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 // void promise<R&>::set_value(R& r); 15 16 #include <future> 17 #include <cassert> 18 19 int main() 20 { 21 { 22 typedef int& T; 23 int i = 3; 24 std::promise<T> p; 25 std::future<T> f = p.get_future(); 26 p.set_value(i); 27 int& j = f.get(); 28 assert(j == 3); 29 ++i; 30 assert(j == 4); 31 try 32 { 33 p.set_value(i); 34 assert(false); 35 } 36 catch (const std::future_error& e) 37 { 38 assert(e.code() == make_error_code(std::future_errc::promise_already_satisfied)); 39 } 40 } 41 } 42
