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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
// UNSUPPORTED: c++03
// <future>
// class promise<R>
// void swap(promise& other);
// template <class R> void swap(promise<R>& x, promise<R>& y);
#include <future>
#include <cassert>
#include "test_macros.h"
#include "test_allocator.h"
int main(int, char**)
{
test_allocator_statistics alloc_stats;
assert(alloc_stats.alloc_count == 0);
{
std::promise<int> p0(std::allocator_arg, test_allocator<int>(&alloc_stats));
std::promise<int> p(std::allocator_arg, test_allocator<int>(&alloc_stats));
assert(alloc_stats.alloc_count == 2);
p.swap(p0);
assert(alloc_stats.alloc_count == 2);
std::future<int> f = p.get_future();
assert(alloc_stats.alloc_count == 2);
assert(f.valid());
f = p0.get_future();
assert(f.valid());
assert(alloc_stats.alloc_count == 2);
}
assert(alloc_stats.alloc_count == 0);
{
std::promise<int> p0(std::allocator_arg, test_allocator<int>(&alloc_stats));
std::promise<int> p(std::allocator_arg, test_allocator<int>(&alloc_stats));
assert(alloc_stats.alloc_count == 2);
swap(p, p0);
assert(alloc_stats.alloc_count == 2);
std::future<int> f = p.get_future();
assert(alloc_stats.alloc_count == 2);
assert(f.valid());
f = p0.get_future();
assert(f.valid());
assert(alloc_stats.alloc_count == 2);
}
assert(alloc_stats.alloc_count == 0);
{
std::promise<int> p0(std::allocator_arg, test_allocator<int>(&alloc_stats));
std::promise<int> p;
assert(alloc_stats.alloc_count == 1);
p.swap(p0);
assert(alloc_stats.alloc_count == 1);
std::future<int> f = p.get_future();
assert(alloc_stats.alloc_count == 1);
assert(f.valid());
f = p0.get_future();
assert(f.valid());
assert(alloc_stats.alloc_count == 1);
}
assert(alloc_stats.alloc_count == 0);
{
std::promise<int> p0(std::allocator_arg, test_allocator<int>(&alloc_stats));
std::promise<int> p;
assert(alloc_stats.alloc_count == 1);
swap(p, p0);
assert(alloc_stats.alloc_count == 1);
std::future<int> f = p.get_future();
assert(alloc_stats.alloc_count == 1);
assert(f.valid());
f = p0.get_future();
assert(f.valid());
assert(alloc_stats.alloc_count == 1);
}
assert(alloc_stats.alloc_count == 0);
return 0;
}
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