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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
// XFAIL: !has-64-bit-atomics
// integral-type operator-=(integral-type) const noexcept;
// floating-point-type operator-=(floating-point-type) const noexcept;
// T* operator-=(difference_type) const noexcept;
#include <atomic>
#include <cassert>
#include <concepts>
#include <type_traits>
#include "atomic_helpers.h"
#include "test_helper.h"
#include "test_macros.h"
template <typename T>
concept has_operator_minus_equals = requires { std::declval<T const>() -= std::declval<T>(); };
template <typename T>
struct TestDoesNotHaveOperatorMinusEquals {
void operator()() const { static_assert(!has_operator_minus_equals<std::atomic_ref<T>>); }
};
template <typename T>
struct TestOperatorMinusEquals {
void operator()() const {
if constexpr (std::is_arithmetic_v<T>) {
T x(T(3));
std::atomic_ref<T> const a(x);
std::same_as<T> decltype(auto) y = (a -= T(2));
assert(y == T(1));
assert(x == T(1));
ASSERT_NOEXCEPT(a -= T(0));
} else if constexpr (std::is_pointer_v<T>) {
using U = std::remove_pointer_t<T>;
U t[9] = {};
T p{&t[3]};
std::atomic_ref<T> const a(p);
std::same_as<T> decltype(auto) y = (a -= 2);
assert(y == &t[1]);
assert(a == &t[1]);
ASSERT_NOEXCEPT(a -= 0);
} else {
static_assert(std::is_void_v<T>);
}
// memory_order::seq_cst
{
auto minus_equals = [](std::atomic_ref<T> const& x, T old_val, T new_val) { x -= (old_val - new_val); };
auto load = [](std::atomic_ref<T> const& x) { return x.load(); };
test_seq_cst<T>(minus_equals, load);
}
}
};
int main(int, char**) {
TestEachIntegralType<TestOperatorMinusEquals>()();
TestOperatorMinusEquals<float>()();
TestOperatorMinusEquals<double>()();
TestEachPointerType<TestOperatorMinusEquals>()();
TestDoesNotHaveOperatorMinusEquals<bool>()();
TestDoesNotHaveOperatorMinusEquals<UserAtomicType>()();
TestDoesNotHaveOperatorMinusEquals<LargeUserAtomicType>()();
return 0;
}
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