//===----------------------------------------------------------------------===//
//
// 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
// XFAIL: !has-64-bit-atomics
// static constexpr bool is_always_lock_free = implementation-defined;
// bool is_lock_free() const volatile noexcept;
// bool is_lock_free() const noexcept;
#include <atomic>
#include <cassert>
#include <concepts>
#include <type_traits>
#include "test_macros.h"
template <class T>
concept isLockFreeNoexcept = requires(T t) {
{ t.is_lock_free() } noexcept;
};
template <class T>
void test() {
static_assert(isLockFreeNoexcept<const std::atomic<T>&>);
static_assert(isLockFreeNoexcept<const volatile std::atomic<T>&>);
// static constexpr bool is_always_lock_free = implementation-defined;
{ [[maybe_unused]] constexpr std::same_as<const bool> decltype(auto) r = std::atomic<T>::is_always_lock_free; }
// bool is_lock_free() const volatile noexcept;
{
const volatile std::atomic<T> a;
std::same_as<bool> decltype(auto) r = a.is_lock_free();
if (std::atomic<T>::is_always_lock_free) {
assert(r);
}
}
// bool is_lock_free() const noexcept;
{
const std::atomic<T> a;
std::same_as<bool> decltype(auto) r = a.is_lock_free();
if (std::atomic<T>::is_always_lock_free) {
assert(r);
}
}
}
int main(int, char**) {
test<float>();
test<double>();
// TODO https://github.com/llvm/llvm-project/issues/47978
// test<long double>();
return 0;
}