63 lines · cpp
1//2// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.3// See https://llvm.org/LICENSE.txt for license information.4// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception5//6//===----------------------------------------------------------------------===//7 8// UNSUPPORTED: c++03, c++11, c++14, c++179// XFAIL: !has-64-bit-atomics10// XFAIL: !has-1024-bit-atomics11 12// T load(memory_order = memory_order::seq_cst) const noexcept;13 14#include <atomic>15#include <concepts>16#include <cassert>17#include <type_traits>18 19#include "atomic_helpers.h"20#include "test_helper.h"21#include "test_macros.h"22 23template <typename T>24struct TestLoad {25 void operator()() const {26 T x(T(1));27 std::atomic_ref<T> const a(x);28 29 {30 std::same_as<T> decltype(auto) y = a.load();31 assert(y == T(1));32 ASSERT_NOEXCEPT(a.load());33 }34 35 {36 std::same_as<T> decltype(auto) y = a.load(std::memory_order_seq_cst);37 assert(y == T(1));38 ASSERT_NOEXCEPT(a.load(std::memory_order_seq_cst));39 }40 41 // memory_order::seq_cst42 {43 auto store = [](std::atomic_ref<T> const& y, T, T new_val) { y.store(new_val); };44 auto load_no_arg = [](std::atomic_ref<T> const& y) { return y.load(); };45 auto load_with_order = [](std::atomic_ref<T> const& y) { return y.load(std::memory_order::seq_cst); };46 test_seq_cst<T>(store, load_no_arg);47 test_seq_cst<T>(store, load_with_order);48 }49 50 // memory_order::release51 {52 auto store = [](std::atomic_ref<T> const& y, T, T new_val) { y.store(new_val, std::memory_order::release); };53 auto load = [](std::atomic_ref<T> const& y) { return y.load(std::memory_order::acquire); };54 test_acquire_release<T>(store, load);55 }56 }57};58 59int main(int, char**) {60 TestEachAtomicType<TestLoad>()();61 return 0;62}63