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 // void promise<R&>::set_value(R& r); 17 18 #include <future> 19 #include <cassert> 20 21 #include "test_macros.h" 22 main(int,char **)23int main(int, char**) 24 { 25 { 26 typedef int& T; 27 int i = 3; 28 std::promise<T> p; 29 std::future<T> f = p.get_future(); 30 p.set_value(i); 31 int& j = f.get(); 32 assert(j == 3); 33 ++i; 34 assert(j == 4); 35 #ifndef TEST_HAS_NO_EXCEPTIONS 36 try 37 { 38 p.set_value(i); 39 assert(false); 40 } 41 catch (const std::future_error& e) 42 { 43 assert(e.code() == make_error_code(std::future_errc::promise_already_satisfied)); 44 } 45 #endif 46 } 47 48 return 0; 49 } 50