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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: no-threads
// <memory>
// shared_ptr
// template <class T>
// bool
// atomic_compare_exchange_weak(shared_ptr<T>* p, shared_ptr<T>* v,
// shared_ptr<T> w);
// UNSUPPORTED: c++03
#include <memory>
#include <cassert>
#include "test_macros.h"
int main(int, char**)
{
{
std::shared_ptr<int> p(new int(4));
std::shared_ptr<int> v(new int(3));
std::shared_ptr<int> w(new int(2));
bool b = std::atomic_compare_exchange_weak(&p, &v, w);
assert(b == false);
assert(*p == 4);
assert(*v == 4);
assert(*w == 2);
}
{
std::shared_ptr<int> p(new int(4));
std::shared_ptr<int> v = p;
std::shared_ptr<int> w(new int(2));
bool b = std::atomic_compare_exchange_weak(&p, &v, w);
assert(b == true);
assert(*p == 2);
assert(*v == 4);
assert(*w == 2);
}
return 0;
}
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