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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
// UNSUPPORTED: c++98, c++03
// <future>
// class packaged_task<R(ArgTypes...)>
// template <class R, class... ArgTypes>
// void
// swap(packaged_task<R(ArgTypes...)>& x, packaged_task<R(ArgTypes...)>& y);
#include <future>
#include <cassert>
#include "test_macros.h"
class A
{
long data_;
public:
explicit A(long i) : data_(i) {}
long operator()(long i, long j) const {return data_ + i + j;}
};
int main(int, char**)
{
{
std::packaged_task<double(int, char)> p0(A(5));
std::packaged_task<double(int, char)> p;
swap(p, p0);
assert(!p0.valid());
assert(p.valid());
std::future<double> f = p.get_future();
p(3, 'a');
assert(f.get() == 105.0);
}
{
std::packaged_task<double(int, char)> p0;
std::packaged_task<double(int, char)> p;
swap(p, p0);
assert(!p0.valid());
assert(!p.valid());
}
return 0;
}
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