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 // UNSUPPORTED: c++98, c++03 12 13 // <future> 14 15 // class promise<R> 16 17 // ~promise(); 18 19 #include <future> 20 #include <cassert> 21 22 #include "test_macros.h" 23 24 int main() 25 { 26 { 27 typedef int T; 28 std::future<T> f; 29 { 30 std::promise<T> p; 31 f = p.get_future(); 32 p.set_value(3); 33 } 34 assert(f.get() == 3); 35 } 36 #ifndef TEST_HAS_NO_EXCEPTIONS 37 { 38 typedef int T; 39 std::future<T> f; 40 { 41 std::promise<T> p; 42 f = p.get_future(); 43 } 44 try 45 { 46 T i = f.get(); 47 ((void)i); // Prevent unused warning 48 assert(false); 49 } 50 catch (const std::future_error& e) 51 { 52 assert(e.code() == make_error_code(std::future_errc::broken_promise)); 53 } 54 } 55 #endif 56 57 { 58 typedef int& T; 59 int i = 4; 60 std::future<T> f; 61 { 62 std::promise<T> p; 63 f = p.get_future(); 64 p.set_value(i); 65 } 66 assert(&f.get() == &i); 67 } 68 #ifndef TEST_HAS_NO_EXCEPTIONS 69 { 70 typedef int& T; 71 std::future<T> f; 72 { 73 std::promise<T> p; 74 f = p.get_future(); 75 } 76 try 77 { 78 T i = f.get(); 79 ((void)i); // Prevent unused warning 80 assert(false); 81 } 82 catch (const std::future_error& e) 83 { 84 assert(e.code() == make_error_code(std::future_errc::broken_promise)); 85 } 86 } 87 #endif 88 89 { 90 typedef void T; 91 std::future<T> f; 92 { 93 std::promise<T> p; 94 f = p.get_future(); 95 p.set_value(); 96 } 97 f.get(); 98 assert(true); 99 } 100 #ifndef TEST_HAS_NO_EXCEPTIONS 101 { 102 typedef void T; 103 std::future<T> f; 104 { 105 std::promise<T> p; 106 f = p.get_future(); 107 } 108 try 109 { 110 f.get(); 111 assert(false); 112 } 113 catch (const std::future_error& e) 114 { 115 // LWG 2056 changed the values of future_errc, so if we're using new 116 // headers with an old library the error codes won't line up. 117 // 118 // Note that this particular check only applies to promise<void> 119 // since the other specializations happen to be implemented in the 120 // header rather than the library. 121 assert( 122 e.code() == make_error_code(std::future_errc::broken_promise) || 123 e.code() == std::error_code(0, std::future_category())); 124 } 125 } 126 #endif 127 } 128
