mirror of https://github.com/catchorg/Catch2.git
50 lines
1.8 KiB
C++
50 lines
1.8 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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#ifndef CATCH_TEST_HELPERS_TYPE_WITH_LIT_0_COMPARISONS_HPP_INCLUDED
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#define CATCH_TEST_HELPERS_TYPE_WITH_LIT_0_COMPARISONS_HPP_INCLUDED
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#include <type_traits>
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// Should only be constructible from literal 0.
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// Based on the constructor from pointer trick, used by libstdc++ and libc++
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// (formerly also MSVC, but they've moved to consteval int constructor).
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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 ZeroLiteralAsPointer {
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constexpr ZeroLiteralAsPointer( ZeroLiteralAsPointer* ) 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 ZeroLiteralAsPointer( 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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constexpr friend bool operator op( TypeWithLit0Comparisons, \
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ZeroLiteralAsPointer ) { \
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return true; \
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} \
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constexpr friend bool operator op( ZeroLiteralAsPointer, \
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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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#endif // CATCH_TEST_HELPERS_TYPE_WITH_LIT_0_COMPARISONS_HPP_INCLUDED
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