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Add traits for checking whether types are comparable

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This commit is contained in:
Martin Hořeňovský
2022-11-01 08:48:23 +01:00
parent b3dbd83da2
commit d7f8c36e4c
7 changed files with 126 additions and 0 deletions
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1
tests/CMakeLists.txt
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@@ -99,6 +99,7 @@ set(TEST_SOURCES
${SELF_TEST_DIR}/IntrospectiveTests/String.tests.cpp
${SELF_TEST_DIR}/IntrospectiveTests/StringManip.tests.cpp
${SELF_TEST_DIR}/IntrospectiveTests/Xml.tests.cpp
${SELF_TEST_DIR}/IntrospectiveTests/Traits.tests.cpp
${SELF_TEST_DIR}/IntrospectiveTests/ToString.tests.cpp
${SELF_TEST_DIR}/IntrospectiveTests/UniquePtr.tests.cpp
${SELF_TEST_DIR}/helpers/parse_test_spec.cpp

74
tests/SelfTest/IntrospectiveTests/Traits.tests.cpp Normal file
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@@ -0,0 +1,74 @@
// 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_test_macros.hpp>
#include <catch2/internal/catch_compare_traits.hpp>
// Should only be constructible from literal 0.
// Used by `TypeWithLit0Comparisons` for testing comparison
// ops that only work with literal zero, the way std::*orderings do
struct ZeroLiteralDetector {
constexpr ZeroLiteralDetector( ZeroLiteralDetector* ) noexcept {}
template <typename T,
typename = std::enable_if_t<!std::is_same<T, int>::value>>
constexpr ZeroLiteralDetector( T ) = delete;
};
struct TypeWithLit0Comparisons {
#define DEFINE_COMP_OP( op ) \
friend bool operator op( TypeWithLit0Comparisons, ZeroLiteralDetector ) { \
return true; \
} \
friend bool operator op( ZeroLiteralDetector, TypeWithLit0Comparisons ) { \
return false; \
}
DEFINE_COMP_OP( < )
DEFINE_COMP_OP( <= )
DEFINE_COMP_OP( > )
DEFINE_COMP_OP( >= )
DEFINE_COMP_OP( == )
DEFINE_COMP_OP( != )
#undef DEFINE_COMP_OP
};
#define ADD_TRAIT_TEST_CASE( op ) \
TEST_CASE( "is_" #op "_comparable", \
"[traits][is_comparable][approvals]" ) { \
using Catch::Detail::is_##op##_0_comparable; \
using Catch::Detail::is_##op##_comparable; \
\
STATIC_REQUIRE( is_##op##_comparable<int, int>::value ); \
STATIC_REQUIRE( \
is_##op##_comparable<std::string, std::string>::value ); \
STATIC_REQUIRE( !is_##op##_comparable<int, std::string>::value ); \
STATIC_REQUIRE( \
!is_##op##_comparable<TypeWithLit0Comparisons, int>::value ); \
STATIC_REQUIRE( \
!is_##op##_comparable<int, TypeWithLit0Comparisons>::value ); \
\
STATIC_REQUIRE( is_##op##_0_comparable<int>::value ); \
STATIC_REQUIRE( \
is_##op##_0_comparable<TypeWithLit0Comparisons>::value ); \
STATIC_REQUIRE( !is_##op##_0_comparable<std::string>::value ); \
\
/* This test fails with MSVC in permissive mode, because of course it does */ \
/* STATIC_REQUIRE( !is_##op##_0_comparable<int*>::value ); */ \
}
ADD_TRAIT_TEST_CASE(lt)
ADD_TRAIT_TEST_CASE(gt)
ADD_TRAIT_TEST_CASE(le)
ADD_TRAIT_TEST_CASE(ge)
ADD_TRAIT_TEST_CASE(eq)
ADD_TRAIT_TEST_CASE(ne)
#undef ADD_TRAIT_TEST_CASE

1
tests/meson.build
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@@ -31,6 +31,7 @@ self_test_sources = files(
'SelfTest/IntrospectiveTests/TestSpecParser.tests.cpp',
'SelfTest/IntrospectiveTests/TextFlow.tests.cpp',
'SelfTest/IntrospectiveTests/ToString.tests.cpp',
'SelfTest/IntrospectiveTests/Traits.tests.cpp',
'SelfTest/IntrospectiveTests/UniquePtr.tests.cpp',
'SelfTest/IntrospectiveTests/Xml.tests.cpp',
'SelfTest/TestRegistrations.cpp',