f7cab64684
This simplifies the tests a little bit:
Fixed -> TODO(LLVM20): remove [[maybe_unused]] and `{}` scope since all
supported compilers support "Placeholder variables with no name"
*IMPORTANT: Requires Apple Clang with [P2169R4: A nice placeholder with
no name](https://wg21.link/P2169R4)*
---------
Co-authored-by: Hristo Hristov <zingam@outlook.com>
80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// REQUIRES: std-at-least-c++26
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// <numeric>
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// template<class R, class T>
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// constexpr R saturate_cast(T x) noexcept; // freestanding
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#include <concepts>
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#include <numeric>
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#include "test_macros.h"
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template <typename R, typename T>
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concept CanDo = requires(T x) {
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{ std::saturate_cast<R>(x) } -> std::same_as<R>;
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};
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template <typename R, typename T>
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constexpr void test_constraint_success() {
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static_assert(CanDo<R, T>);
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static_assert(CanDo<T, T>);
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static_assert(CanDo<T, R>);
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}
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template <typename T>
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constexpr void test_constraint_fail() {
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using I = int;
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using R = T;
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static_assert(!CanDo<R, T>);
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static_assert(!CanDo<T, R>);
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static_assert(!CanDo<I, T>);
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static_assert(!CanDo<T, I>);
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}
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constexpr void test() {
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// Contraint success - Signed
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using SI = long long int;
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test_constraint_success<SI, signed char>();
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test_constraint_success<SI, short int>();
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test_constraint_success<SI, signed char>();
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test_constraint_success<SI, short int>();
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test_constraint_success<SI, int>();
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test_constraint_success<SI, long int>();
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test_constraint_success<int, long long int>();
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#ifndef TEST_HAS_NO_INT128
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test_constraint_success<__int128_t, SI>();
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#endif
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// Contraint success - Unsigned
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using UI = unsigned long long int;
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test_constraint_success<UI, unsigned char>();
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test_constraint_success<UI, unsigned short int>();
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test_constraint_success<UI, unsigned int>();
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test_constraint_success<UI, unsigned long int>();
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test_constraint_success<unsigned int, unsigned long long int>();
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#ifndef TEST_HAS_NO_INT128
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test_constraint_success<UI, __uint128_t>();
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#endif
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// Contraint failure
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test_constraint_fail<bool>();
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test_constraint_fail<char>();
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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test_constraint_fail<wchar_t>();
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#endif
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test_constraint_fail<char8_t>();
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test_constraint_fail<char16_t>();
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test_constraint_fail<char32_t>();
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test_constraint_fail<float>();
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test_constraint_fail<double>();
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test_constraint_fail<long double>();
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}
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