libstdc++-v3/src/future.cc

   1 // future -*- C++ -*-
   2
   3 // Copyright (C) 2009, 2010 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     future_error_category() {}
  32
  33     virtual const char*
  34     name() const
  35     { return "future"; }
  36
  37     virtual std::string message(int __ec) const
  38     {
  39       std::string __msg;
  40       switch (std::future_errc(__ec))
  41       {
  42       case std::future_errc::broken_promise:
  43           __msg = "Broken promise";
  44           break;
  45       case std::future_errc::future_already_retrieved:
  46           __msg = "Future already retrieved";
  47           break;
  48       case std::future_errc::promise_already_satisfied:
  49           __msg = "Promise already satisfied";
  50           break;
  51       default:
  52           __msg = "Unknown error";
  53           break;
  54       }
  55       return __msg;
  56     }
  57   };
  58
  59   const future_error_category&
  60   __future_category_instance()
  61   {
  62     static const future_error_category __fec;
  63     return __fec;
  64   }
  65 }
  66
  67 _GLIBCXX_BEGIN_NAMESPACE(std)
  68
  69   const error_category& future_category()
  70   { return __future_category_instance(); }
  71
  72   future_error::~future_error() throw() { }
  73
  74   const char*
  75   future_error::what() const throw() { return _M_code.message().c_str(); }
  76
  77 _GLIBCXX_END_NAMESPACE
  78
  79 // XXX GLIBCXX_ABI Deprecated
  80 // gcc-4.6.0
  81 // <future> export changes
  82 #if defined(_GLIBCXX_SYMVER_GNU) && defined(PIC) \
  83     && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \
  84     && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT)
  85
  86 namespace __gnu_cxx
  87 {
  88   const std::error_category* future_category = &__future_category_instance();
  89 }
  90
  91 #define _GLIBCXX_ASM_SYMVER(cur, old, version) \
  92    asm (".symver " #cur "," #old "@@@" #version);
  93
  94 _GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx15future_categoryE, _ZSt15future_category, GLIBCXX_3.4.14)
  95
  96 #endif
  97