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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.
//
//===----------------------------------------------------------------------===//
// <future>
// class promise<R>
// future<R> get_future();
#include <future>
#include <cassert>
int main()
{
{
std::promise<double> p;
std::future<double> f = p.get_future();
p.set_value(105.5);
assert(f.get() == 105.5);
}
{
std::promise<double> p;
std::future<double> f = p.get_future();
try
{
f = p.get_future();
assert(false);
}
catch (const std::future_error& e)
{
assert(e.code() == make_error_code(std::future_errc::future_already_retrieved));
}
}
{
std::promise<double> p;
std::promise<double> p0 = std::move(p);
try
{
std::future<double> f = p.get_future();
assert(false);
}
catch (const std::future_error& e)
{
assert(e.code() == make_error_code(std::future_errc::no_state));
}
}
}
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