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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: libcpp-has-no-threads
// <atomic>
// template<class T>
// T
// atomic_fetch_sub(volatile atomic<T>*, atomic<T>::difference_type) noexcept;
//
// template<class T>
// T
// atomic_fetch_sub(atomic<T>*, atomic<T>::difference_type) noexcept;
#include <atomic>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include "atomic_helpers.h"
template <class T>
struct TestFn {
void operator()() const {
{
typedef std::atomic<T> A;
A t(T(3));
assert(std::atomic_fetch_sub(&t, T(2)) == T(3));
assert(t == T(1));
ASSERT_NOEXCEPT(std::atomic_fetch_sub(&t, 0));
}
{
typedef std::atomic<T> A;
volatile A t(T(3));
assert(std::atomic_fetch_sub(&t, T(2)) == T(3));
assert(t == T(1));
ASSERT_NOEXCEPT(std::atomic_fetch_sub(&t, 0));
}
}
};
template <class T>
void testp()
{
{
typedef std::atomic<T> A;
typedef typename std::remove_pointer<T>::type X;
X a[3] = {0};
A t(&a[2]);
assert(std::atomic_fetch_sub(&t, 2) == &a[2]);
std::atomic_fetch_sub<T>(&t, 0);
assert(t == &a[0]);
ASSERT_NOEXCEPT(std::atomic_fetch_sub(&t, 0));
}
{
typedef std::atomic<T> A;
typedef typename std::remove_pointer<T>::type X;
X a[3] = {0};
volatile A t(&a[2]);
assert(std::atomic_fetch_sub(&t, 2) == &a[2]);
std::atomic_fetch_sub<T>(&t, 0);
assert(t == &a[0]);
ASSERT_NOEXCEPT(std::atomic_fetch_sub(&t, 0));
}
}
int main(int, char**)
{
TestEachIntegralType<TestFn>()();
testp<int*>();
testp<const int*>();
return 0;
}