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 // UNSUPPORTED: libcpp-has-no-threads 11 12 // <future> 13 14 // class promise<R> 15 16 // ~promise(); 17 18 #include <future> 19 #include <cassert> 20 21 int main() 22 { 23 { 24 typedef int T; 25 std::future<T> f; 26 { 27 std::promise<T> p; 28 f = p.get_future(); 29 p.set_value(3); 30 } 31 assert(f.get() == 3); 32 } 33 { 34 typedef int T; 35 std::future<T> f; 36 { 37 std::promise<T> p; 38 f = p.get_future(); 39 } 40 try 41 { 42 T i = f.get(); 43 assert(false); 44 } 45 catch (const std::future_error& e) 46 { 47 assert(e.code() == make_error_code(std::future_errc::broken_promise)); 48 } 49 } 50 51 { 52 typedef int& T; 53 int i = 4; 54 std::future<T> f; 55 { 56 std::promise<T> p; 57 f = p.get_future(); 58 p.set_value(i); 59 } 60 assert(&f.get() == &i); 61 } 62 { 63 typedef int& T; 64 std::future<T> f; 65 { 66 std::promise<T> p; 67 f = p.get_future(); 68 } 69 try 70 { 71 T i = f.get(); 72 assert(false); 73 } 74 catch (const std::future_error& e) 75 { 76 assert(e.code() == make_error_code(std::future_errc::broken_promise)); 77 } 78 } 79 80 { 81 typedef void T; 82 std::future<T> f; 83 { 84 std::promise<T> p; 85 f = p.get_future(); 86 p.set_value(); 87 } 88 f.get(); 89 assert(true); 90 } 91 { 92 typedef void T; 93 std::future<T> f; 94 { 95 std::promise<T> p; 96 f = p.get_future(); 97 } 98 try 99 { 100 f.get(); 101 assert(false); 102 } 103 catch (const std::future_error& e) 104 { 105 // LWG 2056 changed the values of future_errc, so if we're using new 106 // headers with an old library the error codes won't line up. 107 // 108 // Note that this particular check only applies to promise<void> 109 // since the other specializations happen to be implemented in the 110 // header rather than the library. 111 assert( 112 e.code() == make_error_code(std::future_errc::broken_promise) || 113 e.code() == std::error_code(0, std::future_category())); 114 } 115 } 116 } 117
