIG_DISABLE)
+#elif !defined(CATCH_CONFIG_PREFIX_MESSAGES) && !defined(CATCH_CONFIG_DISABLE)
 
   #define INFO( msg ) INTERNAL_CATCH_INFO( "INFO", msg )
   #define UNSCOPED_INFO( msg ) INTERNAL_CATCH_UNSCOPED_INFO( "UNSCOPED_INFO", msg )
   #define WARN( msg ) INTERNAL_CATCH_MSG( "WARN", Catch::ResultWas::Warning, Catch::ResultDisposition::ContinueOnFailure, msg )
   #define CAPTURE( ... ) INTERNAL_CATCH_CAPTURE( INTERNAL_CATCH_UNIQUE_NAME(capturer), "CAPTURE", __VA_ARGS__ )
 
-#elif !defined(CATCH_CONFIG_PREFIX_ALL) && defined(CATCH_CONFIG_DISABLE)
+#elif !defined(CATCH_CONFIG_PREFIX_MESSAGES) && defined(CATCH_CONFIG_DISABLE)
 
   #define INFO( msg )          (void)(0)
   #define UNSCOPED_INFO( msg ) (void)(0)

src/catch2/catch_registry_hub.cpp

@@ -20,6 +20,9 @@
 #include <catch2/internal/catch_noncopyable.hpp>
 #include <catch2/interfaces/catch_interfaces_reporter_factory.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
+#include <catch2/internal/catch_reporter_registry.hpp>
+
+#include <exception>
 
 namespace Catch {
 
@@ -31,7 +34,7 @@ namespace Catch {
 
         public: // IRegistryHub
             RegistryHub() = default;
-            IReporterRegistry const& getReporterRegistry() const override {
+            ReporterRegistry const& getReporterRegistry() const override {
                 return m_reporterRegistry;
             }
             ITestCaseRegistry const& getTestCaseRegistry() const override {

src/catch2/catch_session.cpp

@@ -13,13 +13,13 @@
 #include <catch2/internal/catch_run_context.hpp>
 #include <catch2/catch_test_spec.hpp>
 #include <catch2/catch_version.hpp>
-#include <catch2/interfaces/catch_interfaces_reporter.hpp>
 #include <catch2/internal/catch_startup_exception_registry.hpp>
 #include <catch2/internal/catch_sharding.hpp>
+#include <catch2/internal/catch_test_case_registry_impl.hpp>
 #include <catch2/internal/catch_textflow.hpp>
 #include <catch2/internal/catch_windows_h_proxy.hpp>
 #include <catch2/reporters/catch_reporter_multi.hpp>
-#include <catch2/interfaces/catch_interfaces_reporter_registry.hpp>
+#include <catch2/internal/catch_reporter_registry.hpp>
 #include <catch2/interfaces/catch_interfaces_reporter_factory.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 #include <catch2/internal/catch_stdstreams.hpp>
@@ -27,6 +27,7 @@
 
 #include <algorithm>
 #include <cassert>
+#include <exception>
 #include <iomanip>
 #include <set>
 

src/catch2/catch_test_case_info.cpp

@@ -9,6 +9,7 @@
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/internal/catch_string_manip.hpp>
 #include <catch2/internal/catch_case_insensitive_comparisons.hpp>
+#include <catch2/internal/catch_test_registry.hpp>
 
 #include <cassert>
 #include <cctype>
@@ -139,12 +140,20 @@ namespace Catch {
         for (size_t idx = 0; idx < originalTags.size(); ++idx) {
             auto c = originalTags[idx];
             if (c == '[') {
-                assert(!inTag);
+                CATCH_ENFORCE(
+                    !inTag,
+                    "Found '[' inside a tag while registering test case '"
+                        << _nameAndTags.name << "' at " << _lineInfo );
+
                 inTag = true;
                 tagStart = idx;
             }
             if (c == ']') {
-                assert(inTag);
+                CATCH_ENFORCE(
+                    inTag,
+                    "Found unmatched ']' while registering test case '"
+                        << _nameAndTags.name << "' at " << _lineInfo );
+
                 inTag = false;
                 tagEnd = idx;
                 assert(tagStart < tagEnd);
@@ -153,7 +162,11 @@ namespace Catch {
                 // it over to backing storage and actually reference the
                 // backing storage in the saved tags
                 StringRef tagStr = originalTags.substr(tagStart+1, tagEnd - tagStart - 1);
-                CATCH_ENFORCE(!tagStr.empty(), "Empty tags are not allowed");
+                CATCH_ENFORCE( !tagStr.empty(),
+                               "Found an empty tag while registering test case '"
+                                   << _nameAndTags.name << "' at "
+                                   << _lineInfo );
+
                 enforceNotReservedTag(tagStr, lineInfo);
                 properties |= parseSpecialTag(tagStr);
                 // When copying a tag to the backing storage, we need to
@@ -167,8 +180,12 @@ namespace Catch {
                 // the tags.
                 internalAppendTag(tagStr);
             }
-            (void)inTag; // Silence "set-but-unused" warning in release mode.
         }
+        CATCH_ENFORCE( !inTag,
+                       "Found an unclosed tag while registering test case '"
+                           << _nameAndTags.name << "' at " << _lineInfo );
+
+
         // Add [.] if relevant
         if (isHidden()) {
             internalAppendTag("."_sr);

src/catch2/catch_test_case_info.hpp

@@ -8,10 +8,10 @@
 #ifndef CATCH_TEST_CASE_INFO_HPP_INCLUDED
 #define CATCH_TEST_CASE_INFO_HPP_INCLUDED
 
+#include <catch2/interfaces/catch_interfaces_test_invoker.hpp>
 #include <catch2/internal/catch_source_line_info.hpp>
 #include <catch2/internal/catch_noncopyable.hpp>
 #include <catch2/internal/catch_stringref.hpp>
-#include <catch2/internal/catch_test_registry.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 
 
@@ -44,6 +44,7 @@ namespace Catch {
     };
 
     class ITestInvoker;
+    struct NameAndTags;
 
     enum class TestCaseProperties : uint8_t {
         None = 0,

src/catch2/catch_test_spec.cpp

@@ -6,6 +6,8 @@
 
 // SPDX-License-Identifier: BSL-1.0
 #include <catch2/catch_test_spec.hpp>
+#include <catch2/interfaces/catch_interfaces_testcase.hpp>
+#include <catch2/internal/catch_test_case_registry_impl.hpp>
 #include <catch2/internal/catch_reusable_string_stream.hpp>
 #include <catch2/internal/catch_string_manip.hpp>
 #include <catch2/catch_test_case_info.hpp>
@@ -106,16 +108,18 @@ namespace Catch {
         return std::any_of( m_filters.begin(), m_filters.end(), [&]( Filter const& f ){ return f.matches( testCase ); } );
     }
 
-    TestSpec::Matches TestSpec::matchesByFilter( std::vector<TestCaseHandle> const& testCases, IConfig const& config ) const
+    TestSpec::Matches TestSpec::matchesByFilter( std::vector<TestCaseHandle> const& testCases, IConfig const& config ) const {
-    {
+        Matches matches;
-        Matches matches( m_filters.size() );
+        matches.reserve( m_filters.size() );
-        std::transform( m_filters.begin(), m_filters.end(), matches.begin(), [&]( Filter const& filter ){
+        for ( auto const& filter : m_filters ) {
             std::vector<TestCaseHandle const*> currentMatches;
-            for( auto const& test : testCases )
+            for ( auto const& test : testCases )
-                if( isThrowSafe( test, config ) && filter.matches( test.getTestCaseInfo() ) )
+                if ( isThrowSafe( test, config ) &&
+                     filter.matches( test.getTestCaseInfo() ) )
                     currentMatches.emplace_back( &test );
-            return FilterMatch{ extractFilterName(filter), currentMatches };
+            matches.push_back(
-        } );
+                FilterMatch{ extractFilterName( filter ), currentMatches } );
+        }
         return matches;
     }
 

src/catch2/catch_tostring.hpp

@@ -116,7 +116,6 @@ namespace Catch {
     } // namespace Detail
 
 
-    // If we decide for C++14, change these to enable_if_ts
     template <typename T, typename = void>
     struct StringMaker {
         template <typename Fake = T>
@@ -399,6 +398,12 @@ namespace Catch {
             }
         }
     };
+    template <>
+    struct StringMaker<std::nullopt_t> {
+        static std::string convert(const std::nullopt_t&) {
+            return "{ }";
+        }
+    };
 }
 #endif // CATCH_CONFIG_ENABLE_OPTIONAL_STRINGMAKER
 

src/catch2/catch_translate_exception.cpp

@@ -0,0 +1,20 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
+#include <catch2/catch_translate_exception.hpp>
+#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+
+namespace Catch {
+    namespace Detail {
+        void registerTranslatorImpl(
+            Detail::unique_ptr<IExceptionTranslator>&& translator ) {
+            getMutableRegistryHub().registerTranslator(
+                CATCH_MOVE( translator ) );
+        }
+    } // namespace Detail
+} // namespace Catch

src/catch2/catch_translate_exception.hpp

@@ -15,6 +15,10 @@
 #include <exception>
 
 namespace Catch {
+    namespace Detail {
+        void registerTranslatorImpl(
+            Detail::unique_ptr<IExceptionTranslator>&& translator );
+    }
 
     class ExceptionTranslatorRegistrar {
         template<typename T>
@@ -48,9 +52,9 @@ namespace Catch {
     public:
         template<typename T>
         ExceptionTranslatorRegistrar( std::string(*translateFunction)( T const& ) ) {
-            getMutableRegistryHub().registerTranslator(
+            Detail::registerTranslatorImpl(
-                Detail::make_unique<ExceptionTranslator<T>>(translateFunction)
+                Detail::make_unique<ExceptionTranslator<T>>(
-            );
+                    translateFunction ) );
         }
     };
 

src/catch2/catch_user_config.hpp.in

@@ -169,9 +169,18 @@
 #endif
 
 
+#cmakedefine CATCH_CONFIG_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT
+#cmakedefine CATCH_CONFIG_NO_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT
+
+#if defined( CATCH_CONFIG_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT ) && \
+    defined( CATCH_CONFIG_NO_EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT )
+#    error Cannot force STATIC_ANALYSIS_SUPPORT to both ON and OFF
+#endif
+
+
 // ------
 // Simple toggle defines
-// their value is never used and they cannot be overriden
+// their value is never used and they cannot be overridden
 // ------
 
 
@@ -189,6 +198,7 @@
 #cmakedefine CATCH_CONFIG_FAST_COMPILE
 #cmakedefine CATCH_CONFIG_NOSTDOUT
 #cmakedefine CATCH_CONFIG_PREFIX_ALL
+#cmakedefine CATCH_CONFIG_PREFIX_MESSAGES
 #cmakedefine CATCH_CONFIG_WINDOWS_CRTDBG
 
 #cmakedefine CATCH_CONFIG_SHARED_LIBRARY

src/catch2/catch_version.cpp

@@ -36,7 +36,7 @@ namespace Catch {
     }
 
     Version const& libraryVersion() {
-        static Version version( 3, 3, 2, "", 0 );
+        static Version version( 3, 5, 0, "", 0 );
         return version;
     }
 

src/catch2/catch_version_macros.hpp

@@ -9,7 +9,7 @@
 #define CATCH_VERSION_MACROS_HPP_INCLUDED
 
 #define CATCH_VERSION_MAJOR 3
-#define CATCH_VERSION_MINOR 3
+#define CATCH_VERSION_MINOR 5
-#define CATCH_VERSION_PATCH 2
+#define CATCH_VERSION_PATCH 0
 
 #endif // CATCH_VERSION_MACROS_HPP_INCLUDED