fbd2365c46
Adapted from libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/exchange.pass.cpp as we did for testing other functionalities. Spotted that lapse in coverage when working on #121414.
69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
//
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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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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// XFAIL: !has-64-bit-atomics
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// XFAIL: !has-1024-bit-atomics
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// T exchange(T, memory_order = memory_order::seq_cst) const noexcept;
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#include <atomic>
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#include <cassert>
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#include <concepts>
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#include <type_traits>
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#include "atomic_helpers.h"
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#include "test_helper.h"
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#include "test_macros.h"
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template <typename T>
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struct TestExchange {
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void operator()() const {
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{
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T x(T(1));
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std::atomic_ref<T> const a(x);
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{
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std::same_as<T> decltype(auto) y = a.exchange(T(2));
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assert(y == T(1));
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ASSERT_NOEXCEPT(a.exchange(T(2)));
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}
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{
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std::same_as<T> decltype(auto) y = a.exchange(T(3), std::memory_order_seq_cst);
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assert(y == T(2));
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ASSERT_NOEXCEPT(a.exchange(T(3), std::memory_order_seq_cst));
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}
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}
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// memory_order::release
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{
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auto exchange = [](std::atomic_ref<T> const& x, T, T new_val) {
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x.exchange(new_val, std::memory_order::release);
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};
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auto load = [](std::atomic_ref<T> const& x) { return x.load(std::memory_order::acquire); };
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test_acquire_release<T>(exchange, load);
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}
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// memory_order::seq_cst
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{
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auto exchange_no_arg = [](std::atomic_ref<T> const& x, T, T new_val) { x.exchange(new_val); };
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auto exchange_with_order = [](std::atomic_ref<T> const& x, T, T new_val) {
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x.exchange(new_val, std::memory_order::seq_cst);
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};
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auto load = [](std::atomic_ref<T> const& x) { return x.load(); };
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test_seq_cst<T>(exchange_no_arg, load);
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test_seq_cst<T>(exchange_with_order, load);
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}
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}
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};
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int main(int, char**) {
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TestEachAtomicType<TestExchange>()();
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return 0;
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}
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