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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
// <numeric>
// template<class R, class T>
// constexpr R saturate_cast(T x) noexcept; // freestanding
#include <concepts>
#include <numeric>
#include "test_macros.h"
template <typename R, typename T>
concept CanDo = requires(T x) {
{ std::saturate_cast<R>(x) } -> std::same_as<R>;
};
template <typename R, typename T>
constexpr void test_constraint_success() {
static_assert(CanDo<R, T>);
static_assert(CanDo<T, T>);
static_assert(CanDo<T, R>);
}
template <typename T>
constexpr void test_constraint_fail() {
using I = int;
using R = T;
static_assert(!CanDo<R, T>);
static_assert(!CanDo<T, R>);
static_assert(!CanDo<I, T>);
static_assert(!CanDo<T, I>);
}
constexpr void test() {
// Contraint success - Signed
using SI = long long int;
test_constraint_success<SI, signed char>();
test_constraint_success<SI, short int>();
test_constraint_success<SI, signed char>();
test_constraint_success<SI, short int>();
test_constraint_success<SI, int>();
test_constraint_success<SI, long int>();
test_constraint_success<int, long long int>();
#ifndef TEST_HAS_NO_INT128
test_constraint_success<__int128_t, SI>();
#endif
// Contraint success - Unsigned
using UI = unsigned long long int;
test_constraint_success<UI, unsigned char>();
test_constraint_success<UI, unsigned short int>();
test_constraint_success<UI, unsigned int>();
test_constraint_success<UI, unsigned long int>();
test_constraint_success<unsigned int, unsigned long long int>();
#ifndef TEST_HAS_NO_INT128
test_constraint_success<UI, __uint128_t>();
#endif
// Contraint failure
test_constraint_fail<bool>();
test_constraint_fail<char>();
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test_constraint_fail<wchar_t>();
#endif
test_constraint_fail<char8_t>();
test_constraint_fail<char16_t>();
test_constraint_fail<char32_t>();
test_constraint_fail<float>();
test_constraint_fail<double>();
test_constraint_fail<long double>();
}
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