mirror of https://github.com/catchorg/Catch2.git
75 lines
3.2 KiB
C++
75 lines
3.2 KiB
C++
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// Copyright Catch2 Authors
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.txt or copy at
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// https://www.boost.org/LICENSE_1_0.txt)
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// SPDX-License-Identifier: BSL-1.0
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#include <catch2/catch_test_macros.hpp>
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#include <catch2/internal/catch_compare_traits.hpp>
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// Should only be constructible from literal 0.
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// Used by `TypeWithLit0Comparisons` for testing comparison
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// ops that only work with literal zero, the way std::*orderings do
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struct ZeroLiteralDetector {
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constexpr ZeroLiteralDetector( ZeroLiteralDetector* ) noexcept {}
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template <typename T,
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typename = std::enable_if_t<!std::is_same<T, int>::value>>
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constexpr ZeroLiteralDetector( T ) = delete;
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};
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struct TypeWithLit0Comparisons {
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#define DEFINE_COMP_OP( op ) \
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friend bool operator op( TypeWithLit0Comparisons, ZeroLiteralDetector ) { \
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return true; \
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} \
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friend bool operator op( ZeroLiteralDetector, TypeWithLit0Comparisons ) { \
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return false; \
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}
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DEFINE_COMP_OP( < )
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DEFINE_COMP_OP( <= )
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DEFINE_COMP_OP( > )
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DEFINE_COMP_OP( >= )
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DEFINE_COMP_OP( == )
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DEFINE_COMP_OP( != )
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#undef DEFINE_COMP_OP
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};
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#define ADD_TRAIT_TEST_CASE( op ) \
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TEST_CASE( "is_" #op "_comparable", \
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"[traits][is_comparable][approvals]" ) { \
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using Catch::Detail::is_##op##_0_comparable; \
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using Catch::Detail::is_##op##_comparable; \
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\
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STATIC_REQUIRE( is_##op##_comparable<int, int>::value ); \
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STATIC_REQUIRE( \
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is_##op##_comparable<std::string, std::string>::value ); \
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STATIC_REQUIRE( !is_##op##_comparable<int, std::string>::value ); \
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STATIC_REQUIRE( \
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!is_##op##_comparable<TypeWithLit0Comparisons, int>::value ); \
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STATIC_REQUIRE( \
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!is_##op##_comparable<int, TypeWithLit0Comparisons>::value ); \
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\
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STATIC_REQUIRE( is_##op##_0_comparable<int>::value ); \
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STATIC_REQUIRE( \
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is_##op##_0_comparable<TypeWithLit0Comparisons>::value ); \
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STATIC_REQUIRE( !is_##op##_0_comparable<std::string>::value ); \
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\
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/* This test fails with MSVC in permissive mode, because of course it does */ \
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/* STATIC_REQUIRE( !is_##op##_0_comparable<int*>::value ); */ \
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}
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ADD_TRAIT_TEST_CASE(lt)
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ADD_TRAIT_TEST_CASE(gt)
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ADD_TRAIT_TEST_CASE(le)
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ADD_TRAIT_TEST_CASE(ge)
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ADD_TRAIT_TEST_CASE(eq)
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ADD_TRAIT_TEST_CASE(ne)
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#undef ADD_TRAIT_TEST_CASE
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