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-exception
5//
6//===----------------------------------------------------------------------===//
7
8// UNSUPPORTED: c++03, c++11, c++14, c++17
9// XFAIL: !has-64-bit-atomics
10
11// integral-type operator&=(integral-type) const noexcept;
12
13#include <atomic>
14#include <cassert>
15#include <concepts>
16#include <type_traits>
17#include <utility>
18
19#include "atomic_helpers.h"
20#include "test_macros.h"
21
22template <typename T>
23concept has_bitwise_and_assign = requires { std::declval<T const>() &= std::declval<T>(); };
24
25template <typename T>
26struct TestDoesNotHaveBitwiseAndAssign {
27 void operator()() const { static_assert(!has_bitwise_and_assign<std::atomic_ref<T>>); }
28};
29
30template <typename T>
31struct TestBitwiseAndAssign {
32 void operator()() const {
33 static_assert(std::is_integral_v<T>);
34
35 T x(T(1));
36 std::atomic_ref<T> const a(x);
37
38 std::same_as<T> decltype(auto) y = (a &= T(1));
39 assert(y == T(1));
40 assert(x == T(1));
41 ASSERT_NOEXCEPT(a &= T(0));
42
43 y = (a &= T(2));
44 assert(y == T(0));
45 assert(x == T(0));
46 }
47};
48
49int main(int, char**) {
50 TestEachIntegralType<TestBitwiseAndAssign>()();
51
52 TestEachFloatingPointType<TestDoesNotHaveBitwiseAndAssign>()();
53
54 TestEachPointerType<TestDoesNotHaveBitwiseAndAssign>()();
55
56 TestDoesNotHaveBitwiseAndAssign<bool>()();
57 TestDoesNotHaveBitwiseAndAssign<UserAtomicType>()();
58 TestDoesNotHaveBitwiseAndAssign<LargeUserAtomicType>()();
59
60 return 0;
61}
62

source code of libcxx/test/std/atomics/atomics.ref/bitwise_and_assign.pass.cpp