1 // future -*- C++ -*- 2 3 // Copyright (C) 2009, 2010, 2011, 2012 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 #include <future> 26 27 namespace 28 { 29 struct future_error_category : public std::error_category 30 { 31 virtual const char* 32 name() const noexcept 33 { return "future"; } 34 35 virtual std::string message(int __ec) const 36 { 37 std::string __msg; 38 switch (std::future_errc(__ec)) 39 { 40 case std::future_errc::broken_promise: 41 __msg = "Broken promise"; 42 break; 43 case std::future_errc::future_already_retrieved: 44 __msg = "Future already retrieved"; 45 break; 46 case std::future_errc::promise_already_satisfied: 47 __msg = "Promise already satisfied"; 48 break; 49 case std::future_errc::no_state: 50 __msg = "No associated state"; 51 break; 52 default: 53 __msg = "Unknown error"; 54 break; 55 } 56 return __msg; 57 } 58 }; 59 60 const future_error_category& 61 __future_category_instance() noexcept 62 { 63 static const future_error_category __fec{}; 64 return __fec; 65 } 66 } 67 68 namespace std _GLIBCXX_VISIBILITY(default) 69 { 70 _GLIBCXX_BEGIN_NAMESPACE_VERSION 71 72 const error_category& future_category() noexcept 73 { return __future_category_instance(); } 74 75 future_error::~future_error() noexcept { } 76 77 const char* 78 future_error::what() const noexcept { return _M_code.message().c_str(); } 79 80 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) \ 81 && (ATOMIC_INT_LOCK_FREE > 1) 82 __future_base::_Result_base::_Result_base() = default; 83 84 __future_base::_Result_base::~_Result_base() = default; 85 86 __future_base::_State_base::~_State_base() = default; 87 #endif 88 89 _GLIBCXX_END_NAMESPACE_VERSION 90 } // namespace std 91