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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// UNSUPPORTED: c++98, c++03
// <future>
// class promise<R>
// void promise<R&>::set_value(R& r);
#include <future>
#include <cassert>
int main()
{
{
typedef int& T;
int i = 3;
std::promise<T> p;
std::future<T> f = p.get_future();
p.set_value(i);
int& j = f.get();
assert(j == 3);
++i;
assert(j == 4);
try
{
p.set_value(i);
assert(false);
}
catch (const std::future_error& e)
{
assert(e.code() == make_error_code(std::future_errc::promise_already_satisfied));
}
}
}
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