WIP: devirtualize RunContext

I also made a bunch of refactorings around the headers and includes
to simplify the main include path.

CMakeLists.txt

@@ -148,6 +148,8 @@ if (NOT_SUBPROJECT)
             "extras/ParseAndAddCatchTests.cmake"
             "extras/Catch.cmake"
             "extras/CatchAddTests.cmake"
+            "extras/CatchShardTests.cmake"
+            "extras/CatchShardTestsImpl.cmake"
           DESTINATION
             ${CATCH_CMAKE_CONFIG_DESTINATION}
         )

WORKSPACE.bazel

@@ -4,12 +4,13 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 http_archive(
     name = "bazel_skylib",
+    sha256 = "b8a1527901774180afc798aeb28c4634bdccf19c4d98e7bdd1ce79d1fe9aaad7",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.3.0/bazel-skylib-1.3.0.tar.gz",
-        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.3.0/bazel-skylib-1.3.0.tar.gz",
+        "https://mirror.bazel.build/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/1.4.1/bazel-skylib-1.4.1.tar.gz",
     ],
-    sha256 = "74d544d96f4a5bb630d465ca8bbcfe231e3594e5aae57e1edbf17a6eb3ca2506",
 )
 
 load("@bazel_skylib//:workspace.bzl", "bazel_skylib_workspace")
+
 bazel_skylib_workspace()

docs/opensource-users.md

@@ -110,6 +110,12 @@ A header-only TOML parser and serializer for modern C++.
 ### [Trompeloeil](https://github.com/rollbear/trompeloeil)
 A thread-safe header-only mocking framework for C++14.
 
+### [wxWidgets](https://www.wxwidgets.org/)
+Cross-Platform C++ GUI Library.
+
+### [xmlwrapp](https://github.com/vslavik/xmlwrapp)
+C++ XML parsing library using libxml2.
+
 ## Applications & Tools
 
 ### [App Mesh](https://github.com/laoshanxi/app-mesh)

extras/CatchShardTests.cmake

@@ -46,7 +46,7 @@ function(catch_add_sharded_tests TARGET)
     APPEND PROPERTY TEST_INCLUDE_FILES "${ctest_include_file}"
   )
 
-  set(shard_impl_script_file "${CMAKE_CURRENT_LIST_DIR}/CatchShardTestsImpl.cmake")
+  set(shard_impl_script_file "${_CATCH_DISCOVER_SHARD_TESTS_IMPL_SCRIPT}")
 
   add_custom_command(
     TARGET ${TARGET} POST_BUILD
@@ -64,3 +64,11 @@ function(catch_add_sharded_tests TARGET)
 
 
 endfunction()
+
+
+###############################################################################
+
+set(_CATCH_DISCOVER_SHARD_TESTS_IMPL_SCRIPT
+    ${CMAKE_CURRENT_LIST_DIR}/CatchShardTestsImpl.cmake
+  CACHE INTERNAL "Catch2 full path to CatchShardTestsImpl.cmake helper file"
+)

src/CMakeLists.txt

@@ -55,6 +55,7 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/catch_template_test_macros.hpp
   ${SOURCES_DIR}/catch_test_case_info.hpp
   ${SOURCES_DIR}/catch_test_macros.hpp
+  ${SOURCES_DIR}/catch_test_run_info.hpp
   ${SOURCES_DIR}/catch_test_spec.hpp
   ${SOURCES_DIR}/catch_timer.hpp
   ${SOURCES_DIR}/catch_tostring.hpp
@@ -63,6 +64,7 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/catch_version.hpp
   ${SOURCES_DIR}/catch_version_macros.hpp
   ${SOURCES_DIR}/internal/catch_assertion_handler.hpp
+  ${SOURCES_DIR}/internal/catch_benchmark_stats_fwd.hpp
   ${SOURCES_DIR}/internal/catch_case_insensitive_comparisons.hpp
   ${SOURCES_DIR}/internal/catch_case_sensitive.hpp
   ${SOURCES_DIR}/internal/catch_clara.hpp
@@ -106,6 +108,7 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_preprocessor_remove_parens.hpp
   ${SOURCES_DIR}/internal/catch_random_number_generator.hpp
   ${SOURCES_DIR}/internal/catch_random_seed_generation.hpp
+  ${SOURCES_DIR}/internal/catch_registry_hub.hpp
   ${SOURCES_DIR}/internal/catch_reporter_registry.hpp
   ${SOURCES_DIR}/internal/catch_reporter_spec_parser.hpp
   ${SOURCES_DIR}/internal/catch_result_type.hpp
@@ -145,7 +148,6 @@ set(IMPL_SOURCES
   ${SOURCES_DIR}/catch_config.cpp
   ${SOURCES_DIR}/catch_get_random_seed.cpp
   ${SOURCES_DIR}/catch_message.cpp
-  ${SOURCES_DIR}/catch_registry_hub.cpp
   ${SOURCES_DIR}/catch_session.cpp
   ${SOURCES_DIR}/catch_tag_alias_autoregistrar.cpp
   ${SOURCES_DIR}/catch_test_case_info.cpp
@@ -153,6 +155,7 @@ 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
@@ -180,6 +183,7 @@ set(IMPL_SOURCES
   ${SOURCES_DIR}/internal/catch_polyfills.cpp
   ${SOURCES_DIR}/internal/catch_random_number_generator.cpp
   ${SOURCES_DIR}/internal/catch_random_seed_generation.cpp
+  ${SOURCES_DIR}/internal/catch_registry_hub.cpp
   ${SOURCES_DIR}/internal/catch_reporter_registry.cpp
   ${SOURCES_DIR}/internal/catch_reporter_spec_parser.cpp
   ${SOURCES_DIR}/internal/catch_result_type.cpp
@@ -208,27 +212,19 @@ set(INTERNAL_FILES ${IMPL_SOURCES} ${IMPL_HEADERS})
 
 set(INTERFACE_HEADERS
   ${SOURCES_DIR}/interfaces/catch_interfaces_all.hpp
-  ${SOURCES_DIR}/interfaces/catch_interfaces_capture.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_config.hpp
-  ${SOURCES_DIR}/interfaces/catch_interfaces_enum_values_registry.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_exception.hpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_generatortracker.hpp
-  ${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_testcase.hpp
 )
 set(INTERFACE_SOURCES
-  ${SOURCES_DIR}/interfaces/catch_interfaces_capture.cpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_config.cpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_exception.cpp
   ${SOURCES_DIR}/interfaces/catch_interfaces_generatortracker.cpp
-  ${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})

src/catch2/benchmark/catch_benchmark.hpp

@@ -11,9 +11,11 @@
 #define CATCH_BENCHMARK_HPP_INCLUDED
 
 #include <catch2/interfaces/catch_interfaces_config.hpp>
+#include <catch2/interfaces/catch_interfaces_reporter.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_run_context.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 #include <catch2/internal/catch_unique_name.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 #include <catch2/benchmark/catch_chronometer.hpp>
@@ -26,6 +28,7 @@
 #include <catch2/benchmark/detail/catch_benchmark_function.hpp>
 #include <catch2/benchmark/detail/catch_run_for_at_least.hpp>
 
+
 #include <algorithm>
 #include <functional>
 #include <string>

src/catch2/benchmark/catch_optimizer.hpp

@@ -10,7 +10,7 @@
 #ifndef CATCH_OPTIMIZER_HPP_INCLUDED
 #define CATCH_OPTIMIZER_HPP_INCLUDED
 
-#if defined(_MSC_VER)
+#if defined(_MSC_VER) || defined(__IAR_SYSTEMS_ICC__)
 #   include <atomic> // atomic_thread_fence
 #endif
 
@@ -32,16 +32,23 @@ namespace Catch {
         namespace Detail {
             inline void optimizer_barrier() { keep_memory(); }
         } // namespace Detail
-#elif defined(_MSC_VER)
+#elif defined(_MSC_VER) || defined(__IAR_SYSTEMS_ICC__)
 
+#if defined(_MSVC_VER)
 #pragma optimize("", off)
+#elif defined(__IAR_SYSTEMS_ICC__)
+// For IAR the pragma only affects the following function
+#pragma optimize=disable
+#endif
         template <typename T>
         inline void keep_memory(T* p) {
             // thanks @milleniumbug
             *reinterpret_cast<char volatile*>(p) = *reinterpret_cast<char const volatile*>(p);
         }
         // TODO equivalent keep_memory()
+#if defined(_MSVC_VER)
 #pragma optimize("", on)
+#endif
 
         namespace Detail {
             inline void optimizer_barrier() {

src/catch2/benchmark/detail/catch_complete_invoke.hpp

@@ -12,8 +12,6 @@
 
 #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>

src/catch2/catch_all.hpp

@@ -36,6 +36,7 @@
 #include <catch2/catch_template_test_macros.hpp>
 #include <catch2/catch_test_case_info.hpp>
 #include <catch2/catch_test_macros.hpp>
+#include <catch2/catch_test_run_info.hpp>
 #include <catch2/catch_test_spec.hpp>
 #include <catch2/catch_timer.hpp>
 #include <catch2/catch_tostring.hpp>
@@ -46,6 +47,7 @@
 #include <catch2/generators/catch_generators_all.hpp>
 #include <catch2/interfaces/catch_interfaces_all.hpp>
 #include <catch2/internal/catch_assertion_handler.hpp>
+#include <catch2/internal/catch_benchmark_stats_fwd.hpp>
 #include <catch2/internal/catch_case_insensitive_comparisons.hpp>
 #include <catch2/internal/catch_case_sensitive.hpp>
 #include <catch2/internal/catch_clara.hpp>
@@ -89,6 +91,7 @@
 #include <catch2/internal/catch_preprocessor_remove_parens.hpp>
 #include <catch2/internal/catch_random_number_generator.hpp>
 #include <catch2/internal/catch_random_seed_generation.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 #include <catch2/internal/catch_reporter_registry.hpp>
 #include <catch2/internal/catch_reporter_spec_parser.hpp>
 #include <catch2/internal/catch_result_type.hpp>

src/catch2/catch_config.cpp

@@ -13,7 +13,7 @@
 #include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_string_manip.hpp>
 #include <catch2/internal/catch_test_spec_parser.hpp>
-#include <catch2/interfaces/catch_interfaces_tag_alias_registry.hpp>
+#include <catch2/internal/catch_tag_alias_registry.hpp>
 #include <catch2/internal/catch_getenv.hpp>
 
 #include <fstream>
@@ -123,7 +123,7 @@ namespace Catch {
 
         // Bazel support can modify the test specs, so parsing has to happen
         // after reading Bazel env vars.
-        TestSpecParser parser( ITagAliasRegistry::get() );
+        TestSpecParser parser( TagAliasRegistry::get() );
         if ( !m_data.testsOrTags.empty() ) {
             m_hasTestFilters = true;
             for ( auto const& testOrTags : m_data.testsOrTags ) {

src/catch2/catch_message.cpp

@@ -6,10 +6,10 @@
 
 // SPDX-License-Identifier: BSL-1.0
 #include <catch2/catch_message.hpp>
-#include <catch2/interfaces/catch_interfaces_capture.hpp>
 #include <catch2/internal/catch_uncaught_exceptions.hpp>
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
+#include <catch2/internal/catch_run_context.hpp>
 
 #include <cassert>
 #include <stack>

src/catch2/catch_message.hpp

@@ -12,7 +12,7 @@
 #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/internal/catch_run_context.hpp>
 #include <catch2/catch_tostring.hpp>
 
 #include <string>
@@ -61,7 +61,7 @@ namespace Catch {
 
     class Capturer {
         std::vector<MessageInfo> m_messages;
-        IResultCapture& m_resultCapture = getResultCapture();
+        RunContext& m_resultCapture = getResultCapture();
         size_t m_captured = 0;
     public:
         Capturer( StringRef macroName, SourceLineInfo const& lineInfo, ResultWas::OfType resultType, StringRef names );

src/catch2/catch_registry_hub.cpp

@@ -1,104 +0,0 @@
-
-//              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
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
-
-#include <catch2/internal/catch_context.hpp>
-#include <catch2/internal/catch_enforce.hpp>
-#include <catch2/internal/catch_test_case_registry_impl.hpp>
-#include <catch2/internal/catch_reporter_registry.hpp>
-#include <catch2/internal/catch_exception_translator_registry.hpp>
-#include <catch2/internal/catch_tag_alias_registry.hpp>
-#include <catch2/internal/catch_startup_exception_registry.hpp>
-#include <catch2/internal/catch_singletons.hpp>
-#include <catch2/internal/catch_enum_values_registry.hpp>
-#include <catch2/catch_test_case_info.hpp>
-#include <catch2/internal/catch_noncopyable.hpp>
-#include <catch2/interfaces/catch_interfaces_reporter_factory.hpp>
-#include <catch2/internal/catch_move_and_forward.hpp>
-
-namespace Catch {
-
-    namespace {
-
-        class RegistryHub : public IRegistryHub,
-                            public IMutableRegistryHub,
-                            private Detail::NonCopyable {
-
-        public: // IRegistryHub
-            RegistryHub() = default;
-            IReporterRegistry const& getReporterRegistry() const override {
-                return m_reporterRegistry;
-            }
-            ITestCaseRegistry const& getTestCaseRegistry() const override {
-                return m_testCaseRegistry;
-            }
-            IExceptionTranslatorRegistry const& getExceptionTranslatorRegistry() const override {
-                return m_exceptionTranslatorRegistry;
-            }
-            ITagAliasRegistry const& getTagAliasRegistry() const override {
-                return m_tagAliasRegistry;
-            }
-            StartupExceptionRegistry const& getStartupExceptionRegistry() const override {
-                return m_exceptionRegistry;
-            }
-
-        public: // IMutableRegistryHub
-            void registerReporter( std::string const& name, IReporterFactoryPtr factory ) override {
-                m_reporterRegistry.registerReporter( name, CATCH_MOVE(factory) );
-            }
-            void registerListener( Detail::unique_ptr<EventListenerFactory> factory ) override {
-                m_reporterRegistry.registerListener( CATCH_MOVE(factory) );
-            }
-            void registerTest( Detail::unique_ptr<TestCaseInfo>&& testInfo, Detail::unique_ptr<ITestInvoker>&& invoker ) override {
-                m_testCaseRegistry.registerTest( CATCH_MOVE(testInfo), CATCH_MOVE(invoker) );
-            }
-            void registerTranslator( Detail::unique_ptr<IExceptionTranslator>&& translator ) override {
-                m_exceptionTranslatorRegistry.registerTranslator( CATCH_MOVE(translator) );
-            }
-            void registerTagAlias( std::string const& alias, std::string const& tag, SourceLineInfo const& lineInfo ) override {
-                m_tagAliasRegistry.add( alias, tag, lineInfo );
-            }
-            void registerStartupException() noexcept override {
-#if !defined(CATCH_CONFIG_DISABLE_EXCEPTIONS)
-                m_exceptionRegistry.add(std::current_exception());
-#else
-                CATCH_INTERNAL_ERROR("Attempted to register active exception under CATCH_CONFIG_DISABLE_EXCEPTIONS!");
-#endif
-            }
-            IMutableEnumValuesRegistry& getMutableEnumValuesRegistry() override {
-                return m_enumValuesRegistry;
-            }
-
-        private:
-            TestRegistry m_testCaseRegistry;
-            ReporterRegistry m_reporterRegistry;
-            ExceptionTranslatorRegistry m_exceptionTranslatorRegistry;
-            TagAliasRegistry m_tagAliasRegistry;
-            StartupExceptionRegistry m_exceptionRegistry;
-            Detail::EnumValuesRegistry m_enumValuesRegistry;
-        };
-    }
-
-    using RegistryHubSingleton = Singleton<RegistryHub, IRegistryHub, IMutableRegistryHub>;
-
-    IRegistryHub const& getRegistryHub() {
-        return RegistryHubSingleton::get();
-    }
-    IMutableRegistryHub& getMutableRegistryHub() {
-        return RegistryHubSingleton::getMutable();
-    }
-    void cleanUp() {
-        cleanupSingletons();
-        cleanUpContext();
-    }
-    std::string translateActiveException() {
-        return getRegistryHub().getExceptionTranslatorRegistry().translateActiveException();
-    }
-
-
-} // end namespace Catch

src/catch2/catch_session.cpp

@@ -19,11 +19,14 @@
 #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>
 #include <catch2/internal/catch_istream.hpp>
+#include <catch2/internal/catch_test_case_registry_impl.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
+#include <catch2/catch_test_case_info.hpp>
 
 #include <algorithm>
 #include <cassert>

src/catch2/catch_tag_alias_autoregistrar.cpp

@@ -8,7 +8,7 @@
 
 #include <catch2/catch_tag_alias_autoregistrar.hpp>
 #include <catch2/internal/catch_compiler_capabilities.hpp>
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 
 namespace Catch {
 

src/catch2/catch_test_run_info.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_TEST_RUN_INFO_HPP_INCLUDED
+#define CATCH_TEST_RUN_INFO_HPP_INCLUDED
+
+#include <catch2/internal/catch_stringref.hpp>
+
+namespace Catch {
+
+    struct TestRunInfo {
+        constexpr TestRunInfo(StringRef _name) : name(_name) {}
+        StringRef name;
+    };
+
+
+} // end namespace Catch
+
+#endif // CATCH_TEST_RUN_INFO_HPP_INCLUDED

src/catch2/catch_test_spec.cpp

@@ -8,6 +8,7 @@
 #include <catch2/catch_test_spec.hpp>
 #include <catch2/internal/catch_reusable_string_stream.hpp>
 #include <catch2/internal/catch_string_manip.hpp>
+#include <catch2/internal/catch_test_case_registry_impl.hpp>
 #include <catch2/catch_test_case_info.hpp>
 
 #include <algorithm>

src/catch2/catch_tostring.hpp

@@ -16,9 +16,9 @@
 
 #include <catch2/internal/catch_compiler_capabilities.hpp>
 #include <catch2/internal/catch_config_wchar.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_reusable_string_stream.hpp>
 #include <catch2/internal/catch_void_type.hpp>
-#include <catch2/interfaces/catch_interfaces_enum_values_registry.hpp>
 
 #ifdef CATCH_CONFIG_CPP17_STRING_VIEW
 #include <string_view>
@@ -648,7 +648,7 @@ struct ratio_string<std::milli> {
     };
 }
 
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 
 #define INTERNAL_CATCH_REGISTER_ENUM( enumName, ... ) \
 namespace Catch { \

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/internal/catch_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 +52,8 @@ namespace Catch {
     public:
         template<typename T>
         ExceptionTranslatorRegistrar( std::string(*translateFunction)( T const& ) ) {
-            getMutableRegistryHub().registerTranslator(
-                Detail::make_unique<ExceptionTranslator<T>>(translateFunction)
-            );
+            Detail::registerTranslatorImpl( Detail::make_unique<ExceptionTranslator<T>>(
+                translateFunction ) );
         }
     };
 

src/catch2/generators/catch_generators.cpp

@@ -9,7 +9,7 @@
 #include <catch2/generators/catch_generators.hpp>
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/generators/catch_generator_exception.hpp>
-#include <catch2/interfaces/catch_interfaces_capture.hpp>
+#include <catch2/internal/catch_run_context.hpp>
 
 namespace Catch {
 

src/catch2/interfaces/catch_interfaces_all.hpp

@@ -22,16 +22,11 @@
 #ifndef CATCH_INTERFACES_ALL_HPP_INCLUDED
 #define CATCH_INTERFACES_ALL_HPP_INCLUDED
 
-#include <catch2/interfaces/catch_interfaces_capture.hpp>
 #include <catch2/interfaces/catch_interfaces_config.hpp>
-#include <catch2/interfaces/catch_interfaces_enum_values_registry.hpp>
 #include <catch2/interfaces/catch_interfaces_exception.hpp>
 #include <catch2/interfaces/catch_interfaces_generatortracker.hpp>
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
 #include <catch2/interfaces/catch_interfaces_reporter.hpp>
 #include <catch2/interfaces/catch_interfaces_reporter_factory.hpp>
-#include <catch2/interfaces/catch_interfaces_reporter_registry.hpp>
-#include <catch2/interfaces/catch_interfaces_tag_alias_registry.hpp>
 #include <catch2/interfaces/catch_interfaces_testcase.hpp>
 
 #endif // CATCH_INTERFACES_ALL_HPP_INCLUDED

src/catch2/interfaces/catch_interfaces_capture.cpp

@@ -1,13 +0,0 @@
-
-//              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
-
-#include <catch2/interfaces/catch_interfaces_capture.hpp>
-
-namespace Catch {
-    IResultCapture::~IResultCapture() = default;
-}

src/catch2/interfaces/catch_interfaces_capture.hpp

@@ -1,110 +0,0 @@
-
-//              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
-#ifndef CATCH_INTERFACES_CAPTURE_HPP_INCLUDED
-#define CATCH_INTERFACES_CAPTURE_HPP_INCLUDED
-
-#include <string>
-#include <chrono>
-
-#include <catch2/internal/catch_stringref.hpp>
-#include <catch2/internal/catch_result_type.hpp>
-#include <catch2/internal/catch_unique_ptr.hpp>
-
-namespace Catch {
-
-    class AssertionResult;
-    struct AssertionInfo;
-    struct SectionInfo;
-    struct SectionEndInfo;
-    struct MessageInfo;
-    struct MessageBuilder;
-    struct Counts;
-    struct AssertionReaction;
-    struct SourceLineInfo;
-
-    class ITransientExpression;
-    class IGeneratorTracker;
-
-    struct BenchmarkInfo;
-    template <typename Duration = std::chrono::duration<double, std::nano>>
-    struct BenchmarkStats;
-
-    namespace Generators {
-        class GeneratorUntypedBase;
-        using GeneratorBasePtr = Catch::Detail::unique_ptr<GeneratorUntypedBase>;
-    }
-
-
-    class IResultCapture {
-    public:
-        virtual ~IResultCapture();
-
-        virtual bool sectionStarted( StringRef sectionName,
-                                     SourceLineInfo const& sectionLineInfo,
-                                     Counts& assertions ) = 0;
-        virtual void sectionEnded( SectionEndInfo&& endInfo ) = 0;
-        virtual void sectionEndedEarly( SectionEndInfo&& endInfo ) = 0;
-
-        virtual IGeneratorTracker*
-        acquireGeneratorTracker( StringRef generatorName,
-                                 SourceLineInfo const& lineInfo ) = 0;
-        virtual IGeneratorTracker*
-        createGeneratorTracker( StringRef generatorName,
-                                SourceLineInfo lineInfo,
-                                Generators::GeneratorBasePtr&& generator ) = 0;
-
-        virtual void benchmarkPreparing( StringRef name ) = 0;
-        virtual void benchmarkStarting( BenchmarkInfo const& info ) = 0;
-        virtual void benchmarkEnded( BenchmarkStats<> const& stats ) = 0;
-        virtual void benchmarkFailed( StringRef error ) = 0;
-
-        virtual void pushScopedMessage( MessageInfo const& message ) = 0;
-        virtual void popScopedMessage( MessageInfo const& message ) = 0;
-
-        virtual void emplaceUnscopedMessage( MessageBuilder&& builder ) = 0;
-
-        virtual void handleFatalErrorCondition( StringRef message ) = 0;
-
-        virtual void handleExpr
-                (   AssertionInfo const& info,
-                    ITransientExpression const& expr,
-                    AssertionReaction& reaction ) = 0;
-        virtual void handleMessage
-                (   AssertionInfo const& info,
-                    ResultWas::OfType resultType,
-                    StringRef message,
-                    AssertionReaction& reaction ) = 0;
-        virtual void handleUnexpectedExceptionNotThrown
-                (   AssertionInfo const& info,
-                    AssertionReaction& reaction ) = 0;
-        virtual void handleUnexpectedInflightException
-                (   AssertionInfo const& info,
-                    std::string const& message,
-                    AssertionReaction& reaction ) = 0;
-        virtual void handleIncomplete
-                (   AssertionInfo const& info ) = 0;
-        virtual void handleNonExpr
-                (   AssertionInfo const &info,
-                    ResultWas::OfType resultType,
-                    AssertionReaction &reaction ) = 0;
-
-
-
-        virtual bool lastAssertionPassed() = 0;
-        virtual void assertionPassed() = 0;
-
-        // Deprecated, do not use:
-        virtual std::string getCurrentTestName() const = 0;
-        virtual const AssertionResult* getLastResult() const = 0;
-        virtual void exceptionEarlyReported() = 0;
-    };
-
-    IResultCapture& getResultCapture();
-}
-
-#endif // CATCH_INTERFACES_CAPTURE_HPP_INCLUDED

src/catch2/interfaces/catch_interfaces_enum_values_registry.hpp

@@ -1,47 +0,0 @@
-
-//              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
-#ifndef CATCH_INTERFACES_ENUM_VALUES_REGISTRY_HPP_INCLUDED
-#define CATCH_INTERFACES_ENUM_VALUES_REGISTRY_HPP_INCLUDED
-
-#include <catch2/internal/catch_stringref.hpp>
-
-#include <vector>
-
-namespace Catch {
-
-    namespace Detail {
-        struct EnumInfo {
-            StringRef m_name;
-            std::vector<std::pair<int, StringRef>> m_values;
-
-            ~EnumInfo();
-
-            StringRef lookup( int value ) const;
-        };
-    } // namespace Detail
-
-    class IMutableEnumValuesRegistry {
-    public:
-        virtual ~IMutableEnumValuesRegistry(); // = default;
-
-        virtual Detail::EnumInfo const& registerEnum( StringRef enumName, StringRef allEnums, std::vector<int> const& values ) = 0;
-
-        template<typename E>
-        Detail::EnumInfo const& registerEnum( StringRef enumName, StringRef allEnums, std::initializer_list<E> values ) {
-            static_assert(sizeof(int) >= sizeof(E), "Cannot serialize enum to int");
-            std::vector<int> intValues;
-            intValues.reserve( values.size() );
-            for( auto enumValue : values )
-                intValues.push_back( static_cast<int>( enumValue ) );
-            return registerEnum( enumName, allEnums, intValues );
-        }
-    };
-
-} // Catch
-
-#endif // CATCH_INTERFACES_ENUM_VALUES_REGISTRY_HPP_INCLUDED

src/catch2/interfaces/catch_interfaces_exception.cpp

@@ -10,5 +10,4 @@
 
 namespace Catch {
     IExceptionTranslator::~IExceptionTranslator() = default;
-    IExceptionTranslatorRegistry::~IExceptionTranslatorRegistry() = default;
 }

src/catch2/interfaces/catch_interfaces_exception.hpp

@@ -8,15 +8,12 @@
 #ifndef CATCH_INTERFACES_EXCEPTION_HPP_INCLUDED
 #define CATCH_INTERFACES_EXCEPTION_HPP_INCLUDED
 
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 
 #include <string>
 #include <vector>
 
 namespace Catch {
-    using exceptionTranslateFunction = std::string(*)();
-
     class IExceptionTranslator;
     using ExceptionTranslators = std::vector<Detail::unique_ptr<IExceptionTranslator const>>;
 
@@ -26,12 +23,6 @@ namespace Catch {
         virtual std::string translate( ExceptionTranslators::const_iterator it, ExceptionTranslators::const_iterator itEnd ) const = 0;
     };
 
-    class IExceptionTranslatorRegistry {
-    public:
-        virtual ~IExceptionTranslatorRegistry(); // = default
-        virtual std::string translateActiveException() const = 0;
-    };
-
 } // namespace Catch
 
 #endif // CATCH_INTERFACES_EXCEPTION_HPP_INCLUDED

src/catch2/interfaces/catch_interfaces_registry_hub.cpp

@@ -1,14 +0,0 @@
-
-//              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
-
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
-
-namespace Catch {
-    IRegistryHub::~IRegistryHub() = default;
-    IMutableRegistryHub::~IMutableRegistryHub() = default;
-}

src/catch2/interfaces/catch_interfaces_registry_hub.hpp

@@ -1,66 +0,0 @@
-
-//              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
-#ifndef CATCH_INTERFACES_REGISTRY_HUB_HPP_INCLUDED
-#define CATCH_INTERFACES_REGISTRY_HUB_HPP_INCLUDED
-
-#include <catch2/internal/catch_unique_ptr.hpp>
-
-#include <string>
-
-namespace Catch {
-
-    class TestCaseHandle;
-    struct TestCaseInfo;
-    class ITestCaseRegistry;
-    class IExceptionTranslatorRegistry;
-    class IExceptionTranslator;
-    class IReporterRegistry;
-    class IReporterFactory;
-    class ITagAliasRegistry;
-    class ITestInvoker;
-    class IMutableEnumValuesRegistry;
-    struct SourceLineInfo;
-
-    class StartupExceptionRegistry;
-    class EventListenerFactory;
-
-    using IReporterFactoryPtr = Detail::unique_ptr<IReporterFactory>;
-
-    class IRegistryHub {
-    public:
-        virtual ~IRegistryHub(); // = default
-
-        virtual IReporterRegistry const& getReporterRegistry() const = 0;
-        virtual ITestCaseRegistry const& getTestCaseRegistry() const = 0;
-        virtual ITagAliasRegistry const& getTagAliasRegistry() const = 0;
-        virtual IExceptionTranslatorRegistry const& getExceptionTranslatorRegistry() const = 0;
-
-
-        virtual StartupExceptionRegistry const& getStartupExceptionRegistry() const = 0;
-    };
-
-    class IMutableRegistryHub {
-    public:
-        virtual ~IMutableRegistryHub(); // = default
-        virtual void registerReporter( std::string const& name, IReporterFactoryPtr factory ) = 0;
-        virtual void registerListener( Detail::unique_ptr<EventListenerFactory> factory ) = 0;
-        virtual void registerTest(Detail::unique_ptr<TestCaseInfo>&& testInfo, Detail::unique_ptr<ITestInvoker>&& invoker) = 0;
-        virtual void registerTranslator( Detail::unique_ptr<IExceptionTranslator>&& translator ) = 0;
-        virtual void registerTagAlias( std::string const& alias, std::string const& tag, SourceLineInfo const& lineInfo ) = 0;
-        virtual void registerStartupException() noexcept = 0;
-        virtual IMutableEnumValuesRegistry& getMutableEnumValuesRegistry() = 0;
-    };
-
-    IRegistryHub const& getRegistryHub();
-    IMutableRegistryHub& getMutableRegistryHub();
-    void cleanUp();
-    std::string translateActiveException();
-
-}
-
-#endif // CATCH_INTERFACES_REGISTRY_HUB_HPP_INCLUDED

src/catch2/interfaces/catch_interfaces_reporter.cpp

@@ -54,8 +54,6 @@ namespace Catch {
         infoMessages( _infoMessages ),
         totals( _totals )
     {
-        assertionResult.m_resultData.lazyExpression.m_transientExpression = _assertionResult.m_resultData.lazyExpression.m_transientExpression;
-
         if( assertionResult.hasMessage() ) {
             // Copy message into messages list.
             // !TBD This should have been done earlier, somewhere

src/catch2/interfaces/catch_interfaces_reporter.hpp

@@ -9,6 +9,7 @@
 #define CATCH_INTERFACES_REPORTER_HPP_INCLUDED
 
 #include <catch2/catch_section_info.hpp>
+#include <catch2/catch_test_run_info.hpp>
 #include <catch2/catch_totals.hpp>
 #include <catch2/catch_assertion_result.hpp>
 #include <catch2/internal/catch_message_info.hpp>
@@ -17,15 +18,18 @@
 #include <catch2/internal/catch_move_and_forward.hpp>
 #include <catch2/benchmark/catch_estimate.hpp>
 #include <catch2/benchmark/catch_outlier_classification.hpp>
-
+#include <catch2/internal/catch_benchmark_stats_fwd.hpp>
 
 #include <map>
 #include <string>
 #include <vector>
 #include <iosfwd>
+#include <chrono>
 
 namespace Catch {
 
+    struct BenchmarkInfo;
+
     struct ReporterDescription;
     struct ListenerDescription;
     struct TagInfo;
@@ -57,11 +61,6 @@ namespace Catch {
         std::map<std::string, std::string> m_customOptions;
     };
 
-    struct TestRunInfo {
-        constexpr TestRunInfo(StringRef _name) : name(_name) {}
-        StringRef name;
-    };
-
     struct AssertionStats {
         AssertionStats( AssertionResult const& _assertionResult,
                         std::vector<MessageInfo> const& _infoMessages,

src/catch2/interfaces/catch_interfaces_reporter_registry.cpp

@@ -1,13 +0,0 @@
-
-//              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
-
-#include <catch2/interfaces/catch_interfaces_reporter_registry.hpp>
-
-namespace Catch {
-    IReporterRegistry::~IReporterRegistry() = default;
-}

src/catch2/interfaces/catch_interfaces_reporter_registry.hpp

@@ -1,42 +0,0 @@
-
-//              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
-#ifndef CATCH_INTERFACES_REPORTER_REGISTRY_HPP_INCLUDED
-#define CATCH_INTERFACES_REPORTER_REGISTRY_HPP_INCLUDED
-
-#include <catch2/internal/catch_case_insensitive_comparisons.hpp>
-#include <catch2/internal/catch_unique_ptr.hpp>
-
-#include <string>
-#include <vector>
-#include <map>
-
-namespace Catch {
-
-    class IConfig;
-
-    class IEventListener;
-    using IEventListenerPtr = Detail::unique_ptr<IEventListener>;
-    class IReporterFactory;
-    using IReporterFactoryPtr = Detail::unique_ptr<IReporterFactory>;
-    struct ReporterConfig;
-    class EventListenerFactory;
-
-    class IReporterRegistry {
-    public:
-        using FactoryMap = std::map<std::string, IReporterFactoryPtr, Detail::CaseInsensitiveLess>;
-        using Listeners = std::vector<Detail::unique_ptr<EventListenerFactory>>;
-
-        virtual ~IReporterRegistry(); // = default
-        virtual IEventListenerPtr create( std::string const& name, ReporterConfig&& config ) const = 0;
-        virtual FactoryMap const& getFactories() const = 0;
-        virtual Listeners const& getListeners() const = 0;
-    };
-
-} // end namespace Catch
-
-#endif // CATCH_INTERFACES_REPORTER_REGISTRY_HPP_INCLUDED

src/catch2/interfaces/catch_interfaces_tag_alias_registry.hpp

@@ -1,29 +0,0 @@
-
-//              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
-#ifndef CATCH_INTERFACES_TAG_ALIAS_REGISTRY_HPP_INCLUDED
-#define CATCH_INTERFACES_TAG_ALIAS_REGISTRY_HPP_INCLUDED
-
-#include <string>
-
-namespace Catch {
-
-    struct TagAlias;
-
-    class ITagAliasRegistry {
-    public:
-        virtual ~ITagAliasRegistry(); // = default
-        // Nullptr if not present
-        virtual TagAlias const* find( std::string const& alias ) const = 0;
-        virtual std::string expandAliases( std::string const& unexpandedTestSpec ) const = 0;
-
-        static ITagAliasRegistry const& get();
-    };
-
-} // end namespace Catch
-
-#endif // CATCH_INTERFACES_TAG_ALIAS_REGISTRY_HPP_INCLUDED

src/catch2/interfaces/catch_interfaces_testcase.cpp

@@ -10,5 +10,4 @@
 
 namespace Catch {
     ITestInvoker::~ITestInvoker() = default;
-    ITestCaseRegistry::~ITestCaseRegistry() = default;
 }

src/catch2/interfaces/catch_interfaces_testcase.hpp

@@ -8,36 +8,14 @@
 #ifndef CATCH_INTERFACES_TESTCASE_HPP_INCLUDED
 #define CATCH_INTERFACES_TESTCASE_HPP_INCLUDED
 
-#include <vector>
-
 namespace Catch {
 
-    class TestSpec;
-    struct TestCaseInfo;
-
     class ITestInvoker {
     public:
         virtual void invoke () const = 0;
         virtual ~ITestInvoker(); // = default
     };
 
-    class TestCaseHandle;
-    class IConfig;
-
-    class ITestCaseRegistry {
-    public:
-        virtual ~ITestCaseRegistry(); // = default
-        // TODO: this exists only for adding filenames to test cases -- let's expose this in a saner way later
-        virtual std::vector<TestCaseInfo* > const& getAllInfos() const = 0;
-        virtual std::vector<TestCaseHandle> const& getAllTests() const = 0;
-        virtual std::vector<TestCaseHandle> const& getAllTestsSorted( IConfig const& config ) const = 0;
-    };
-
-    bool isThrowSafe( TestCaseHandle const& testCase, IConfig const& config );
-    bool matchTest( TestCaseHandle const& testCase, TestSpec const& testSpec, IConfig const& config );
-    std::vector<TestCaseHandle> filterTests( std::vector<TestCaseHandle> const& testCases, TestSpec const& testSpec, IConfig const& config );
-    std::vector<TestCaseHandle> const& getAllTestCasesSorted( IConfig const& config );
-
 }
 
 #endif // CATCH_INTERFACES_TESTCASE_HPP_INCLUDED

src/catch2/internal/catch_assertion_handler.cpp

@@ -11,7 +11,7 @@
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/internal/catch_debugger.hpp>
 #include <catch2/internal/catch_test_failure_exception.hpp>
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 #include <catch2/internal/catch_run_context.hpp>
 #include <catch2/matchers/catch_matchers_string.hpp>
 
@@ -38,7 +38,7 @@ namespace Catch {
     }
 
     void AssertionHandler::complete() {
-        setCompleted();
+        m_completed = true;
         if( m_reaction.shouldDebugBreak ) {
 
             // If you find your debugger stopping you here then go one level up on the
@@ -51,16 +51,9 @@ namespace Catch {
             throw_test_failure_exception();
         }
         if ( m_reaction.shouldSkip ) {
-#if !defined( CATCH_CONFIG_DISABLE_EXCEPTIONS )
-            throw Catch::TestSkipException();
-#else
-            CATCH_ERROR( "Explicitly skipping tests during runtime requires exceptions" );
-#endif
+            throw_test_skip_exception();
         }
     }
-    void AssertionHandler::setCompleted() {
-        m_completed = true;
-    }
 
     void AssertionHandler::handleUnexpectedInflightException() {
         m_resultCapture.handleUnexpectedInflightException( m_assertionInfo, Catch::translateActiveException(), m_reaction );

src/catch2/internal/catch_assertion_handler.hpp

@@ -10,14 +10,14 @@
 
 #include <catch2/catch_assertion_info.hpp>
 #include <catch2/internal/catch_decomposer.hpp>
-#include <catch2/interfaces/catch_interfaces_capture.hpp>
+#include <catch2/internal/catch_run_context.hpp>
 #include <catch2/internal/catch_lazy_expr.hpp>
 
 #include <string>
 
 namespace Catch {
 
-    class IResultCapture;
+    class RunContext;
 
     struct AssertionReaction {
         bool shouldDebugBreak = false;
@@ -29,7 +29,7 @@ namespace Catch {
         AssertionInfo m_assertionInfo;
         AssertionReaction m_reaction;
         bool m_completed = false;
-        IResultCapture& m_resultCapture;
+        RunContext& m_resultCapture;
 
     public:
         AssertionHandler
@@ -59,7 +59,6 @@ namespace Catch {
         void handleUnexpectedInflightException();
 
         void complete();
-        void setCompleted();
 
         // query
         auto allowThrows() const -> bool;

src/catch2/internal/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 <chrono>
+
+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 = std::chrono::duration<double, std::nano>>
+    struct BenchmarkStats;
+
+} // end namespace Catch
+
+#endif // CATCH_BENCHMARK_STATS_FWD_HPP_INCLUDED

src/catch2/internal/catch_commandline.cpp

@@ -9,8 +9,8 @@
 
 #include <catch2/catch_config.hpp>
 #include <catch2/internal/catch_string_manip.hpp>
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
-#include <catch2/interfaces/catch_interfaces_reporter_registry.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
+#include <catch2/internal/catch_reporter_registry.hpp>
 #include <catch2/internal/catch_console_colour.hpp>
 #include <catch2/internal/catch_parse_numbers.hpp>
 #include <catch2/internal/catch_reporter_spec_parser.hpp>
@@ -144,7 +144,7 @@ namespace Catch {
 
             auto const& reporterSpec = *parsed;
 
-            IReporterRegistry::FactoryMap const& factories =
+            auto const& factories =
                 getRegistryHub().getReporterRegistry().getFactories();
             auto result = factories.find( reporterSpec.name() );
 

src/catch2/internal/catch_console_colour.cpp

@@ -85,7 +85,7 @@ namespace Catch {
     namespace {
         //! A do-nothing implementation of colour, used as fallback for unknown
         //! platforms, and when the user asks to deactivate all colours.
-        class NoColourImpl : public ColourImpl {
+        class NoColourImpl final : public ColourImpl {
         public:
             NoColourImpl( IStream* stream ): ColourImpl( stream ) {}
 
@@ -103,7 +103,7 @@ namespace Catch {
 namespace Catch {
 namespace {
 
-    class Win32ColourImpl : public ColourImpl {
+    class Win32ColourImpl final : public ColourImpl {
     public:
         Win32ColourImpl(IStream* stream):
             ColourImpl(stream) {
@@ -169,7 +169,7 @@ namespace {
 namespace Catch {
 namespace {
 
-    class ANSIColourImpl : public ColourImpl {
+    class ANSIColourImpl final : public ColourImpl {
     public:
         ANSIColourImpl( IStream* stream ): ColourImpl( stream ) {}
 

src/catch2/internal/catch_context.cpp

@@ -11,49 +11,27 @@
 
 namespace Catch {
 
-    class Context : public IMutableContext, private Detail::NonCopyable {
+    Context* Context::currentContext = nullptr;
 
-    public: // IContext
-        IResultCapture* getResultCapture() override {
-            return m_resultCapture;
-        }
-
-        IConfig const* getConfig() const override {
-            return m_config;
-        }
-
-        ~Context() override;
-
-    public: // IMutableContext
-        void setResultCapture( IResultCapture* resultCapture ) override {
-            m_resultCapture = resultCapture;
-        }
-        void setConfig( IConfig const* config ) override {
-            m_config = config;
-        }
-
-        friend IMutableContext& getCurrentMutableContext();
-
-    private:
-        IConfig const* m_config = nullptr;
-        IResultCapture* m_resultCapture = nullptr;
-    };
-
-    IMutableContext *IMutableContext::currentContext = nullptr;
-
-    void IMutableContext::createContext()
-    {
+    void cleanUpContext() {
+        delete Context::currentContext;
+        Context::currentContext = nullptr;
+    }
+    void Context::createContext() {
         currentContext = new Context();
     }
 
-    void cleanUpContext() {
-        delete IMutableContext::currentContext;
-        IMutableContext::currentContext = nullptr;
+    Context& getCurrentMutableContext() {
+        if ( !Context::currentContext ) { Context::createContext(); }
+        // NOLINTNEXTLINE(clang-analyzer-core.uninitialized.UndefReturn)
+        return *Context::currentContext;
     }
-    IContext::~IContext() = default;
-    IMutableContext::~IMutableContext() = default;
-    Context::~Context() = default;
 
+    void Context::setResultCapture( RunContext* resultCapture ) {
+        m_resultCapture = resultCapture;
+    }
+
+    void Context::setConfig( IConfig const* config ) { m_config = config; }
 
     SimplePcg32& sharedRng() {
         static SimplePcg32 s_rng;

src/catch2/internal/catch_context.hpp

@@ -12,41 +12,34 @@
 
 namespace Catch {
 
-    class IResultCapture;
+    class RunContext;
     class IConfig;
 
-    class IContext {
-    public:
-        virtual ~IContext(); // = default
+    class Context {
+        IConfig const* m_config = nullptr;
+        RunContext* m_resultCapture = nullptr;
 
-        virtual IResultCapture* getResultCapture() = 0;
-        virtual IConfig const* getConfig() const = 0;
-    };
-
-    class IMutableContext : public IContext {
-    public:
-        ~IMutableContext() override; // = default
-        virtual void setResultCapture( IResultCapture* resultCapture ) = 0;
-        virtual void setConfig( IConfig const* config ) = 0;
-
-    private:
-        CATCH_EXPORT static IMutableContext* currentContext;
-        friend IMutableContext& getCurrentMutableContext();
-        friend void cleanUpContext();
+        CATCH_EXPORT static Context* currentContext;
+        friend Context& getCurrentMutableContext();
+        friend Context const& getCurrentContext();
         static void createContext();
+        friend void cleanUpContext();
+
+    public:
+        RunContext* getResultCapture() const { return m_resultCapture; }
+        IConfig const* getConfig() const { return m_config; }
+        void setResultCapture( RunContext* resultCapture );
+        void setConfig( IConfig const* config );
     };
 
-    inline IMutableContext& getCurrentMutableContext()
-    {
-        if( !IMutableContext::currentContext )
-            IMutableContext::createContext();
-        // NOLINTNEXTLINE(clang-analyzer-core.uninitialized.UndefReturn)
-        return *IMutableContext::currentContext;
-    }
+    Context& getCurrentMutableContext();
 
-    inline IContext& getCurrentContext()
-    {
-        return getCurrentMutableContext();
+    inline Context const& getCurrentContext() {
+        // We duplicate the logic from `getCurrentMutableContext` here,
+        // to avoid paying the call overhead in debug mode.
+        if ( !Context::currentContext ) { Context::createContext(); }
+        // NOLINTNEXTLINE(clang-analyzer-core.uninitialized.UndefReturn)
+        return *Context::currentContext;
     }
 
     void cleanUpContext();

src/catch2/internal/catch_enum_values_registry.cpp

@@ -12,44 +12,47 @@
 
 namespace Catch {
 
-    IMutableEnumValuesRegistry::~IMutableEnumValuesRegistry() = default;
-
     namespace Detail {
 
         namespace {
             // Extracts the actual name part of an enum instance
-            // In other words, it returns the Blue part of Bikeshed::Colour::Blue
-            StringRef extractInstanceName(StringRef enumInstance) {
+            // In other words, it returns the Blue part of
+            // Bikeshed::Colour::Blue
+            static StringRef extractInstanceName( StringRef enumInstance ) {
                 // Find last occurrence of ":"
                 size_t name_start = enumInstance.size();
-                while (name_start > 0 && enumInstance[name_start - 1] != ':') {
+                while ( name_start > 0 &&
+                        enumInstance[name_start - 1] != ':' ) {
                     --name_start;
                 }
-                return enumInstance.substr(name_start, enumInstance.size() - name_start);
+                return enumInstance.substr( name_start,
+                                            enumInstance.size() - name_start );
             }
-        }
+        } // end unnamed namespace
 
         std::vector<StringRef> parseEnums( StringRef enums ) {
             auto enumValues = splitStringRef( enums, ',' );
             std::vector<StringRef> parsed;
             parsed.reserve( enumValues.size() );
-            for( auto const& enumValue : enumValues ) {
-                parsed.push_back(trim(extractInstanceName(enumValue)));
+            for ( auto const& enumValue : enumValues ) {
+                parsed.push_back( trim( extractInstanceName( enumValue ) ) );
             }
             return parsed;
         }
 
-        EnumInfo::~EnumInfo() {}
+        EnumInfo::~EnumInfo() = default;
 
         StringRef EnumInfo::lookup( int value ) const {
-            for( auto const& valueToName : m_values ) {
-                if( valueToName.first == value )
-                    return valueToName.second;
+            for ( auto const& valueToName : m_values ) {
+                if ( valueToName.first == value ) { return valueToName.second; }
             }
             return "{** unexpected enum value **}"_sr;
         }
 
-        Catch::Detail::unique_ptr<EnumInfo> makeEnumInfo( StringRef enumName, StringRef allValueNames, std::vector<int> const& values ) {
+        Catch::Detail::unique_ptr<EnumInfo>
+        makeEnumInfo( StringRef enumName,
+                      StringRef allValueNames,
+                      std::vector<int> const& values ) {
             auto enumInfo = Catch::Detail::make_unique<EnumInfo>();
             enumInfo->m_name = enumName;
             enumInfo->m_values.reserve( values.size() );
@@ -57,17 +60,22 @@ namespace Catch {
             const auto valueNames = Catch::Detail::parseEnums( allValueNames );
             assert( valueNames.size() == values.size() );
             std::size_t i = 0;
-            for( auto value : values )
-                enumInfo->m_values.emplace_back(value, valueNames[i++]);
+            for ( auto value : values ) {
+                enumInfo->m_values.emplace_back( value, valueNames[i++] );
+            }
 
             return enumInfo;
         }
 
-        EnumInfo const& EnumValuesRegistry::registerEnum( StringRef enumName, StringRef allValueNames, std::vector<int> const& values ) {
-            m_enumInfos.push_back(makeEnumInfo(enumName, allValueNames, values));
-            return *m_enumInfos.back();
-        }
+    } // namespace Detail
 
-    } // Detail
-} // Catch
+    Detail::EnumInfo const&
+    EnumValuesRegistry::registerEnum( StringRef enumName,
+                                      StringRef allValueNames,
+                                      std::vector<int> const& values ) {
+        m_enumInfos.push_back(
+            Detail::makeEnumInfo( enumName, allValueNames, values ) );
+        return *m_enumInfos.back();
+    }
 
+} // namespace Catch

src/catch2/internal/catch_enum_values_registry.hpp

@@ -8,29 +8,54 @@
 #ifndef CATCH_ENUM_VALUES_REGISTRY_HPP_INCLUDED
 #define CATCH_ENUM_VALUES_REGISTRY_HPP_INCLUDED
 
-#include <catch2/interfaces/catch_interfaces_enum_values_registry.hpp>
-#include <catch2/internal/catch_unique_ptr.hpp>
 #include <catch2/internal/catch_stringref.hpp>
+#include <catch2/internal/catch_unique_ptr.hpp>
 
 #include <vector>
 
 namespace Catch {
 
     namespace Detail {
+        struct EnumInfo {
+            StringRef m_name;
+            std::vector<std::pair<int, StringRef>> m_values;
 
-        Catch::Detail::unique_ptr<EnumInfo> makeEnumInfo( StringRef enumName, StringRef allValueNames, std::vector<int> const& values );
+            ~EnumInfo();
 
-        class EnumValuesRegistry : public IMutableEnumValuesRegistry {
-
-            std::vector<Catch::Detail::unique_ptr<EnumInfo>> m_enumInfos;
-
-            EnumInfo const& registerEnum( StringRef enumName, StringRef allEnums, std::vector<int> const& values) override;
+            StringRef lookup( int value ) const;
         };
 
+        Detail::unique_ptr<EnumInfo>
+        makeEnumInfo( StringRef enumName,
+                      StringRef allValueNames,
+                      std::vector<int> const& values );
         std::vector<StringRef> parseEnums( StringRef enums );
 
-    } // Detail
+    } // namespace Detail
 
-} // Catch
+    class EnumValuesRegistry {
+        std::vector<Catch::Detail::unique_ptr<Detail::EnumInfo>> m_enumInfos;
+
+    public:
+        Detail::EnumInfo const& registerEnum( StringRef enumName,
+                                              StringRef allEnums,
+                                              std::vector<int> const& values );
+        template <typename E>
+        Detail::EnumInfo const&
+        registerEnum( StringRef enumName,
+                      StringRef allEnums,
+                      std::initializer_list<E> values ) {
+            static_assert( sizeof( int ) >= sizeof( E ),
+                           "Cannot serialize enum to int" );
+            std::vector<int> intValues;
+            intValues.reserve( values.size() );
+            for ( auto enumValue : values ) {
+                intValues.push_back( static_cast<int>( enumValue ) );
+            }
+            return registerEnum( enumName, allEnums, intValues );
+        }
+    };
+
+} // namespace Catch
 
 #endif // CATCH_ENUM_VALUES_REGISTRY_HPP_INCLUDED

src/catch2/internal/catch_exception_translator_registry.cpp

@@ -6,18 +6,41 @@
 
 // SPDX-License-Identifier: BSL-1.0
 #include <catch2/internal/catch_exception_translator_registry.hpp>
+#include <catch2/interfaces/catch_interfaces_exception.hpp>
 #include <catch2/internal/catch_compiler_capabilities.hpp>
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/internal/catch_test_failure_exception.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 
+#include <vector>
+
 namespace Catch {
 
-    ExceptionTranslatorRegistry::~ExceptionTranslatorRegistry() {
+    namespace {
+        static std::string tryTranslators(
+            std::vector<Detail::unique_ptr<IExceptionTranslator const>> const&
+                translators ) {
+            if ( translators.empty() ) {
+                std::rethrow_exception( std::current_exception() );
+            } else {
+                return translators[0]->translate( translators.begin() + 1,
+                                                  translators.end() );
+            }
+        }
     }
 
+
+    struct ExceptionTranslatorRegistry::ExceptionTranslatorRegistryImpl {
+        std::vector<Detail::unique_ptr<IExceptionTranslator const>>
+            translators;
+    };
+
+    ExceptionTranslatorRegistry::ExceptionTranslatorRegistry():
+        m_impl( Detail::make_unique<ExceptionTranslatorRegistryImpl>() ) {}
+    ExceptionTranslatorRegistry::~ExceptionTranslatorRegistry() = default;
+
     void ExceptionTranslatorRegistry::registerTranslator( Detail::unique_ptr<IExceptionTranslator>&& translator ) {
-        m_translators.push_back( CATCH_MOVE( translator ) );
+        m_impl->translators.push_back( CATCH_MOVE( translator ) );
     }
 
 #if !defined(CATCH_CONFIG_DISABLE_EXCEPTIONS)
@@ -37,7 +60,7 @@ namespace Catch {
         // First we try user-registered translators. If none of them can
         // handle the exception, it will be rethrown handled by our defaults.
         try {
-            return tryTranslators();
+            return tryTranslators(m_impl->translators);
         }
         // To avoid having to handle TFE explicitly everywhere, we just
         // rethrow it so that it goes back up the caller.
@@ -61,22 +84,10 @@ namespace Catch {
         }
     }
 
-    std::string ExceptionTranslatorRegistry::tryTranslators() const {
-        if (m_translators.empty()) {
-            std::rethrow_exception(std::current_exception());
-        } else {
-            return m_translators[0]->translate(m_translators.begin() + 1, m_translators.end());
-        }
-    }
-
 #else // ^^ Exceptions are enabled // Exceptions are disabled vv
     std::string ExceptionTranslatorRegistry::translateActiveException() const {
         CATCH_INTERNAL_ERROR("Attempted to translate active exception under CATCH_CONFIG_DISABLE_EXCEPTIONS!");
     }
-
-    std::string ExceptionTranslatorRegistry::tryTranslators() const {
-        CATCH_INTERNAL_ERROR("Attempted to use exception translators under CATCH_CONFIG_DISABLE_EXCEPTIONS!");
-    }
 #endif
 
 

src/catch2/internal/catch_exception_translator_registry.hpp

@@ -8,23 +8,22 @@
 #ifndef CATCH_EXCEPTION_TRANSLATOR_REGISTRY_HPP_INCLUDED
 #define CATCH_EXCEPTION_TRANSLATOR_REGISTRY_HPP_INCLUDED
 
-#include <catch2/interfaces/catch_interfaces_exception.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 
-#include <vector>
 #include <string>
 
 namespace Catch {
+    class IExceptionTranslator;
+
+    class ExceptionTranslatorRegistry {
+        struct ExceptionTranslatorRegistryImpl;
+        Detail::unique_ptr<ExceptionTranslatorRegistryImpl> m_impl;
 
-    class ExceptionTranslatorRegistry : public IExceptionTranslatorRegistry {
     public:
-        ~ExceptionTranslatorRegistry() override;
+        ExceptionTranslatorRegistry();
+        ~ExceptionTranslatorRegistry();
         void registerTranslator( Detail::unique_ptr<IExceptionTranslator>&& translator );
-        std::string translateActiveException() const override;
-        std::string tryTranslators() const;
-
-    private:
-        ExceptionTranslators m_translators;
+        std::string translateActiveException() const;
     };
 }
 

src/catch2/internal/catch_fatal_condition_handler.cpp

@@ -28,7 +28,7 @@
 
 #include <catch2/internal/catch_context.hpp>
 #include <catch2/internal/catch_enforce.hpp>
-#include <catch2/interfaces/catch_interfaces_capture.hpp>
+#include <catch2/internal/catch_run_context.hpp>
 #include <catch2/internal/catch_windows_h_proxy.hpp>
 #include <catch2/internal/catch_stdstreams.hpp>
 

src/catch2/internal/catch_istream.cpp

@@ -24,7 +24,7 @@ namespace Catch {
 namespace Detail {
     namespace {
         template<typename WriterF, std::size_t bufferSize=256>
-        class StreamBufImpl : public std::streambuf {
+        class StreamBufImpl final : public std::streambuf {
             char data[bufferSize];
             WriterF m_writer;
 
@@ -72,7 +72,7 @@ namespace Detail {
 
         ///////////////////////////////////////////////////////////////////////////
 
-        class FileStream : public IStream {
+        class FileStream final : public IStream {
             std::ofstream m_ofs;
         public:
             FileStream( std::string const& filename ) {
@@ -89,7 +89,7 @@ namespace Detail {
 
         ///////////////////////////////////////////////////////////////////////////
 
-        class CoutStream : public IStream {
+        class CoutStream final : public IStream {
             std::ostream m_os;
         public:
             // Store the streambuf from cout up-front because
@@ -118,7 +118,7 @@ namespace Detail {
 
         ///////////////////////////////////////////////////////////////////////////
 
-        class DebugOutStream : public IStream {
+        class DebugOutStream final : public IStream {
             Detail::unique_ptr<StreamBufImpl<OutputDebugWriter>> m_streamBuf;
             std::ostream m_os;
         public:

src/catch2/internal/catch_leak_detector.cpp

@@ -7,7 +7,7 @@
 // SPDX-License-Identifier: BSL-1.0
 
 #include <catch2/internal/catch_leak_detector.hpp>
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 #include <catch2/catch_user_config.hpp>
 
 #ifdef CATCH_CONFIG_WINDOWS_CRTDBG

src/catch2/internal/catch_list.cpp

@@ -7,14 +7,14 @@
 // SPDX-License-Identifier: BSL-1.0
 #include <catch2/internal/catch_list.hpp>
 
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 #include <catch2/interfaces/catch_interfaces_reporter.hpp>
-#include <catch2/interfaces/catch_interfaces_reporter_registry.hpp>
 #include <catch2/interfaces/catch_interfaces_testcase.hpp>
 #include <catch2/interfaces/catch_interfaces_reporter_factory.hpp>
+#include <catch2/internal/catch_reporter_registry.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 #include <catch2/internal/catch_case_insensitive_comparisons.hpp>
-
+#include <catch2/internal/catch_test_case_registry_impl.hpp>
 #include <catch2/internal/catch_context.hpp>
 #include <catch2/catch_config.hpp>
 #include <catch2/catch_test_spec.hpp>
@@ -54,7 +54,7 @@ namespace Catch {
         void listReporters(IEventListener& reporter) {
             std::vector<ReporterDescription> descriptions;
 
-            IReporterRegistry::FactoryMap const& factories = getRegistryHub().getReporterRegistry().getFactories();
+            auto const& factories = getRegistryHub().getReporterRegistry().getFactories();
             descriptions.reserve(factories.size());
             for (auto const& fac : factories) {
                 descriptions.push_back({ fac.first, fac.second->getDescription() });

src/catch2/internal/catch_message_info.hpp

@@ -10,7 +10,7 @@
 
 #include <catch2/internal/catch_result_type.hpp>
 #include <catch2/internal/catch_source_line_info.hpp>
-#include <catch2/interfaces/catch_interfaces_capture.hpp>
+#include <catch2/internal/catch_stringref.hpp>
 
 #include <string>
 

src/catch2/internal/catch_registry_hub.cpp

@@ -0,0 +1,114 @@
+
+//              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/internal/catch_registry_hub.hpp>
+
+#include <catch2/internal/catch_context.hpp>
+#include <catch2/internal/catch_enforce.hpp>
+#include <catch2/internal/catch_test_case_registry_impl.hpp>
+#include <catch2/internal/catch_reporter_registry.hpp>
+#include <catch2/internal/catch_exception_translator_registry.hpp>
+#include <catch2/internal/catch_tag_alias_registry.hpp>
+#include <catch2/internal/catch_startup_exception_registry.hpp>
+#include <catch2/internal/catch_singletons.hpp>
+#include <catch2/internal/catch_enum_values_registry.hpp>
+#include <catch2/catch_test_case_info.hpp>
+#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>
+
+namespace Catch {
+
+    struct RegistryHub::RegistryHubImpl {
+        TestCaseRegistry testCaseRegistry;
+        ReporterRegistry reporterRegistry;
+        ExceptionTranslatorRegistry exceptionTranslatorRegistry;
+        TagAliasRegistry tagAliasRegistry;
+        StartupExceptionRegistry exceptionRegistry;
+        EnumValuesRegistry enumValuesRegistry;
+    };
+
+    RegistryHub::RegistryHub():
+        m_impl( Detail::make_unique<RegistryHubImpl>() ) {}
+    RegistryHub::~RegistryHub() = default;
+
+    ReporterRegistry const&
+    RegistryHub::getReporterRegistry() const {
+        return m_impl->reporterRegistry;
+    }
+    TestCaseRegistry const&
+    RegistryHub::getTestCaseRegistry() const {
+        return m_impl->testCaseRegistry;
+    }
+    ExceptionTranslatorRegistry const&
+    RegistryHub::getExceptionTranslatorRegistry() const {
+        return m_impl->exceptionTranslatorRegistry;
+    }
+    TagAliasRegistry const&
+    RegistryHub::getTagAliasRegistry() const {
+        return m_impl->tagAliasRegistry;
+    }
+    StartupExceptionRegistry const&
+    RegistryHub::getStartupExceptionRegistry() const {
+        return m_impl->exceptionRegistry;
+    }
+    void
+    RegistryHub::registerReporter( std::string const& name,
+                           IReporterFactoryPtr factory ) {
+        m_impl->reporterRegistry.registerReporter( name, CATCH_MOVE( factory ) );
+    }
+    void RegistryHub::registerListener(
+        Detail::unique_ptr<EventListenerFactory> factory ) {
+        m_impl->reporterRegistry.registerListener( CATCH_MOVE( factory ) );
+    }
+    void RegistryHub::registerTest(
+        Detail::unique_ptr<TestCaseInfo>&& testInfo,
+                       Detail::unique_ptr<ITestInvoker>&& invoker ) {
+        m_impl->testCaseRegistry.registerTest( CATCH_MOVE( testInfo ),
+                                         CATCH_MOVE( invoker ) );
+    }
+    void RegistryHub::registerTranslator(
+        Detail::unique_ptr<IExceptionTranslator>&& translator ) {
+        m_impl->exceptionTranslatorRegistry.registerTranslator(
+            CATCH_MOVE( translator ) );
+    }
+    void RegistryHub::registerTagAlias( std::string const& alias,
+                           std::string const& tag,
+                           SourceLineInfo const& lineInfo ) {
+        m_impl->tagAliasRegistry.add( alias, tag, lineInfo );
+    }
+    void RegistryHub::registerStartupException() noexcept {
+#if !defined( CATCH_CONFIG_DISABLE_EXCEPTIONS )
+        m_impl->exceptionRegistry.add( std::current_exception() );
+#else
+        CATCH_INTERNAL_ERROR( "Attempted to register active exception under "
+                              "CATCH_CONFIG_DISABLE_EXCEPTIONS!" );
+#endif
+    }
+    EnumValuesRegistry& RegistryHub::getMutableEnumValuesRegistry() {
+        return m_impl->enumValuesRegistry;
+    }
+
+    using RegistryHubSingleton = Singleton<RegistryHub>;
+
+    RegistryHub const& getRegistryHub() {
+        return RegistryHubSingleton::get();
+    }
+    RegistryHub& getMutableRegistryHub() {
+        return RegistryHubSingleton::getMutable();
+    }
+    void cleanUp() {
+        cleanupSingletons();
+        cleanUpContext();
+    }
+    std::string translateActiveException() {
+        return getRegistryHub().getExceptionTranslatorRegistry().translateActiveException();
+    }
+
+
+} // end namespace Catch

src/catch2/internal/catch_registry_hub.hpp

@@ -0,0 +1,67 @@
+
+//              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_REGISTRY_HUB_HPP_INCLUDED
+#define CATCH_REGISTRY_HUB_HPP_INCLUDED
+
+#include <catch2/internal/catch_unique_ptr.hpp>
+
+#include <string>
+
+namespace Catch {
+
+    class TestCaseHandle;
+    struct TestCaseInfo;
+    class TestCaseRegistry;
+    class ExceptionTranslatorRegistry;
+    class IExceptionTranslator;
+    class ReporterRegistry;
+    class IReporterFactory;
+    class TagAliasRegistry;
+    class ITestInvoker;
+    class EnumValuesRegistry;
+    struct SourceLineInfo;
+
+    class StartupExceptionRegistry;
+    class EventListenerFactory;
+
+    using IReporterFactoryPtr = Detail::unique_ptr<IReporterFactory>;
+
+    class RegistryHub {
+        struct RegistryHubImpl;
+        Detail::unique_ptr<RegistryHubImpl> m_impl;
+    public:
+        RegistryHub();
+        ~RegistryHub();
+
+        ReporterRegistry const& getReporterRegistry() const;
+        TestCaseRegistry const& getTestCaseRegistry() const;
+        TagAliasRegistry const& getTagAliasRegistry() const;
+        ExceptionTranslatorRegistry const& getExceptionTranslatorRegistry() const;
+        StartupExceptionRegistry const& getStartupExceptionRegistry() const;
+
+        void registerReporter( std::string const& name,
+                               IReporterFactoryPtr factory );
+        void registerListener( Detail::unique_ptr<EventListenerFactory> factory );
+        void registerTest( Detail::unique_ptr<TestCaseInfo>&& testInfo,
+                           Detail::unique_ptr<ITestInvoker>&& invoker );
+        void registerTranslator( Detail::unique_ptr<IExceptionTranslator>&& translator );
+        void registerTagAlias( std::string const& alias,
+                               std::string const& tag,
+                               SourceLineInfo const& lineInfo );
+        void registerStartupException() noexcept;
+        EnumValuesRegistry& getMutableEnumValuesRegistry();
+    };
+
+    RegistryHub const& getRegistryHub();
+    RegistryHub& getMutableRegistryHub();
+    void cleanUp();
+    std::string translateActiveException();
+
+}
+
+#endif // CATCH_REGISTRY_HUB_HPP_INCLUDED

src/catch2/internal/catch_reporter_registry.cpp

@@ -5,61 +5,86 @@
 //        https://www.boost.org/LICENSE_1_0.txt)
 
 // SPDX-License-Identifier: BSL-1.0
-#include <catch2/internal/catch_reporter_registry.hpp>
 
-#include <catch2/reporters/catch_reporter_registrars.hpp>
+#include <catch2/internal/catch_reporter_registry.hpp>
+#include <catch2/interfaces/catch_interfaces_reporter_factory.hpp>
+#include <catch2/internal/catch_enforce.hpp>
+#include <catch2/internal/catch_move_and_forward.hpp>
 #include <catch2/reporters/catch_reporter_automake.hpp>
 #include <catch2/reporters/catch_reporter_compact.hpp>
 #include <catch2/reporters/catch_reporter_console.hpp>
 #include <catch2/reporters/catch_reporter_junit.hpp>
+#include <catch2/reporters/catch_reporter_registrars.hpp>
 #include <catch2/reporters/catch_reporter_sonarqube.hpp>
 #include <catch2/reporters/catch_reporter_tap.hpp>
 #include <catch2/reporters/catch_reporter_teamcity.hpp>
 #include <catch2/reporters/catch_reporter_xml.hpp>
-#include <catch2/internal/catch_move_and_forward.hpp>
-#include <catch2/internal/catch_enforce.hpp>
 
 namespace Catch {
+    struct ReporterRegistry::ReporterRegistryImpl {
+        std::vector<Detail::unique_ptr<EventListenerFactory>> listeners;
+        std::map<std::string, IReporterFactoryPtr, Detail::CaseInsensitiveLess>
+            factories;
+    };
 
-    ReporterRegistry::ReporterRegistry() {
+    ReporterRegistry::ReporterRegistry():
+        m_impl( Detail::make_unique<ReporterRegistryImpl>() ) {
         // Because it is impossible to move out of initializer list,
         // we have to add the elements manually
-        m_factories["Automake"] = Detail::make_unique<ReporterFactory<AutomakeReporter>>();
-        m_factories["compact"] = Detail::make_unique<ReporterFactory<CompactReporter>>();
-        m_factories["console"] = Detail::make_unique<ReporterFactory<ConsoleReporter>>();
-        m_factories["JUnit"] = Detail::make_unique<ReporterFactory<JunitReporter>>();
-        m_factories["SonarQube"] = Detail::make_unique<ReporterFactory<SonarQubeReporter>>();
-        m_factories["TAP"] = Detail::make_unique<ReporterFactory<TAPReporter>>();
-        m_factories["TeamCity"] = Detail::make_unique<ReporterFactory<TeamCityReporter>>();
-        m_factories["XML"] = Detail::make_unique<ReporterFactory<XmlReporter>>();
+        m_impl->factories["Automake"] =
+            Detail::make_unique<ReporterFactory<AutomakeReporter>>();
+        m_impl->factories["compact"] =
+            Detail::make_unique<ReporterFactory<CompactReporter>>();
+        m_impl->factories["console"] =
+            Detail::make_unique<ReporterFactory<ConsoleReporter>>();
+        m_impl->factories["JUnit"] =
+            Detail::make_unique<ReporterFactory<JunitReporter>>();
+        m_impl->factories["SonarQube"] =
+            Detail::make_unique<ReporterFactory<SonarQubeReporter>>();
+        m_impl->factories["TAP"] =
+            Detail::make_unique<ReporterFactory<TAPReporter>>();
+        m_impl->factories["TeamCity"] =
+            Detail::make_unique<ReporterFactory<TeamCityReporter>>();
+        m_impl->factories["XML"] =
+            Detail::make_unique<ReporterFactory<XmlReporter>>();
     }
 
     ReporterRegistry::~ReporterRegistry() = default;
 
+    IEventListenerPtr
+    ReporterRegistry::create( std::string const& name,
+                              ReporterConfig&& config ) const {
+        auto it = m_impl->factories.find( name );
+        if ( it == m_impl->factories.end() ) return nullptr;
+        return it->second->create( CATCH_MOVE( config ) );
 
-    IEventListenerPtr ReporterRegistry::create( std::string const& name, ReporterConfig&& config ) const {
-        auto it =  m_factories.find( name );
-        if( it == m_factories.end() )
-            return nullptr;
-        return it->second->create( CATCH_MOVE(config) );
+        return IEventListenerPtr();
     }
 
-    void ReporterRegistry::registerReporter( std::string const& name, IReporterFactoryPtr factory ) {
+    void ReporterRegistry::registerReporter( std::string const& name,
+                                             IReporterFactoryPtr factory ) {
         CATCH_ENFORCE( name.find( "::" ) == name.npos,
-                       "'::' is not allowed in reporter name: '" + name + '\'' );
-        auto ret = m_factories.emplace(name, CATCH_MOVE(factory));
-        CATCH_ENFORCE( ret.second, "reporter using '" + name + "' as name was already registered" );
+                       "'::' is not allowed in reporter name: '" + name +
+                           '\'' );
+        auto ret = m_impl->factories.emplace( name, CATCH_MOVE( factory ) );
+        CATCH_ENFORCE( ret.second,
+                       "reporter using '" + name +
+                           "' as name was already registered" );
     }
     void ReporterRegistry::registerListener(
         Detail::unique_ptr<EventListenerFactory> factory ) {
-        m_listeners.push_back( CATCH_MOVE(factory) );
+        m_impl->listeners.push_back( CATCH_MOVE( factory ) );
     }
 
-    IReporterRegistry::FactoryMap const& ReporterRegistry::getFactories() const {
-        return m_factories;
-    }
-    IReporterRegistry::Listeners const& ReporterRegistry::getListeners() const {
-        return m_listeners;
+    std::map<std::string,
+             IReporterFactoryPtr,
+             Detail::CaseInsensitiveLess> const&
+    ReporterRegistry::getFactories() const {
+        return m_impl->factories;
     }
 
-}
+    std::vector<Detail::unique_ptr<EventListenerFactory>> const&
+    ReporterRegistry::getListeners() const {
+        return m_impl->listeners;
+    }
+} // namespace Catch

src/catch2/internal/catch_reporter_registry.hpp

@@ -8,31 +8,48 @@
 #ifndef CATCH_REPORTER_REGISTRY_HPP_INCLUDED
 #define CATCH_REPORTER_REGISTRY_HPP_INCLUDED
 
-#include <catch2/interfaces/catch_interfaces_reporter.hpp>
-#include <catch2/interfaces/catch_interfaces_reporter_registry.hpp>
+#include <catch2/internal/catch_case_insensitive_comparisons.hpp>
+#include <catch2/internal/catch_unique_ptr.hpp>
 
 #include <map>
+#include <string>
+#include <vector>
 
 namespace Catch {
 
-    class ReporterRegistry : public IReporterRegistry {
+    class IEventListener;
+    using IEventListenerPtr = Detail::unique_ptr<IEventListener>;
+    class IReporterFactory;
+    using IReporterFactoryPtr = Detail::unique_ptr<IReporterFactory>;
+    struct ReporterConfig;
+    class EventListenerFactory;
+
+    class ReporterRegistry {
+        struct ReporterRegistryImpl;
+        Detail::unique_ptr<ReporterRegistryImpl> m_impl;
+
     public:
-
         ReporterRegistry();
-        ~ReporterRegistry() override; // = default, out of line to allow fwd decl
+        ~ReporterRegistry(); // = default;
 
-        IEventListenerPtr create( std::string const& name, ReporterConfig&& config ) const override;
+        IEventListenerPtr create( std::string const& name,
+                                  ReporterConfig&& config ) const;
 
-        void registerReporter( std::string const& name, IReporterFactoryPtr factory );
-        void registerListener( Detail::unique_ptr<EventListenerFactory> factory );
+        void registerReporter( std::string const& name,
+                               IReporterFactoryPtr factory );
 
-        FactoryMap const& getFactories() const override;
-        Listeners const& getListeners() const override;
+        void
+        registerListener( Detail::unique_ptr<EventListenerFactory> factory );
 
-    private:
-        FactoryMap m_factories;
-        Listeners m_listeners;
+        std::map<std::string,
+                 IReporterFactoryPtr,
+                 Detail::CaseInsensitiveLess> const&
+        getFactories() const;
+
+        std::vector<Detail::unique_ptr<EventListenerFactory>> const&
+        getListeners() const;
     };
-}
+
+} // end namespace Catch
 
 #endif // CATCH_REPORTER_REGISTRY_HPP_INCLUDED

src/catch2/internal/catch_run_context.cpp

@@ -7,7 +7,11 @@
 // SPDX-License-Identifier: BSL-1.0
 #include <catch2/internal/catch_run_context.hpp>
 
+#include <catch2/interfaces/catch_interfaces_reporter.hpp>
+#include <catch2/catch_test_case_info.hpp>
+#include <catch2/catch_assertion_result.hpp>
 #include <catch2/catch_user_config.hpp>
+#include <catch2/catch_timer.hpp>
 #include <catch2/interfaces/catch_interfaces_generatortracker.hpp>
 #include <catch2/interfaces/catch_interfaces_config.hpp>
 #include <catch2/internal/catch_compiler_capabilities.hpp>
@@ -15,10 +19,14 @@
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/internal/catch_fatal_condition_handler.hpp>
 #include <catch2/internal/catch_random_number_generator.hpp>
-#include <catch2/catch_timer.hpp>
 #include <catch2/internal/catch_output_redirect.hpp>
 #include <catch2/internal/catch_assertion_handler.hpp>
 #include <catch2/internal/catch_test_failure_exception.hpp>
+#include <catch2/internal/catch_optional.hpp>
+#include <catch2/internal/catch_move_and_forward.hpp>
+#include <catch2/internal/catch_fatal_condition_handler.hpp>
+#include <catch2/internal/catch_test_case_tracker.hpp>
+#include <catch2/catch_message.hpp>
 
 #include <cassert>
 #include <algorithm>
@@ -26,162 +34,182 @@
 namespace Catch {
 
     namespace Generators {
-        struct GeneratorTracker : TestCaseTracking::TrackerBase, IGeneratorTracker {
-            GeneratorBasePtr m_generator;
+        namespace {
+            struct GeneratorTracker final : TestCaseTracking::TrackerBase,
+                                      IGeneratorTracker {
+                GeneratorBasePtr m_generator;
 
-            GeneratorTracker( TestCaseTracking::NameAndLocation&& nameAndLocation, TrackerContext& ctx, ITracker* parent )
-            :   TrackerBase( CATCH_MOVE(nameAndLocation), ctx, parent )
-            {}
-            ~GeneratorTracker() override;
+                GeneratorTracker(
+                    TestCaseTracking::NameAndLocation&& nameAndLocation,
+                    TrackerContext& ctx,
+                    ITracker* parent ):
+                    TrackerBase( CATCH_MOVE( nameAndLocation ), ctx, parent ) {}
+                ~GeneratorTracker() override = default;
 
-            static GeneratorTracker* acquire( TrackerContext& ctx, TestCaseTracking::NameAndLocationRef const& nameAndLocation ) {
-                GeneratorTracker* tracker;
+                static GeneratorTracker*
+                acquire( TrackerContext& ctx,
+                         TestCaseTracking::NameAndLocationRef const&
+                             nameAndLocation ) {
+                    GeneratorTracker* tracker;
 
-                ITracker& currentTracker = ctx.currentTracker();
-                // Under specific circumstances, the generator we want
-                // to acquire is also the current tracker. If this is
-                // the case, we have to avoid looking through current
-                // tracker's children, and instead return the current
-                // tracker.
-                // A case where this check is important is e.g.
-                //     for (int i = 0; i < 5; ++i) {
-                //         int n = GENERATE(1, 2);
-                //     }
-                //
-                // without it, the code above creates 5 nested generators.
-                if ( currentTracker.nameAndLocation() == nameAndLocation ) {
-                    auto thisTracker =
-                        currentTracker.parent()->findChild( nameAndLocation );
-                    assert( thisTracker );
-                    assert( thisTracker->isGeneratorTracker() );
-                    tracker = static_cast<GeneratorTracker*>( thisTracker );
-                } else if ( ITracker* childTracker =
-                                currentTracker.findChild( nameAndLocation ) ) {
-                    assert( childTracker );
-                    assert( childTracker->isGeneratorTracker() );
-                    tracker = static_cast<GeneratorTracker*>( childTracker );
-                } else {
-                    return nullptr;
+                    ITracker& currentTracker = ctx.currentTracker();
+                    // Under specific circumstances, the generator we want
+                    // to acquire is also the current tracker. If this is
+                    // the case, we have to avoid looking through current
+                    // tracker's children, and instead return the current
+                    // tracker.
+                    // A case where this check is important is e.g.
+                    //     for (int i = 0; i < 5; ++i) {
+                    //         int n = GENERATE(1, 2);
+                    //     }
+                    //
+                    // without it, the code above creates 5 nested generators.
+                    if ( currentTracker.nameAndLocation() == nameAndLocation ) {
+                        auto thisTracker = currentTracker.parent()->findChild(
+                            nameAndLocation );
+                        assert( thisTracker );
+                        assert( thisTracker->isGeneratorTracker() );
+                        tracker = static_cast<GeneratorTracker*>( thisTracker );
+                    } else if ( ITracker* childTracker =
+                                    currentTracker.findChild(
+                                        nameAndLocation ) ) {
+                        assert( childTracker );
+                        assert( childTracker->isGeneratorTracker() );
+                        tracker =
+                            static_cast<GeneratorTracker*>( childTracker );
+                    } else {
+                        return nullptr;
+                    }
+
+                    if ( !tracker->isComplete() ) { tracker->open(); }
+
+                    return tracker;
                 }
 
-                if( !tracker->isComplete() ) {
-                    tracker->open();
+                // TrackerBase interface
+                bool isGeneratorTracker() const override { return true; }
+                auto hasGenerator() const -> bool override {
+                    return !!m_generator;
                 }
-
-                return tracker;
-            }
-
-            // TrackerBase interface
-            bool isGeneratorTracker() const override { return true; }
-            auto hasGenerator() const -> bool override {
-                return !!m_generator;
-            }
-            void close() override {
-                TrackerBase::close();
-                // If a generator has a child (it is followed by a section)
-                // and none of its children have started, then we must wait
-                // until later to start consuming its values.
-                // This catches cases where `GENERATE` is placed between two
-                // `SECTION`s.
-                // **The check for m_children.empty cannot be removed**.
-                // doing so would break `GENERATE` _not_ followed by `SECTION`s.
-                const bool should_wait_for_child = [&]() {
-                    // No children -> nobody to wait for
-                    if ( m_children.empty() ) {
-                        return false;
-                    }
-                    // If at least one child started executing, don't wait
-                    if ( std::find_if(
-                             m_children.begin(),
-                             m_children.end(),
-                             []( TestCaseTracking::ITrackerPtr const& tracker ) {
-                                 return tracker->hasStarted();
-                             } ) != m_children.end() ) {
-                        return false;
-                    }
-
-                    // No children have started. We need to check if they _can_
-                    // start, and thus we should wait for them, or they cannot
-                    // start (due to filters), and we shouldn't wait for them
-                    ITracker* parent = m_parent;
-                    // This is safe: there is always at least one section
-                    // tracker in a test case tracking tree
-                    while ( !parent->isSectionTracker() ) {
-                        parent = parent->parent();
-                    }
-                    assert( parent &&
-                            "Missing root (test case) level section" );
-
-                    auto const& parentSection =
-                        static_cast<SectionTracker const&>( *parent );
-                    auto const& filters = parentSection.getFilters();
-                    // No filters -> no restrictions on running sections
-                    if ( filters.empty() ) {
-                        return true;
-                    }
-
-                    for ( auto const& child : m_children ) {
-                        if ( child->isSectionTracker() &&
-                             std::find(
-                                 filters.begin(),
-                                 filters.end(),
-                                 static_cast<SectionTracker const&>( *child )
-                                     .trimmedName() ) != filters.end() ) {
-                            return true;
+                void close() override {
+                    TrackerBase::close();
+                    // If a generator has a child (it is followed by a section)
+                    // and none of its children have started, then we must wait
+                    // until later to start consuming its values.
+                    // This catches cases where `GENERATE` is placed between two
+                    // `SECTION`s.
+                    // **The check for m_children.empty cannot be removed**.
+                    // doing so would break `GENERATE` _not_ followed by
+                    // `SECTION`s.
+                    const bool should_wait_for_child = [&]() {
+                        // No children -> nobody to wait for
+                        if ( m_children.empty() ) { return false; }
+                        // If at least one child started executing, don't wait
+                        if ( std::find_if(
+                                 m_children.begin(),
+                                 m_children.end(),
+                                 []( TestCaseTracking::ITrackerPtr const&
+                                         tracker ) {
+                                     return tracker->hasStarted();
+                                 } ) != m_children.end() ) {
+                            return false;
                         }
+
+                        // No children have started. We need to check if they
+                        // _can_ start, and thus we should wait for them, or
+                        // they cannot start (due to filters), and we shouldn't
+                        // wait for them
+                        ITracker* parent = m_parent;
+                        // This is safe: there is always at least one section
+                        // tracker in a test case tracking tree
+                        while ( !parent->isSectionTracker() ) {
+                            parent = parent->parent();
+                        }
+                        assert( parent &&
+                                "Missing root (test case) level section" );
+
+                        auto const& parentSection =
+                            static_cast<SectionTracker const&>( *parent );
+                        auto const& filters = parentSection.getFilters();
+                        // No filters -> no restrictions on running sections
+                        if ( filters.empty() ) { return true; }
+
+                        for ( auto const& child : m_children ) {
+                            if ( child->isSectionTracker() &&
+                                 std::find( filters.begin(),
+                                            filters.end(),
+                                            static_cast<SectionTracker const&>(
+                                                *child )
+                                                .trimmedName() ) !=
+                                     filters.end() ) {
+                                return true;
+                            }
+                        }
+                        return false;
+                    }();
+
+                    // This check is a bit tricky, because m_generator->next()
+                    // has a side-effect, where it consumes generator's current
+                    // value, but we do not want to invoke the side-effect if
+                    // this generator is still waiting for any child to start.
+                    assert( m_generator && "Tracker without generator" );
+                    if ( should_wait_for_child ||
+                         ( m_runState == CompletedSuccessfully &&
+                           m_generator->countedNext() ) ) {
+                        m_children.clear();
+                        m_runState = Executing;
                     }
-                    return false;
-                }();
-
-                // This check is a bit tricky, because m_generator->next()
-                // has a side-effect, where it consumes generator's current
-                // value, but we do not want to invoke the side-effect if
-                // this generator is still waiting for any child to start.
-                assert( m_generator && "Tracker without generator" );
-                if ( should_wait_for_child ||
-                     ( m_runState == CompletedSuccessfully &&
-                       m_generator->countedNext() ) ) {
-                    m_children.clear();
-                    m_runState = Executing;
                 }
-            }
 
-            // IGeneratorTracker interface
-            auto getGenerator() const -> GeneratorBasePtr const& override {
-                return m_generator;
-            }
-            void setGenerator( GeneratorBasePtr&& generator ) override {
-                m_generator = CATCH_MOVE( generator );
-            }
-        };
-        GeneratorTracker::~GeneratorTracker() = default;
+                // IGeneratorTracker interface
+                auto getGenerator() const -> GeneratorBasePtr const& override {
+                    return m_generator;
+                }
+                void setGenerator( GeneratorBasePtr&& generator ) override {
+                    m_generator = CATCH_MOVE( generator );
+                }
+            };
+        } // namespace
     }
 
-    RunContext::RunContext(IConfig const* _config, IEventListenerPtr&& reporter)
-    :   m_runInfo(_config->name()),
-        m_context(getCurrentMutableContext()),
+
+    struct RunContext::RunContextImpl {
+        Optional<AssertionResult> lastResult;
+        FatalConditionHandler fatalConditionhandler;
+        TrackerContext trackerContext;
+        std::vector<MessageInfo> messages;
+        // Fake owners for unscoped messages
+        std::vector<ScopedMessage> messageScopes;
+        IEventListenerPtr reporter;
+        std::vector<SectionEndInfo> unfinishedSections;
+        std::vector<ITracker*> activeSections;
+    };
+
+    RunContext::RunContext(IConfig const* _config, IEventListenerPtr&& reporter):
+        m_impl( Detail::make_unique<RunContextImpl>() ),
+        m_runInfo(_config->name()),
         m_config(_config),
-        m_reporter(CATCH_MOVE(reporter)),
         m_lastAssertionInfo{ StringRef(), SourceLineInfo("",0), StringRef(), ResultDisposition::Normal },
-        m_includeSuccessfulResults( m_config->includeSuccessfulResults() || m_reporter->getPreferences().shouldReportAllAssertions )
+        m_includeSuccessfulResults( m_config->includeSuccessfulResults() || reporter->getPreferences().shouldReportAllAssertions )
     {
-        m_context.setResultCapture(this);
-        m_reporter->testRunStarting(m_runInfo);
+        getCurrentMutableContext().setResultCapture(this);
+        m_impl->reporter = CATCH_MOVE( reporter );
+        m_impl->reporter->testRunStarting(m_runInfo);
     }
 
     RunContext::~RunContext() {
-        m_reporter->testRunEnded(TestRunStats(m_runInfo, m_totals, aborting()));
+        m_impl->reporter->testRunEnded(TestRunStats(m_runInfo, m_totals, aborting()));
     }
 
     Totals RunContext::runTest(TestCaseHandle const& testCase) {
         const Totals prevTotals = m_totals;
 
         auto const& testInfo = testCase.getTestCaseInfo();
-        m_reporter->testCaseStarting(testInfo);
+        m_impl->reporter->testCaseStarting( testInfo );
         m_activeTestCase = &testCase;
 
 
-        ITracker& rootTracker = m_trackerContext.startRun();
+        ITracker& rootTracker = m_impl->trackerContext.startRun();
         assert(rootTracker.isSectionTracker());
         static_cast<SectionTracker&>(rootTracker).addInitialFilters(m_config->getSectionsToRun());
 
@@ -222,10 +250,10 @@ namespace Catch {
         std::string redirectedCout;
         std::string redirectedCerr;
         do {
-            m_trackerContext.startCycle();
-            m_testCaseTracker = &SectionTracker::acquire(m_trackerContext, TestCaseTracking::NameAndLocationRef(testInfo.name, testInfo.lineInfo));
+            m_impl->trackerContext.startCycle();
+            m_testCaseTracker = &SectionTracker::acquire(m_impl->trackerContext, TestCaseTracking::NameAndLocationRef(testInfo.name, testInfo.lineInfo));
 
-            m_reporter->testCasePartialStarting(testInfo, testRuns);
+            m_impl->reporter->testCasePartialStarting( testInfo, testRuns );
 
             const auto beforeRunTotals = m_totals;
             std::string oneRunCout, oneRunCerr;
@@ -236,7 +264,7 @@ namespace Catch {
             const auto singleRunTotals = m_totals.delta(beforeRunTotals);
             auto statsForOneRun = TestCaseStats(testInfo, singleRunTotals, CATCH_MOVE(oneRunCout), CATCH_MOVE(oneRunCerr), aborting());
 
-            m_reporter->testCasePartialEnded(statsForOneRun, testRuns);
+            m_impl->reporter->testCasePartialEnded( statsForOneRun, testRuns );
             ++testRuns;
         } while (!m_testCaseTracker->isSuccessfullyCompleted() && !aborting());
 
@@ -247,11 +275,12 @@ namespace Catch {
             deltaTotals.testCases.failed++;
         }
         m_totals.testCases += deltaTotals.testCases;
-        m_reporter->testCaseEnded(TestCaseStats(testInfo,
-                                  deltaTotals,
-                                  CATCH_MOVE(redirectedCout),
-                                  CATCH_MOVE(redirectedCerr),
-                                  aborting()));
+        m_impl->reporter->testCaseEnded(
+            TestCaseStats( testInfo,
+                           deltaTotals,
+                           CATCH_MOVE( redirectedCout ),
+                           CATCH_MOVE( redirectedCerr ),
+                           aborting() ) );
 
         m_activeTestCase = nullptr;
         m_testCaseTracker = nullptr;
@@ -280,14 +309,15 @@ namespace Catch {
             m_lastAssertionPassed = true;
         }
 
-        m_reporter->assertionEnded(AssertionStats(result, m_messages, m_totals));
+        m_impl->reporter->assertionEnded(AssertionStats(result, m_impl->messages, m_totals));
 
-        if (result.getResultType() != ResultWas::Warning)
-            m_messageScopes.clear();
+        if ( result.getResultType() != ResultWas::Warning ) {
+            m_impl->messageScopes.clear();
+        }
 
         // Reset working state
         resetAssertionInfo();
-        m_lastResult = result;
+        m_impl->lastResult = result;
     }
     void RunContext::resetAssertionInfo() {
         m_lastAssertionInfo.macroName = StringRef();
@@ -296,18 +326,18 @@ namespace Catch {
 
     bool RunContext::sectionStarted(StringRef sectionName, SourceLineInfo const& sectionLineInfo, Counts & assertions) {
         ITracker& sectionTracker =
-            SectionTracker::acquire( m_trackerContext,
+            SectionTracker::acquire( m_impl->trackerContext,
                                      TestCaseTracking::NameAndLocationRef(
                                          sectionName, sectionLineInfo ) );
 
         if (!sectionTracker.isOpen())
             return false;
-        m_activeSections.push_back(&sectionTracker);
+        m_impl->activeSections.push_back(&sectionTracker);
 
         SectionInfo sectionInfo( sectionLineInfo, static_cast<std::string>(sectionName) );
         m_lastAssertionInfo.lineInfo = sectionInfo.lineInfo;
 
-        m_reporter->sectionStarting(sectionInfo);
+        m_impl->reporter->sectionStarting( sectionInfo );
 
         assertions = m_totals.assertions;
 
@@ -318,7 +348,7 @@ namespace Catch {
                                          SourceLineInfo const& lineInfo ) {
         using namespace Generators;
         GeneratorTracker* tracker = GeneratorTracker::acquire(
-            m_trackerContext,
+            m_impl->trackerContext,
             TestCaseTracking::NameAndLocationRef(
                  generatorName, lineInfo ) );
         m_lastAssertionInfo.lineInfo = lineInfo;
@@ -331,13 +361,13 @@ namespace Catch {
         Generators::GeneratorBasePtr&& generator ) {
 
         auto nameAndLoc = TestCaseTracking::NameAndLocation( static_cast<std::string>( generatorName ), lineInfo );
-        auto& currentTracker = m_trackerContext.currentTracker();
+        auto& currentTracker = m_impl->trackerContext.currentTracker();
         assert(
             currentTracker.nameAndLocation() != nameAndLoc &&
             "Trying to create tracker for a genreator that already has one" );
 
         auto newTracker = Catch::Detail::make_unique<Generators::GeneratorTracker>(
-            CATCH_MOVE(nameAndLoc), m_trackerContext, &currentTracker );
+            CATCH_MOVE(nameAndLoc), m_impl->trackerContext, &currentTracker );
         auto ret = newTracker.get();
         currentTracker.addChild( CATCH_MOVE( newTracker ) );
 
@@ -351,7 +381,7 @@ namespace Catch {
             return false;
         if (!m_config->warnAboutMissingAssertions())
             return false;
-        if (m_trackerContext.currentTracker().hasChildren())
+        if (m_impl->trackerContext.currentTracker().hasChildren())
             return false;
         m_totals.assertions.failed++;
         assertions.failed++;
@@ -362,50 +392,57 @@ namespace Catch {
         Counts assertions = m_totals.assertions - endInfo.prevAssertions;
         bool missingAssertions = testForMissingAssertions(assertions);
 
-        if (!m_activeSections.empty()) {
-            m_activeSections.back()->close();
-            m_activeSections.pop_back();
+        if (!m_impl->activeSections.empty()) {
+            m_impl->activeSections.back()->close();
+            m_impl->activeSections.pop_back();
         }
 
-        m_reporter->sectionEnded(SectionStats(CATCH_MOVE(endInfo.sectionInfo), assertions, endInfo.durationInSeconds, missingAssertions));
-        m_messages.clear();
-        m_messageScopes.clear();
+        m_impl->reporter->sectionEnded(
+            SectionStats( CATCH_MOVE( endInfo.sectionInfo ),
+                          assertions,
+                          endInfo.durationInSeconds,
+                          missingAssertions ) );
+        m_impl->messages.clear();
+        m_impl->messageScopes.clear();
     }
 
     void RunContext::sectionEndedEarly(SectionEndInfo&& endInfo) {
-        if ( m_unfinishedSections.empty() ) {
-            m_activeSections.back()->fail();
+        if ( m_impl->unfinishedSections.empty() ) {
+            m_impl->activeSections.back()->fail();
         } else {
-            m_activeSections.back()->close();
+            m_impl->activeSections.back()->close();
         }
-        m_activeSections.pop_back();
+        m_impl->activeSections.pop_back();
 
-        m_unfinishedSections.push_back(CATCH_MOVE(endInfo));
+        m_impl->unfinishedSections.push_back(CATCH_MOVE(endInfo));
     }
 
     void RunContext::benchmarkPreparing( StringRef name ) {
-        m_reporter->benchmarkPreparing(name);
+        m_impl->reporter->benchmarkPreparing( name );
     }
     void RunContext::benchmarkStarting( BenchmarkInfo const& info ) {
-        m_reporter->benchmarkStarting( info );
+        m_impl->reporter->benchmarkStarting( info );
     }
     void RunContext::benchmarkEnded( BenchmarkStats<> const& stats ) {
-        m_reporter->benchmarkEnded( stats );
+        m_impl->reporter->benchmarkEnded( stats );
     }
     void RunContext::benchmarkFailed( StringRef error ) {
-        m_reporter->benchmarkFailed( error );
+        m_impl->reporter->benchmarkFailed( error );
     }
 
     void RunContext::pushScopedMessage(MessageInfo const & message) {
-        m_messages.push_back(message);
+        m_impl->messages.push_back(message);
     }
 
     void RunContext::popScopedMessage(MessageInfo const & message) {
-        m_messages.erase(std::remove(m_messages.begin(), m_messages.end(), message), m_messages.end());
+        m_impl->messages.erase( std::remove( m_impl->messages.begin(),
+                                             m_impl->messages.end(),
+                                             message ),
+                                m_impl->messages.end() );
     }
 
     void RunContext::emplaceUnscopedMessage( MessageBuilder&& builder ) {
-        m_messageScopes.emplace_back( CATCH_MOVE(builder) );
+        m_impl->messageScopes.emplace_back( CATCH_MOVE(builder) );
     }
 
     std::string RunContext::getCurrentTestName() const {
@@ -415,7 +452,7 @@ namespace Catch {
     }
 
     const AssertionResult * RunContext::getLastResult() const {
-        return &(*m_lastResult);
+        return &(*m_impl->lastResult);
     }
 
     void RunContext::exceptionEarlyReported() {
@@ -424,7 +461,7 @@ namespace Catch {
 
     void RunContext::handleFatalErrorCondition( StringRef message ) {
         // First notify reporter that bad things happened
-        m_reporter->fatalErrorEncountered(message);
+        m_impl->reporter->fatalErrorEncountered(message);
 
         // Don't rebuild the result -- the stringification itself can cause more fatal errors
         // Instead, fake a result data.
@@ -443,20 +480,20 @@ namespace Catch {
         Counts assertions;
         assertions.failed = 1;
         SectionStats testCaseSectionStats(CATCH_MOVE(testCaseSection), assertions, 0, false);
-        m_reporter->sectionEnded(testCaseSectionStats);
+        m_impl->reporter->sectionEnded(testCaseSectionStats);
 
         auto const& testInfo = m_activeTestCase->getTestCaseInfo();
 
         Totals deltaTotals;
         deltaTotals.testCases.failed = 1;
         deltaTotals.assertions.failed = 1;
-        m_reporter->testCaseEnded(TestCaseStats(testInfo,
+        m_impl->reporter->testCaseEnded(TestCaseStats(testInfo,
                                   deltaTotals,
                                   std::string(),
                                   std::string(),
                                   false));
         m_totals.testCases.failed++;
-        m_reporter->testRunEnded(TestRunStats(m_runInfo, m_totals, false));
+        m_impl->reporter->testRunEnded(TestRunStats(m_runInfo, m_totals, false));
     }
 
     bool RunContext::lastAssertionPassed() {
@@ -467,7 +504,7 @@ namespace Catch {
         m_lastAssertionPassed = true;
         ++m_totals.assertions.passed;
         resetAssertionInfo();
-        m_messageScopes.clear();
+        m_impl->messageScopes.clear();
     }
 
     bool RunContext::aborting() const {
@@ -477,7 +514,7 @@ namespace Catch {
     void RunContext::runCurrentTest(std::string & redirectedCout, std::string & redirectedCerr) {
         auto const& testCaseInfo = m_activeTestCase->getTestCaseInfo();
         SectionInfo testCaseSection(testCaseInfo.lineInfo, testCaseInfo.name);
-        m_reporter->sectionStarting(testCaseSection);
+        m_impl->reporter->sectionStarting(testCaseSection);
         Counts prevAssertions = m_totals.assertions;
         double duration = 0;
         m_shouldReportUnexpected = true;
@@ -485,7 +522,7 @@ namespace Catch {
 
         Timer timer;
         CATCH_TRY {
-            if (m_reporter->getPreferences().shouldRedirectStdOut) {
+            if (m_impl->reporter->getPreferences().shouldRedirectStdOut) {
 #if !defined(CATCH_CONFIG_EXPERIMENTAL_REDIRECT)
                 RedirectedStreams redirectedStreams(redirectedCout, redirectedCerr);
 
@@ -518,18 +555,18 @@ namespace Catch {
 
         m_testCaseTracker->close();
         handleUnfinishedSections();
-        m_messages.clear();
-        m_messageScopes.clear();
+        m_impl->messages.clear();
+        m_impl->messageScopes.clear();
 
         SectionStats testCaseSectionStats(CATCH_MOVE(testCaseSection), assertions, duration, missingAssertions);
-        m_reporter->sectionEnded(testCaseSectionStats);
+        m_impl->reporter->sectionEnded(testCaseSectionStats);
     }
 
     void RunContext::invokeActiveTestCase() {
         // We need to engage a handler for signals/structured exceptions
         // before running the tests themselves, or the binary can crash
         // without failed test being reported.
-        FatalConditionHandlerGuard _(&m_fatalConditionhandler);
+        FatalConditionHandlerGuard _(&m_impl->fatalConditionhandler);
         // We keep having issue where some compilers warn about an unused
         // variable, even though the type has non-trivial constructor and
         // destructor. This is annoying and ugly, but it makes them stfu.
@@ -541,12 +578,12 @@ namespace Catch {
     void RunContext::handleUnfinishedSections() {
         // If sections ended prematurely due to an exception we stored their
         // infos here so we can tear them down outside the unwind process.
-        for (auto it = m_unfinishedSections.rbegin(),
-             itEnd = m_unfinishedSections.rend();
+        for (auto it = m_impl->unfinishedSections.rbegin(),
+             itEnd = m_impl->unfinishedSections.rend();
              it != itEnd;
              ++it)
             sectionEnded(CATCH_MOVE(*it));
-        m_unfinishedSections.clear();
+        m_impl->unfinishedSections.clear();
     }
 
     void RunContext::handleExpr(
@@ -554,7 +591,7 @@ namespace Catch {
         ITransientExpression const& expr,
         AssertionReaction& reaction
     ) {
-        m_reporter->assertionStarting( info );
+        m_impl->reporter->assertionStarting( info );
 
         bool negated = isFalseTest( info.resultDisposition );
         bool result = expr.getResult() != negated;
@@ -593,7 +630,7 @@ namespace Catch {
             StringRef message,
             AssertionReaction& reaction
     ) {
-        m_reporter->assertionStarting( info );
+        m_impl->reporter->assertionStarting( info );
 
         m_lastAssertionInfo = info;
 
@@ -619,13 +656,13 @@ namespace Catch {
 
     void RunContext::handleUnexpectedInflightException(
             AssertionInfo const& info,
-            std::string const& message,
+            std::string&& message,
             AssertionReaction& reaction
     ) {
         m_lastAssertionInfo = info;
 
         AssertionResultData data( ResultWas::ThrewException, LazyExpression( false ) );
-        data.message = message;
+        data.message = CATCH_MOVE(message);
         AssertionResult assertionResult{ info, CATCH_MOVE(data) };
         assertionEnded( assertionResult );
         populateReaction( reaction );
@@ -663,7 +700,7 @@ namespace Catch {
     }
 
 
-    IResultCapture& getResultCapture() {
+    RunContext& getResultCapture() {
         if (auto* capture = getCurrentContext().getResultCapture())
             return *capture;
         else

src/catch2/internal/catch_run_context.hpp

@@ -8,37 +8,60 @@
 #ifndef CATCH_RUN_CONTEXT_HPP_INCLUDED
 #define CATCH_RUN_CONTEXT_HPP_INCLUDED
 
-#include <catch2/interfaces/catch_interfaces_reporter.hpp>
-#include <catch2/internal/catch_test_registry.hpp>
-#include <catch2/internal/catch_fatal_condition_handler.hpp>
-#include <catch2/catch_test_case_info.hpp>
-#include <catch2/catch_message.hpp>
+#include <catch2/catch_test_run_info.hpp>
 #include <catch2/catch_totals.hpp>
-#include <catch2/internal/catch_test_case_tracker.hpp>
 #include <catch2/catch_assertion_info.hpp>
-#include <catch2/catch_assertion_result.hpp>
-#include <catch2/internal/catch_optional.hpp>
-#include <catch2/internal/catch_move_and_forward.hpp>
+#include <catch2/internal/catch_benchmark_stats_fwd.hpp>
+#include <catch2/internal/catch_unique_ptr.hpp>
 
 #include <string>
+#include <chrono>
 
 namespace Catch {
 
-    class IMutableContext;
+    class TestCaseHandle;
+    class AssertionResult;
+    struct AssertionInfo;
+    struct SectionInfo;
+    struct SectionEndInfo;
+    struct MessageInfo;
+    struct MessageBuilder;
+    struct Counts;
+    struct AssertionReaction;
+    struct SourceLineInfo;
+
+    class ITransientExpression;
+    class IGeneratorTracker;
+
+    struct BenchmarkInfo;
+
+    namespace Generators {
+        class GeneratorUntypedBase;
+        using GeneratorBasePtr = Catch::Detail::unique_ptr<GeneratorUntypedBase>;
+    }
+
+
     class IGeneratorTracker;
     class IConfig;
+    // Fixme: Take out the namespace?
+    namespace TestCaseTracking {
+        class ITracker;
+    }
+    using TestCaseTracking::ITracker;
 
-    ///////////////////////////////////////////////////////////////////////////
-
-    class RunContext : public IResultCapture {
+    class IEventListener;
+    using IEventListenerPtr = Detail::unique_ptr<IEventListener>;
 
+    class RunContext {
+        struct RunContextImpl;
+        Detail::unique_ptr<RunContextImpl> m_impl;
     public:
         RunContext( RunContext const& ) = delete;
         RunContext& operator =( RunContext const& ) = delete;
 
         explicit RunContext( IConfig const* _config, IEventListenerPtr&& reporter );
 
-        ~RunContext() override;
+        ~RunContext();
 
         Totals runTest(TestCaseHandle const& testCase);
 
@@ -48,63 +71,63 @@ namespace Catch {
         void handleExpr
                 (   AssertionInfo const& info,
                     ITransientExpression const& expr,
-                    AssertionReaction& reaction ) override;
+                    AssertionReaction& reaction );
         void handleMessage
                 (   AssertionInfo const& info,
                     ResultWas::OfType resultType,
                     StringRef message,
-                    AssertionReaction& reaction ) override;
+                    AssertionReaction& reaction );
         void handleUnexpectedExceptionNotThrown
                 (   AssertionInfo const& info,
-                    AssertionReaction& reaction ) override;
+                    AssertionReaction& reaction );
         void handleUnexpectedInflightException
                 (   AssertionInfo const& info,
-                    std::string const& message,
-                    AssertionReaction& reaction ) override;
+                    std::string&& message,
+                    AssertionReaction& reaction );
         void handleIncomplete
-                (   AssertionInfo const& info ) override;
+                (   AssertionInfo const& info );
         void handleNonExpr
                 (   AssertionInfo const &info,
                     ResultWas::OfType resultType,
-                    AssertionReaction &reaction ) override;
+                    AssertionReaction &reaction );
 
         bool sectionStarted( StringRef sectionName,
                              SourceLineInfo const& sectionLineInfo,
-                             Counts& assertions ) override;
+                             Counts& assertions );
 
-        void sectionEnded( SectionEndInfo&& endInfo ) override;
-        void sectionEndedEarly( SectionEndInfo&& endInfo ) override;
+        void sectionEnded( SectionEndInfo&& endInfo );
+        void sectionEndedEarly( SectionEndInfo&& endInfo );
 
         IGeneratorTracker*
         acquireGeneratorTracker( StringRef generatorName,
-                                 SourceLineInfo const& lineInfo ) override;
+                                 SourceLineInfo const& lineInfo );
         IGeneratorTracker* createGeneratorTracker(
             StringRef generatorName,
             SourceLineInfo lineInfo,
-            Generators::GeneratorBasePtr&& generator ) override;
+            Generators::GeneratorBasePtr&& generator );
 
 
-        void benchmarkPreparing( StringRef name ) override;
-        void benchmarkStarting( BenchmarkInfo const& info ) override;
-        void benchmarkEnded( BenchmarkStats<> const& stats ) override;
-        void benchmarkFailed( StringRef error ) override;
+        void benchmarkPreparing( StringRef name );
+        void benchmarkStarting( BenchmarkInfo const& info );
+        void benchmarkEnded( BenchmarkStats<> const& stats );
+        void benchmarkFailed( StringRef error );
 
-        void pushScopedMessage( MessageInfo const& message ) override;
-        void popScopedMessage( MessageInfo const& message ) override;
+        void pushScopedMessage( MessageInfo const& message );
+        void popScopedMessage( MessageInfo const& message );
 
-        void emplaceUnscopedMessage( MessageBuilder&& builder ) override;
+        void emplaceUnscopedMessage( MessageBuilder&& builder );
 
-        std::string getCurrentTestName() const override;
+        std::string getCurrentTestName() const;
 
-        const AssertionResult* getLastResult() const override;
+        const AssertionResult* getLastResult() const;
 
-        void exceptionEarlyReported() override;
+        void exceptionEarlyReported();
 
-        void handleFatalErrorCondition( StringRef message ) override;
+        void handleFatalErrorCondition( StringRef message );
 
-        bool lastAssertionPassed() override;
+        bool lastAssertionPassed();
 
-        void assertionPassed() override;
+        void assertionPassed();
 
     public:
         // !TBD We need to do this another way!
@@ -132,21 +155,12 @@ namespace Catch {
         void handleUnfinishedSections();
 
         TestRunInfo m_runInfo;
-        IMutableContext& m_context;
         TestCaseHandle const* m_activeTestCase = nullptr;
         ITracker* m_testCaseTracker = nullptr;
-        Optional<AssertionResult> m_lastResult;
 
         IConfig const* m_config;
         Totals m_totals;
-        IEventListenerPtr m_reporter;
-        std::vector<MessageInfo> m_messages;
-        std::vector<ScopedMessage> m_messageScopes; /* Keeps owners of so-called unscoped messages. */
         AssertionInfo m_lastAssertionInfo;
-        std::vector<SectionEndInfo> m_unfinishedSections;
-        std::vector<ITracker*> m_activeSections;
-        TrackerContext m_trackerContext;
-        FatalConditionHandler m_fatalConditionhandler;
         bool m_lastAssertionPassed = false;
         bool m_shouldReportUnexpected = true;
         bool m_includeSuccessfulResults;
@@ -154,6 +168,9 @@ namespace Catch {
 
     void seedRng(IConfig const& config);
     unsigned int rngSeed();
+
+    RunContext& getResultCapture();
+
 } // end namespace Catch
 
 #endif // CATCH_RUN_CONTEXT_HPP_INCLUDED

src/catch2/internal/catch_tag_alias_registry.cpp

@@ -8,16 +8,24 @@
 #include <catch2/internal/catch_tag_alias_registry.hpp>
 #include <catch2/internal/catch_console_colour.hpp>
 #include <catch2/internal/catch_enforce.hpp>
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 #include <catch2/internal/catch_string_manip.hpp>
 
-namespace Catch {
+#include <map>
 
-    TagAliasRegistry::~TagAliasRegistry() {}
+namespace Catch {
+    struct TagAliasRegistry::TagAliasRegistryImpl {
+        std::map<std::string, TagAlias> registry;
+    };
+
+
+    TagAliasRegistry::TagAliasRegistry():
+        m_impl( Detail::make_unique<TagAliasRegistryImpl>() ){}
+    TagAliasRegistry::~TagAliasRegistry() = default;
 
     TagAlias const* TagAliasRegistry::find( std::string const& alias ) const {
-        auto it = m_registry.find( alias );
-        if( it != m_registry.end() )
+        auto it = m_impl->registry.find( alias );
+        if( it != m_impl->registry.end() )
             return &(it->second);
         else
             return nullptr;
@@ -25,7 +33,7 @@ namespace Catch {
 
     std::string TagAliasRegistry::expandAliases( std::string const& unexpandedTestSpec ) const {
         std::string expandedTestSpec = unexpandedTestSpec;
-        for( auto const& registryKvp : m_registry ) {
+        for( auto const& registryKvp : m_impl->registry ) {
             std::size_t pos = expandedTestSpec.find( registryKvp.first );
             if( pos != std::string::npos ) {
                 expandedTestSpec =  expandedTestSpec.substr( 0, pos ) +
@@ -40,15 +48,13 @@ namespace Catch {
         CATCH_ENFORCE( startsWith(alias, "[@") && endsWith(alias, ']'),
                       "error: tag alias, '" << alias << "' is not of the form [@alias name].\n" << lineInfo );
 
-        CATCH_ENFORCE( m_registry.insert(std::make_pair(alias, TagAlias(tag, lineInfo))).second,
+        CATCH_ENFORCE( m_impl->registry.insert(std::make_pair(alias, TagAlias(tag, lineInfo))).second,
                       "error: tag alias, '" << alias << "' already registered.\n"
                       << "\tFirst seen at: " << find(alias)->lineInfo << "\n"
                       << "\tRedefined at: " << lineInfo );
     }
 
-    ITagAliasRegistry::~ITagAliasRegistry() = default;
-
-    ITagAliasRegistry const& ITagAliasRegistry::get() {
+    TagAliasRegistry const& TagAliasRegistry::get() {
         return getRegistryHub().getTagAliasRegistry();
     }
 

src/catch2/internal/catch_tag_alias_registry.hpp

@@ -8,24 +8,30 @@
 #ifndef CATCH_TAG_ALIAS_REGISTRY_HPP_INCLUDED
 #define CATCH_TAG_ALIAS_REGISTRY_HPP_INCLUDED
 
-#include <catch2/interfaces/catch_interfaces_tag_alias_registry.hpp>
 #include <catch2/catch_tag_alias.hpp>
+#include <catch2/internal/catch_unique_ptr.hpp>
 
-#include <map>
 #include <string>
 
 namespace Catch {
     struct SourceLineInfo;
 
-    class TagAliasRegistry : public ITagAliasRegistry {
+    class TagAliasRegistry {
+        struct TagAliasRegistryImpl;
+        Detail::unique_ptr<TagAliasRegistryImpl> m_impl;
     public:
-        ~TagAliasRegistry() override;
-        TagAlias const* find( std::string const& alias ) const override;
-        std::string expandAliases( std::string const& unexpandedTestSpec ) const override;
+        TagAliasRegistry();
+        ~TagAliasRegistry(); // = default;
+
+        //! Nullptr if not present
+        TagAlias const* find( std::string const& alias ) const;
+        //! Returns the test spec but with expanded aliases
+        std::string expandAliases( std::string const& unexpandedTestSpec ) const;
         void add( std::string const& alias, std::string const& tag, SourceLineInfo const& lineInfo );
 
+        static TagAliasRegistry const& get();
+
     private:
-        std::map<std::string, TagAlias> m_registry;
     };
 
 } // end namespace Catch

src/catch2/internal/catch_test_case_registry_impl.cpp

@@ -9,7 +9,8 @@
 
 #include <catch2/internal/catch_context.hpp>
 #include <catch2/internal/catch_enforce.hpp>
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+#include <catch2/interfaces/catch_interfaces_config.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 #include <catch2/internal/catch_random_number_generator.hpp>
 #include <catch2/internal/catch_run_context.hpp>
 #include <catch2/internal/catch_sharding.hpp>
@@ -23,6 +24,54 @@
 
 namespace Catch {
 
+    namespace {
+        static bool matchTest( TestCaseHandle const& testCase,
+                               TestSpec const& testSpec,
+                               IConfig const& config ) {
+            return testSpec.matches( testCase.getTestCaseInfo() ) &&
+                   isThrowSafe( testCase, config );
+        }
+
+        static void enforceNoDuplicateTestCases(
+            std::vector<TestCaseHandle> const& tests ) {
+            auto testInfoCmp = []( TestCaseInfo const* lhs,
+                                   TestCaseInfo const* rhs ) {
+                return *lhs < *rhs;
+            };
+            std::set<TestCaseInfo const*, decltype( testInfoCmp )&> seenTests(
+                testInfoCmp );
+            for ( auto const& test : tests ) {
+                const auto infoPtr = &test.getTestCaseInfo();
+                const auto prev = seenTests.insert( infoPtr );
+                CATCH_ENFORCE( prev.second,
+                               "error: test case \""
+                                   << infoPtr->name << "\", with tags \""
+                                   << infoPtr->tagsAsString()
+                                   << "\" already defined.\n"
+                                   << "\tFirst seen at "
+                                   << ( *prev.first )->lineInfo << "\n"
+                                   << "\tRedefined at " << infoPtr->lineInfo );
+            }
+        }
+    } // namespace
+
+    struct TestCaseRegistry::TestCaseRegistryImpl {
+        std::vector<Detail::unique_ptr<TestCaseInfo>> owned_test_infos;
+        // Keeps a materialized vector for `getAllInfos`.
+        // We should get rid of that eventually (see interface note)
+        std::vector<TestCaseInfo*> viewed_test_infos;
+
+        std::vector<Detail::unique_ptr<ITestInvoker>> invokers;
+        std::vector<TestCaseHandle> handles;
+        mutable TestRunOrder currentSortOrder = TestRunOrder::Declared;
+        mutable std::vector<TestCaseHandle> sortedFunctions;
+    };
+
+    TestCaseRegistry::TestCaseRegistry():
+        m_impl( Detail::make_unique<TestCaseRegistryImpl>() ) {}
+    TestCaseRegistry ::~TestCaseRegistry() = default;
+
+
     std::vector<TestCaseHandle> sortTests( IConfig const& config, std::vector<TestCaseHandle> const& unsortedTestCases ) {
         switch (config.runOrder()) {
         case TestRunOrder::Declared:
@@ -79,29 +128,6 @@ namespace Catch {
         return !testCase.getTestCaseInfo().throws() || config.allowThrows();
     }
 
-    bool matchTest( TestCaseHandle const& testCase, TestSpec const& testSpec, IConfig const& config ) {
-        return testSpec.matches( testCase.getTestCaseInfo() ) && isThrowSafe( testCase, config );
-    }
-
-    void
-    enforceNoDuplicateTestCases( std::vector<TestCaseHandle> const& tests ) {
-        auto testInfoCmp = []( TestCaseInfo const* lhs,
-                               TestCaseInfo const* rhs ) {
-            return *lhs < *rhs;
-        };
-        std::set<TestCaseInfo const*, decltype(testInfoCmp) &> seenTests(testInfoCmp);
-        for ( auto const& test : tests ) {
-            const auto infoPtr = &test.getTestCaseInfo();
-            const auto prev = seenTests.insert( infoPtr );
-            CATCH_ENFORCE(
-                prev.second,
-                "error: test case \"" << infoPtr->name << "\", with tags \""
-                    << infoPtr->tagsAsString() << "\" already defined.\n"
-                    << "\tFirst seen at " << ( *prev.first )->lineInfo << "\n"
-                    << "\tRedefined at " << infoPtr->lineInfo );
-        }
-    }
-
     std::vector<TestCaseHandle> filterTests( std::vector<TestCaseHandle> const& testCases, TestSpec const& testSpec, IConfig const& config ) {
         std::vector<TestCaseHandle> filtered;
         filtered.reserve( testCases.size() );
@@ -117,36 +143,29 @@ namespace Catch {
         return getRegistryHub().getTestCaseRegistry().getAllTestsSorted( config );
     }
 
-    void TestRegistry::registerTest(Detail::unique_ptr<TestCaseInfo> testInfo, Detail::unique_ptr<ITestInvoker> testInvoker) {
-        m_handles.emplace_back(testInfo.get(), testInvoker.get());
-        m_viewed_test_infos.push_back(testInfo.get());
-        m_owned_test_infos.push_back(CATCH_MOVE(testInfo));
-        m_invokers.push_back(CATCH_MOVE(testInvoker));
+    void TestCaseRegistry::registerTest(Detail::unique_ptr<TestCaseInfo> testInfo, Detail::unique_ptr<ITestInvoker> testInvoker) {
+        m_impl->handles.emplace_back(testInfo.get(), testInvoker.get());
+        m_impl->viewed_test_infos.push_back(testInfo.get());
+        m_impl->owned_test_infos.push_back(CATCH_MOVE(testInfo));
+        m_impl->invokers.push_back(CATCH_MOVE(testInvoker));
     }
 
-    std::vector<TestCaseInfo*> const& TestRegistry::getAllInfos() const {
-        return m_viewed_test_infos;
+    std::vector<TestCaseInfo*> const& TestCaseRegistry::getAllInfos() const {
+        return m_impl->viewed_test_infos;
     }
 
-    std::vector<TestCaseHandle> const& TestRegistry::getAllTests() const {
-        return m_handles;
+    std::vector<TestCaseHandle> const& TestCaseRegistry::getAllTests() const {
+        return m_impl->handles;
     }
-    std::vector<TestCaseHandle> const& TestRegistry::getAllTestsSorted( IConfig const& config ) const {
-        if( m_sortedFunctions.empty() )
-            enforceNoDuplicateTestCases( m_handles );
+    std::vector<TestCaseHandle> const& TestCaseRegistry::getAllTestsSorted( IConfig const& config ) const {
+        if( m_impl->sortedFunctions.empty() )
+            enforceNoDuplicateTestCases( m_impl->handles );
 
-        if(  m_currentSortOrder != config.runOrder() || m_sortedFunctions.empty() ) {
-            m_sortedFunctions = sortTests( config, m_handles );
-            m_currentSortOrder = config.runOrder();
+        if(  m_impl->currentSortOrder != config.runOrder() || m_impl->sortedFunctions.empty() ) {
+            m_impl->sortedFunctions = sortTests( config, m_impl->handles );
+            m_impl->currentSortOrder = config.runOrder();
         }
-        return m_sortedFunctions;
-    }
-
-
-
-    ///////////////////////////////////////////////////////////////////////////
-    void TestInvokerAsFunction::invoke() const {
-        m_testAsFunction();
+        return m_impl->sortedFunctions;
     }
 
 } // end namespace Catch

src/catch2/internal/catch_test_case_registry_impl.hpp

@@ -8,8 +8,7 @@
 #ifndef CATCH_TEST_CASE_REGISTRY_IMPL_HPP_INCLUDED
 #define CATCH_TEST_CASE_REGISTRY_IMPL_HPP_INCLUDED
 
-#include <catch2/internal/catch_test_registry.hpp>
-#include <catch2/interfaces/catch_interfaces_config.hpp>
+#include <catch2/internal/catch_unique_ptr.hpp>
 
 #include <vector>
 
@@ -18,49 +17,28 @@ namespace Catch {
     class TestCaseHandle;
     class IConfig;
     class TestSpec;
+    class ITestInvoker;
+    struct TestCaseInfo;
 
     std::vector<TestCaseHandle> sortTests( IConfig const& config, std::vector<TestCaseHandle> const& unsortedTestCases );
 
     bool isThrowSafe( TestCaseHandle const& testCase, IConfig const& config );
-    bool matchTest( TestCaseHandle const& testCase, TestSpec const& testSpec, IConfig const& config );
-
-    void enforceNoDuplicateTestCases( std::vector<TestCaseHandle> const& functions );
 
     std::vector<TestCaseHandle> filterTests( std::vector<TestCaseHandle> const& testCases, TestSpec const& testSpec, IConfig const& config );
     std::vector<TestCaseHandle> const& getAllTestCasesSorted( IConfig const& config );
 
-    class TestRegistry : public ITestCaseRegistry {
+    class TestCaseRegistry {
+        struct TestCaseRegistryImpl;
+        Detail::unique_ptr<TestCaseRegistryImpl> m_impl;
     public:
-        ~TestRegistry() override = default;
+        TestCaseRegistry();
+        ~TestCaseRegistry(); // = default;
 
         void registerTest( Detail::unique_ptr<TestCaseInfo> testInfo, Detail::unique_ptr<ITestInvoker> testInvoker );
 
-        std::vector<TestCaseInfo*> const& getAllInfos() const override;
-        std::vector<TestCaseHandle> const& getAllTests() const override;
-        std::vector<TestCaseHandle> const& getAllTestsSorted( IConfig const& config ) const override;
-
-    private:
-        std::vector<Detail::unique_ptr<TestCaseInfo>> m_owned_test_infos;
-        // Keeps a materialized vector for `getAllInfos`.
-        // We should get rid of that eventually (see interface note)
-        std::vector<TestCaseInfo*> m_viewed_test_infos;
-
-        std::vector<Detail::unique_ptr<ITestInvoker>> m_invokers;
-        std::vector<TestCaseHandle> m_handles;
-        mutable TestRunOrder m_currentSortOrder = TestRunOrder::Declared;
-        mutable std::vector<TestCaseHandle> m_sortedFunctions;
-    };
-
-    ///////////////////////////////////////////////////////////////////////////
-
-    class TestInvokerAsFunction final : public ITestInvoker {
-        using TestType = void(*)();
-        TestType m_testAsFunction;
-    public:
-        TestInvokerAsFunction(TestType testAsFunction) noexcept:
-            m_testAsFunction(testAsFunction) {}
-
-        void invoke() const override;
+        std::vector<TestCaseInfo*> const& getAllInfos() const;
+        std::vector<TestCaseHandle> const& getAllTests() const;
+        std::vector<TestCaseHandle> const& getAllTestsSorted( IConfig const& config ) const;
     };
 
     ///////////////////////////////////////////////////////////////////////////

src/catch2/internal/catch_test_failure_exception.cpp

@@ -20,4 +20,12 @@ namespace Catch {
 #endif
     }
 
+    void throw_test_skip_exception() {
+#if !defined( CATCH_CONFIG_DISABLE_EXCEPTIONS )
+        throw Catch::TestSkipException();
+#else
+        CATCH_ERROR( "Explicitly skipping tests during runtime requires exceptions" );
+#endif
+    }
+
 } // namespace Catch

src/catch2/internal/catch_test_failure_exception.hpp

@@ -12,6 +12,8 @@ namespace Catch {
 
     //! Used to signal that an assertion macro failed
     struct TestFailureException{};
+    //! Used to signal that the remainder of a test should be skipped
+    struct TestSkipException {};
 
     /**
      * Outlines throwing of `TestFailureException` into a single TU
@@ -20,8 +22,12 @@ namespace Catch {
      */
     [[noreturn]] void throw_test_failure_exception();
 
-    //! Used to signal that the remainder of a test should be skipped
-    struct TestSkipException{};
+    /**
+     * Outlines throwing of `TestSkipException` into a single TU
+     *
+     * Also handles `CATCH_CONFIG_DISABLE_EXCEPTIONS` for callers.
+     */
+    [[noreturn]] void throw_test_skip_exception();
 
 } // namespace Catch
 

src/catch2/internal/catch_test_macro_impl.hpp

@@ -10,7 +10,6 @@
 
 #include <catch2/catch_user_config.hpp>
 #include <catch2/internal/catch_assertion_handler.hpp>
-#include <catch2/interfaces/catch_interfaces_capture.hpp>
 #include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_source_line_info.hpp>
 

src/catch2/internal/catch_test_registry.cpp

@@ -8,8 +8,7 @@
 #include <catch2/internal/catch_test_registry.hpp>
 #include <catch2/internal/catch_compiler_capabilities.hpp>
 #include <catch2/catch_test_case_info.hpp>
-#include <catch2/internal/catch_test_case_registry_impl.hpp>
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 #include <catch2/internal/catch_string_manip.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 
@@ -19,7 +18,7 @@
 namespace Catch {
 
     namespace {
-        StringRef extractClassName( StringRef classOrMethodName ) {
+        static StringRef extractClassName( StringRef classOrMethodName ) {
             if ( !startsWith( classOrMethodName, '&' ) ) {
                 return classOrMethodName;
             }
@@ -46,6 +45,18 @@ namespace Catch {
                 static_cast<std::size_t>( startIdx ),
                 static_cast<std::size_t>( classNameSize ) );
         }
+
+        class TestInvokerAsFunction final : public ITestInvoker {
+            using TestType = void ( * )();
+            TestType m_testAsFunction;
+
+        public:
+            TestInvokerAsFunction( TestType testAsFunction ) noexcept:
+                m_testAsFunction( testAsFunction ) {}
+
+            void invoke() const override { m_testAsFunction(); }
+        };
+
     } // namespace
 
     Detail::unique_ptr<ITestInvoker> makeTestInvoker( void(*testAsFunction)() ) {

src/catch2/internal/catch_test_spec_parser.cpp

@@ -8,13 +8,13 @@
 #include <catch2/internal/catch_test_spec_parser.hpp>
 
 #include <catch2/internal/catch_string_manip.hpp>
-#include <catch2/interfaces/catch_interfaces_tag_alias_registry.hpp>
+#include <catch2/internal/catch_tag_alias_registry.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 
 
 namespace Catch {
 
-    TestSpecParser::TestSpecParser( ITagAliasRegistry const& tagAliases ) : m_tagAliases( &tagAliases ) {}
+    TestSpecParser::TestSpecParser( TagAliasRegistry const& tagAliases ) : m_tagAliases( &tagAliases ) {}
 
     TestSpecParser& TestSpecParser::parse( std::string const& arg ) {
         m_mode = None;

src/catch2/internal/catch_test_spec_parser.hpp

@@ -20,7 +20,7 @@
 
 namespace Catch {
 
-    class ITagAliasRegistry;
+    class TagAliasRegistry;
 
     class TestSpecParser {
         enum Mode{ None, Name, QuotedName, Tag, EscapedName };
@@ -35,10 +35,10 @@ namespace Catch {
         std::vector<std::size_t> m_escapeChars;
         TestSpec::Filter m_currentFilter;
         TestSpec m_testSpec;
-        ITagAliasRegistry const* m_tagAliases = nullptr;
+        TagAliasRegistry const* m_tagAliases = nullptr;
 
     public:
-        TestSpecParser( ITagAliasRegistry const& tagAliases );
+        TestSpecParser( TagAliasRegistry const& tagAliases );
 
         TestSpecParser& parse( std::string const& arg );
         TestSpec testSpec();

src/catch2/matchers/catch_matchers_vector.hpp

@@ -85,11 +85,10 @@ namespace Matchers {
             // - a more general approach would be via a compare template that defaults
             // to using !=. but could be specialised for, e.g. std::vector<T> etc
             // - then just call that directly
-            if (m_comparator.size() != v.size())
-                return false;
-            for (std::size_t i = 0; i < v.size(); ++i)
-                if (m_comparator[i] != v[i])
-                    return false;
+            if ( m_comparator.size() != v.size() ) { return false; }
+            for ( std::size_t i = 0; i < v.size(); ++i ) {
+                if ( !( m_comparator[i] == v[i] ) ) { return false; }
+            }
             return true;
         }
         std::string describe() const override {

src/catch2/matchers/internal/catch_matchers_impl.cpp

@@ -8,7 +8,7 @@
 
 #include <catch2/matchers/internal/catch_matchers_impl.hpp>
 #include <catch2/matchers/catch_matchers.hpp>
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 
 namespace Catch {

src/catch2/meson.build

@@ -56,18 +56,14 @@ internal_headers = [
   'generators/catch_generators_random.hpp',
   'generators/catch_generators_range.hpp',
   'interfaces/catch_interfaces_all.hpp',
-  'interfaces/catch_interfaces_capture.hpp',
   'interfaces/catch_interfaces_config.hpp',
-  'interfaces/catch_interfaces_enum_values_registry.hpp',
   'interfaces/catch_interfaces_exception.hpp',
   'interfaces/catch_interfaces_generatortracker.hpp',
-  'interfaces/catch_interfaces_registry_hub.hpp',
   'interfaces/catch_interfaces_reporter.hpp',
   'interfaces/catch_interfaces_reporter_factory.hpp',
-  'interfaces/catch_interfaces_reporter_registry.hpp',
-  'interfaces/catch_interfaces_tag_alias_registry.hpp',
   'interfaces/catch_interfaces_testcase.hpp',
   'internal/catch_assertion_handler.hpp',
+  'internal/catch_benchmark_stats_fwd.hpp',
   'internal/catch_case_insensitive_comparisons.hpp',
   'internal/catch_case_sensitive.hpp',
   'internal/catch_clara.hpp',
@@ -169,6 +165,7 @@ internal_headers = [
   'catch_template_test_macros.hpp',
   'catch_test_case_info.hpp',
   'catch_test_macros.hpp',
+  'catch_test_run_info.hpp',
   'catch_test_spec.hpp',
   'catch_timer.hpp',
   'catch_tostring.hpp',
@@ -182,14 +179,11 @@ internal_sources = files(
   'generators/catch_generator_exception.cpp',
   'generators/catch_generators.cpp',
   'generators/catch_generators_random.cpp',
-  'interfaces/catch_interfaces_capture.cpp',
   'interfaces/catch_interfaces_config.cpp',
   'interfaces/catch_interfaces_exception.cpp',
   'interfaces/catch_interfaces_generatortracker.cpp',
-  'interfaces/catch_interfaces_registry_hub.cpp',
   'interfaces/catch_interfaces_reporter.cpp',
   'interfaces/catch_interfaces_reporter_factory.cpp',
-  'interfaces/catch_interfaces_reporter_registry.cpp',
   'interfaces/catch_interfaces_testcase.cpp',
   'internal/catch_assertion_handler.cpp',
   'internal/catch_case_insensitive_comparisons.cpp',
@@ -217,6 +211,7 @@ internal_sources = files(
   'internal/catch_polyfills.cpp',
   'internal/catch_random_number_generator.cpp',
   'internal/catch_random_seed_generation.cpp',
+  'internal/catch_registry_hub.cpp',
   'internal/catch_reporter_registry.cpp',
   'internal/catch_reporter_spec_parser.cpp',
   'internal/catch_result_type.cpp',
@@ -254,7 +249,6 @@ internal_sources = files(
   'catch_config.cpp',
   'catch_get_random_seed.cpp',
   'catch_message.cpp',
-  'catch_registry_hub.cpp',
   'catch_session.cpp',
   'catch_tag_alias_autoregistrar.cpp',
   'catch_test_case_info.cpp',
@@ -262,6 +256,7 @@ internal_sources = files(
   'catch_timer.cpp',
   'catch_tostring.cpp',
   'catch_totals.cpp',
+  'catch_translate_exception.cpp',
   'catch_version.cpp',
 )
 

src/catch2/reporters/catch_reporter_junit.cpp

@@ -33,6 +33,8 @@ namespace Catch {
             gmtime_s(&timeInfo, &rawtime);
 #elif defined (CATCH_PLATFORM_PLAYSTATION)
             gmtime_s(&rawtime, &timeInfo);
+#elif defined (__IAR_SYSTEMS_ICC__)
+            timeInfo = *std::gmtime(&rawtime);
 #else
             gmtime_r(&rawtime, &timeInfo);
 #endif
@@ -293,7 +295,7 @@ namespace Catch {
                 }
             }
 
-            if( !result.getMessage().empty() )
+            if( result.hasMessage() )
                 rss << result.getMessage() << '\n';
             for( auto const& msg : stats.infoMessages )
                 if( msg.type == ResultWas::Info )

src/catch2/reporters/catch_reporter_multi.cpp

@@ -114,7 +114,6 @@ namespace Catch {
         }
     }
 
-    // The return value indicates if the messages buffer should be cleared:
     void MultiReporter::assertionEnded( AssertionStats const& assertionStats ) {
         const bool reportByDefault =
             assertionStats.assertionResult.getResultType() != ResultWas::Ok ||

src/catch2/reporters/catch_reporter_registrars.cpp

@@ -9,6 +9,7 @@
 #include <catch2/reporters/catch_reporter_registrars.hpp>
 
 #include <catch2/internal/catch_compiler_capabilities.hpp>
+#include <catch2/internal/catch_registry_hub.hpp>
 
 namespace Catch {
     namespace Detail {
@@ -26,5 +27,10 @@ namespace Catch {
             }
         }
 
+        void registerListenerImpl( Detail::unique_ptr<EventListenerFactory> listenerFactory ) {
+            getMutableRegistryHub().registerListener( CATCH_MOVE(listenerFactory) );
+        }
+
+
     } // namespace Detail
 } // namespace Catch

src/catch2/reporters/catch_reporter_registrars.hpp

@@ -8,7 +8,6 @@
 #ifndef CATCH_REPORTER_REGISTRARS_HPP_INCLUDED
 #define CATCH_REPORTER_REGISTRARS_HPP_INCLUDED
 
-#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
 #include <catch2/interfaces/catch_interfaces_reporter.hpp>
 #include <catch2/interfaces/catch_interfaces_reporter_factory.hpp>
 #include <catch2/internal/catch_compiler_capabilities.hpp>
@@ -36,7 +35,8 @@ namespace Catch {
         //! independent on the reporter's concrete type
         void registerReporterImpl( std::string const& name,
                                    IReporterFactoryPtr reporterPtr );
-
+        //! Actually registers the factory, independent on listener's concrete type
+        void registerListenerImpl( Detail::unique_ptr<EventListenerFactory> listenerFactory );
     } // namespace Detail
 
     class IEventListener;
@@ -97,7 +97,7 @@ namespace Catch {
 
     public:
         ListenerRegistrar(StringRef listenerName) {
-            getMutableRegistryHub().registerListener( Detail::make_unique<TypedListenerFactory>(listenerName) );
+            registerListenerImpl( Detail::make_unique<TypedListenerFactory>(listenerName) );
         }
     };
 }

src/catch2/reporters/catch_reporter_sonarqube.cpp

@@ -147,7 +147,7 @@ namespace Catch {
                 }
             }
 
-            if (!result.getMessage().empty())
+            if (result.hasMessage())
                 textRss << result.getMessage() << '\n';
 
             for (auto const& msg : stats.infoMessages)

tests/SelfTest/IntrospectiveTests/Reporters.tests.cpp

@@ -12,7 +12,6 @@
 #include <catch2/catch_config.hpp>
 #include <catch2/interfaces/catch_interfaces_reporter.hpp>
 #include <catch2/interfaces/catch_interfaces_reporter_factory.hpp>
-#include <catch2/interfaces/catch_interfaces_reporter_registry.hpp>
 #include <catch2/internal/catch_console_colour.hpp>
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/internal/catch_list.hpp>

tests/SelfTest/UsageTests/Matchers.tests.cpp

@@ -406,6 +406,25 @@ TEST_CASE( "Vector matchers that fail", "[matchers][vector][.][failing]" ) {
     }
 }
 
+namespace {
+    struct SomeType {
+        int i;
+        friend bool operator==( SomeType lhs, SomeType rhs ) {
+            return lhs.i == rhs.i;
+        }
+    };
+} // end anonymous namespace
+
+TEST_CASE( "Vector matcher with elements without !=", "[matchers][vector][approvals]" ) {
+    std::vector<SomeType> lhs, rhs;
+    lhs.push_back( { 1 } );
+    lhs.push_back( { 2 } );
+    rhs.push_back( { 1 } );
+    rhs.push_back( { 1 } );
+
+    REQUIRE_THAT( lhs, !Equals(rhs) );
+}
+
 TEST_CASE( "Exception matchers that succeed",
            "[matchers][exceptions][!throws]" ) {
     CHECK_THROWS_MATCHES(

tests/SelfTest/helpers/parse_test_spec.cpp

@@ -9,12 +9,12 @@
 #include <helpers/parse_test_spec.hpp>
 
 #include <catch2/internal/catch_test_spec_parser.hpp>
-#include <catch2/interfaces/catch_interfaces_tag_alias_registry.hpp>
+#include <catch2/internal/catch_tag_alias_registry.hpp>
 
 namespace Catch {
 
     TestSpec parseTestSpec( std::string const& arg ) {
-        return TestSpecParser( ITagAliasRegistry::get() )
+        return TestSpecParser( TagAliasRegistry::get() )
             .parse( arg )
             .testSpec();
     }