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 main(int,char **)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