1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// UNSUPPORTED: no-threads
10// UNSUPPORTED: c++03
11
12// <future>
13
14// class promise<R>
15
16// future<R> get_future();
17
18#include <future>
19#include <cassert>
20
21#include "test_macros.h"
22
23int main(int, char**)
24{
25 {
26 std::promise<double> p;
27 std::future<double> f = p.get_future();
28 p.set_value(105.5);
29 assert(f.get() == 105.5);
30 }
31#ifndef TEST_HAS_NO_EXCEPTIONS
32 {
33 std::promise<double> p;
34 std::future<double> f = p.get_future();
35 try
36 {
37 f = p.get_future();
38 assert(false);
39 }
40 catch (const std::future_error& e)
41 {
42 assert(e.code() == make_error_code(std::future_errc::future_already_retrieved));
43 }
44 }
45 {
46 std::promise<double> p;
47 std::promise<double> p0 = std::move(p);
48 try
49 {
50 std::future<double> f = p.get_future();
51 assert(false);
52 }
53 catch (const std::future_error& e)
54 {
55 assert(e.code() == make_error_code(std::future_errc::no_state));
56 }
57 }
58#endif
59
60 return 0;
61}
62

source code of libcxx/test/std/thread/futures/futures.promise/get_future.pass.cpp