text: // Methods for Exception Support for -*- C++ -*-
  
  // Copyright (C) 2014-2015 Free Software Foundation, Inc.
  //
  // This file is part of the GNU ISO C++ Library.  This library is free
  // software; you can redistribute it and/or modify it under the
  // terms of the GNU General Public License as published by the
  // Free Software Foundation; either version 3, or (at your option)
  // any later version.
  
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  
  // Under Section 7 of GPL version 3, you are granted additional
  // permissions described in the GCC Runtime Library Exception, version
  // 3.1, as published by the Free Software Foundation.
  
  // You should have received a copy of the GNU General Public License and
  // a copy of the GCC Runtime Library Exception along with this program;
  // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  // <http://www.gnu.org/licenses/>.
  
  //
  // ISO C++ 14882: 19.1  Exception classes
  //
  
  // All exception classes still use the classic COW std::string.
  #define _GLIBCXX_USE_CXX11_ABI 0
  #define _GLIBCXX_DEFINE_STDEXCEPT_COPY_OPS 1
  #define __cow_string __cow_stringxxx
  #include <stdexcept>
  #include <system_error>
  #undef __cow_string
  
  namespace std _GLIBCXX_VISIBILITY(default)
  {
  _GLIBCXX_BEGIN_NAMESPACE_VERSION
  
    // Copy constructors and assignment operators defined using COW std::string
  
    logic_error::logic_error(const logic_error& e) noexcept
    : _M_msg(e._M_msg) { }
  
    logic_error& logic_error::operator=(const logic_error& e) noexcept
    { _M_msg = e._M_msg; return *this; }
  
    runtime_error::runtime_error(const runtime_error& e) noexcept
    : _M_msg(e._M_msg) { }
  
    runtime_error&
    runtime_error::operator=(const runtime_error& e) noexcept
    { _M_msg = e._M_msg; return *this; }
  
    // New C++11 constructors:
  
    logic_error::logic_error(const char* __arg)
    : exception(), _M_msg(__arg) { }
  
    domain_error::domain_error(const char* __arg)
    : logic_error(__arg) { }
  
    invalid_argument::invalid_argument(const char* __arg)
    : logic_error(__arg) { }
  
    length_error::length_error(const char* __arg)
    : logic_error(__arg) { }
  
    out_of_range::out_of_range(const char* __arg)
    : logic_error(__arg) { }
  
    runtime_error::runtime_error(const char* __arg)
    : exception(), _M_msg(__arg) { }
  
    range_error::range_error(const char* __arg)
    : runtime_error(__arg) { }
  
    overflow_error::overflow_error(const char* __arg)
    : runtime_error(__arg) { }
  
    underflow_error::underflow_error(const char* __arg)
    : runtime_error(__arg) { }
  
  #if _GLIBCXX_USE_DUAL_ABI
    // Converting constructor from COW std::string to SSO string.
    __sso_string::__sso_string(const string& s)
    : __sso_string(s.c_str(), s.length()) { }
  
    // Redefine __cow_string so that we can define and export its members
    // in terms of the COW std::string.
    struct __cow_string
    {
      union {
        const char* _M_p;
        char _M_bytes[sizeof(_M_p)];
        std::string _M_str;
      };
  
      __cow_string();
      __cow_string(const std::string& s);
      __cow_string(const char*, size_t n);
      __cow_string(const __cow_string&) noexcept;
      __cow_string& operator=(const __cow_string&) noexcept;
      ~__cow_string();
      __cow_string(__cow_string&&) noexcept;
      __cow_string& operator=(__cow_string&&) noexcept;
    };
  
    __cow_string::__cow_string() : _M_str() { }
  
    __cow_string::__cow_string(const std::string& s) : _M_str(s) { }
  
    __cow_string::__cow_string(const char* s, size_t n) : _M_str(s, n) { }
  
    __cow_string::__cow_string(const __cow_string& s) noexcept
    : _M_str(s._M_str) { }
  
    __cow_string&
    __cow_string::operator=(const __cow_string& s) noexcept
    {
      _M_str = s._M_str;
      return *this;
    }
  
    __cow_string::~__cow_string() { _M_str.~basic_string(); }
  
    __cow_string::__cow_string(__cow_string&& s) noexcept
    : _M_str(std::move(s._M_str)) { }
  
    __cow_string&
    __cow_string::operator=(__cow_string&& s) noexcept
    {
      _M_str = std::move(s._M_str);
      return *this;
    }
  
    static_assert(sizeof(__cow_string) == sizeof(std::string),
                  "sizeof(std::string) has changed");
    static_assert(alignof(__cow_string) == alignof(std::string),
                  "alignof(std::string) has changed");
  #endif
  
    // Return error_category::message() as an SSO string
    __sso_string
    error_category::_M_message(int i) const
    {
      string msg = this->message(i);
      return {msg.c_str(), msg.length()};
    }
  
  _GLIBCXX_END_NAMESPACE_VERSION
  } // namespace
  