libstdc++-v3/src/c++11/cow-stdexcept.cc

   1 // Methods for Exception Support for -*- C++ -*-
   2
   3 // Copyright (C) 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 // ISO C++ 14882: 19.1  Exception classes
  27 //
  28
  29 // All exception classes still use the classic COW std::string.
  30 #define _GLIBCXX_USE_CXX11_ABI 0
  31 #define _GLIBCXX_DEFINE_STDEXCEPT_COPY_OPS 1
  32 #define __cow_string __cow_stringxxx
  33 #include <stdexcept>
  34 #include <system_error>
  35 #undef __cow_string
  36
  37 namespace std _GLIBCXX_VISIBILITY(default)
  38 {
  39 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  40
  41   // Copy constructors and assignment operators defined using COW std::string
  42
  43   logic_error::logic_error(const logic_error& e) noexcept
  44   : _M_msg(e._M_msg) { }
  45
  46   logic_error& logic_error::operator=(const logic_error& e) noexcept
  47   { _M_msg = e._M_msg; return *this; }
  48
  49   runtime_error::runtime_error(const runtime_error& e) noexcept
  50   : _M_msg(e._M_msg) { }
  51
  52   runtime_error&
  53   runtime_error::operator=(const runtime_error& e) noexcept
  54   { _M_msg = e._M_msg; return *this; }
  55
  56   // New C++11 constructors:
  57
  58   logic_error::logic_error(const char* __arg)
  59   : exception(), _M_msg(__arg) { }
  60
  61   domain_error::domain_error(const char* __arg)
  62   : logic_error(__arg) { }
  63
  64   invalid_argument::invalid_argument(const char* __arg)
  65   : logic_error(__arg) { }
  66
  67   length_error::length_error(const char* __arg)
  68   : logic_error(__arg) { }
  69
  70   out_of_range::out_of_range(const char* __arg)
  71   : logic_error(__arg) { }
  72
  73   runtime_error::runtime_error(const char* __arg)
  74   : exception(), _M_msg(__arg) { }
  75
  76   range_error::range_error(const char* __arg)
  77   : runtime_error(__arg) { }
  78
  79   overflow_error::overflow_error(const char* __arg)
  80   : runtime_error(__arg) { }
  81
  82   underflow_error::underflow_error(const char* __arg)
  83   : runtime_error(__arg) { }
  84
  85 #if _GLIBCXX_USE_DUAL_ABI
  86   // Converting constructor from COW std::string to SSO string.
  87   __sso_string::__sso_string(const string& s)
  88   : __sso_string(s.c_str(), s.length()) { }
  89
  90   // Redefine __cow_string so that we can define and export its members
  91   // in terms of the COW std::string.
  92   struct __cow_string
  93   {
  94     union {
  95       const char* _M_p;
  96       char _M_bytes[sizeof(_M_p)];
  97       std::string _M_str;
  98     };
  99
 100     __cow_string();
 101     __cow_string(const std::string& s);
 102     __cow_string(const char*, size_t n);
 103     __cow_string(const __cow_string&) noexcept;
 104     __cow_string& operator=(const __cow_string&) noexcept;
 105     ~__cow_string();
 106     __cow_string(__cow_string&&) noexcept;
 107     __cow_string& operator=(__cow_string&&) noexcept;
 108   };
 109
 110   __cow_string::__cow_string() : _M_str() { }
 111
 112   __cow_string::__cow_string(const std::string& s) : _M_str(s) { }
 113
 114   __cow_string::__cow_string(const char* s, size_t n) : _M_str(s, n) { }
 115
 116   __cow_string::__cow_string(const __cow_string& s) noexcept
 117   : _M_str(s._M_str) { }
 118
 119   __cow_string&
 120   __cow_string::operator=(const __cow_string& s) noexcept
 121   {
 122     _M_str = s._M_str;
 123     return *this;
 124   }
 125
 126   __cow_string::~__cow_string() { _M_str.~basic_string(); }
 127
 128   __cow_string::__cow_string(__cow_string&& s) noexcept
 129   : _M_str(std::move(s._M_str)) { }
 130
 131   __cow_string&
 132   __cow_string::operator=(__cow_string&& s) noexcept
 133   {
 134     _M_str = std::move(s._M_str);
 135     return *this;
 136   }
 137
 138   static_assert(sizeof(__cow_string) == sizeof(std::string),
 139                 "sizeof(std::string) has changed");
 140   static_assert(alignof(__cow_string) == alignof(std::string),
 141                 "alignof(std::string) has changed");
 142 #endif
 143
 144   // Return error_category::message() as an SSO string
 145   __sso_string
 146   error_category::_M_message(int i) const
 147   {
 148     string msg = this->message(i);
 149     return {msg.c_str(), msg.length()};
 150   }
 151
 152 _GLIBCXX_END_NAMESPACE_VERSION
 153 } // namespace