libstdc++-v3/src/c++11/system_error.cc

   1 // <system_error> implementation file
   2
   3 // Copyright (C) 2007-2014 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
  26 #include <cstring>
  27 #include <system_error>
  28 #include <bits/functexcept.h>
  29 #include <limits>
  30
  31 namespace
  32 {
  33   using std::string;
  34
  35   struct generic_error_category : public std::error_category
  36   {
  37     virtual const char*
  38     name() const noexcept
  39     { return "generic"; }
  40
  41     virtual string
  42     message(int i) const
  43     {
  44       // XXX locale issues: how does one get or set loc.
  45       // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
  46       return string(strerror(i));
  47     }
  48   };
  49
  50   struct system_error_category : public std::error_category
  51   {
  52     virtual const char*
  53     name() const noexcept
  54     { return "system"; }
  55
  56     virtual string
  57     message(int i) const
  58     {
  59       // XXX locale issues: how does one get or set loc.
  60       // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
  61       return string(strerror(i));
  62     }
  63   };
  64
  65   const generic_error_category generic_category_instance{};
  66   const system_error_category system_category_instance{};
  67 }
  68
  69 namespace std _GLIBCXX_VISIBILITY(default)
  70 {
  71 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  72
  73   error_category::~error_category() noexcept = default;
  74
  75   const error_category&
  76   system_category() noexcept { return system_category_instance; }
  77
  78   const error_category&
  79   generic_category() noexcept { return generic_category_instance; }
  80
  81   system_error::~system_error() noexcept = default;
  82
  83   error_condition
  84   error_category::default_error_condition(int __i) const noexcept
  85   { return error_condition(__i, *this); }
  86
  87   bool
  88   error_category::equivalent(int __i,
  89                              const error_condition& __cond) const noexcept
  90   { return default_error_condition(__i) == __cond; }
  91
  92   bool
  93   error_category::equivalent(const error_code& __code, int __i) const noexcept
  94   { return *this == __code.category() && __code.value() == __i; }
  95
  96   error_condition
  97   error_code::default_error_condition() const noexcept
  98   { return category().default_error_condition(value()); }
  99
 100 _GLIBCXX_END_NAMESPACE_VERSION
 101 } // namespace