1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <future> 11 12 // class promise<R> 13 14 // future<R> get_future(); 15 16 #include <future> 17 #include <cassert> 18 main()19int main() 20 { 21 { 22 std::promise<double> p; 23 std::future<double> f = p.get_future(); 24 p.set_value(105.5); 25 assert(f.get() == 105.5); 26 } 27 { 28 std::promise<double> p; 29 std::future<double> f = p.get_future(); 30 try 31 { 32 f = p.get_future(); 33 assert(false); 34 } 35 catch (const std::future_error& e) 36 { 37 assert(e.code() == make_error_code(std::future_errc::future_already_retrieved)); 38 } 39 } 40 { 41 std::promise<double> p; 42 std::promise<double> p0 = std::move(p); 43 try 44 { 45 std::future<double> f = p.get_future(); 46 assert(false); 47 } 48 catch (const std::future_error& e) 49 { 50 assert(e.code() == make_error_code(std::future_errc::no_state)); 51 } 52 } 53 } 54