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Edit File : codecvt.h \| Size : 20.79 KB
// Locale support (codecvt) -- C++ -- // Copyright (C) 2000-2018 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/>. /** @file bits/codecvt.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{locale} / // // ISO C++ 14882: 22.2.1.5 Template class codecvt // // Written by Benjamin Kosnik <bkoz@redhat.com> #ifndef _CODECVT_H #define _CODECVT_H 1 #pragma GCC system_header namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /// Empty base class for codecvt facet [22.2.1.5]. class codecvt_base { public: enum result { ok, partial, error, noconv }; }; /* * @brief Common base for codecvt functions. * * This template class provides implementations of the public functions * that forward to the protected virtual functions. * * This template also provides abstract stubs for the protected virtual * functions. / template<typename _InternT, typename _ExternT, typename _StateT> class __codecvt_abstract_base : public locale::facet, public codecvt_base { public: // Types: typedef codecvt_base::result result; typedef _InternT intern_type; typedef _ExternT extern_type; typedef _StateT state_type; // 22.2.1.5.1 codecvt members /* * @brief Convert from internal to external character set. * * Converts input string of intern_type to output string of * extern_type. This is analogous to wcsrtombs. It does this by * calling codecvt::do_out. * * The source and destination character sets are determined by the * facet's locale, internal and external types. * * The characters in [from,from_end) are converted and written to * [to,to_end). from_next and to_next are set to point to the * character following the last successfully converted character, * respectively. If the result needed no conversion, from_next and * to_next are not affected. * * The @a state argument should be initialized if the input is at the * beginning and carried from a previous call if continuing * conversion. There are no guarantees about how @a state is used. * * The result returned is a member of codecvt_base::result. If * all the input is converted, returns codecvt_base::ok. If no * conversion is necessary, returns codecvt_base::noconv. If * the input ends early or there is insufficient space in the * output, returns codecvt_base::partial. Otherwise the * conversion failed and codecvt_base::error is returned. * * @param __state Persistent conversion state data. * @param __from Start of input. * @param __from_end End of input. * @param __from_next Returns start of unconverted data. * @param __to Start of output buffer. * @param __to_end End of output buffer. * @param __to_next Returns start of unused output area. * @return codecvt_base::result. / result out(state_type& __state, const intern_type __from, const intern_type* __from_end, const intern_type& __from_next, extern_type __to, extern_type* __to_end, extern_type& __to_next) const { return this->do_out(__state, __from, __from_end, __from_next, __to, __to_end, __to_next); } /* * @brief Reset conversion state. * * Writes characters to output that would restore @a state to initial * conditions. The idea is that if a partial conversion occurs, then * the converting the characters written by this function would leave * the state in initial conditions, rather than partial conversion * state. It does this by calling codecvt::do_unshift(). * * For example, if 4 external characters always converted to 1 internal * character, and input to in() had 6 external characters with state * saved, this function would write two characters to the output and * set the state to initialized conditions. * * The source and destination character sets are determined by the * facet's locale, internal and external types. * * The result returned is a member of codecvt_base::result. If the * state could be reset and data written, returns codecvt_base::ok. If * no conversion is necessary, returns codecvt_base::noconv. If the * output has insufficient space, returns codecvt_base::partial. * Otherwise the reset failed and codecvt_base::error is returned. * * @param __state Persistent conversion state data. * @param __to Start of output buffer. * @param __to_end End of output buffer. * @param __to_next Returns start of unused output area. * @return codecvt_base::result. / result unshift(state_type& __state, extern_type __to, extern_type* __to_end, extern_type& __to_next) const { return this->do_unshift(__state, __to,__to_end,__to_next); } /* * @brief Convert from external to internal character set. * * Converts input string of extern_type to output string of * intern_type. This is analogous to mbsrtowcs. It does this by * calling codecvt::do_in. * * The source and destination character sets are determined by the * facet's locale, internal and external types. * * The characters in [from,from_end) are converted and written to * [to,to_end). from_next and to_next are set to point to the * character following the last successfully converted character, * respectively. If the result needed no conversion, from_next and * to_next are not affected. * * The @a state argument should be initialized if the input is at the * beginning and carried from a previous call if continuing * conversion. There are no guarantees about how @a state is used. * * The result returned is a member of codecvt_base::result. If * all the input is converted, returns codecvt_base::ok. If no * conversion is necessary, returns codecvt_base::noconv. If * the input ends early or there is insufficient space in the * output, returns codecvt_base::partial. Otherwise the * conversion failed and codecvt_base::error is returned. * * @param __state Persistent conversion state data. * @param __from Start of input. * @param __from_end End of input. * @param __from_next Returns start of unconverted data. * @param __to Start of output buffer. * @param __to_end End of output buffer. * @param __to_next Returns start of unused output area. * @return codecvt_base::result. / result in(state_type& __state, const extern_type __from, const extern_type* __from_end, const extern_type& __from_next, intern_type __to, intern_type* __to_end, intern_type& __to_next) const { return this->do_in(__state, __from, __from_end, __from_next, __to, __to_end, __to_next); } int encoding() const throw() { return this->do_encoding(); } bool always_noconv() const throw() { return this->do_always_noconv(); } int length(state_type& __state, const extern_type __from, const extern_type* __end, size_t __max) const { return this->do_length(__state, __from, __end, __max); } int max_length() const throw() { return this->do_max_length(); } protected: explicit __codecvt_abstract_base(size_t __refs = 0) : locale::facet(__refs) { } virtual ~__codecvt_abstract_base() { } /** * @brief Convert from internal to external character set. * * Converts input string of intern_type to output string of * extern_type. This function is a hook for derived classes to change * the value returned. @see out for more information. / virtual result do_out(state_type& __state, const intern_type __from, const intern_type* __from_end, const intern_type& __from_next, extern_type __to, extern_type* __to_end, extern_type& __to_next) const = 0; virtual result do_unshift(state_type& __state, extern_type __to, extern_type* __to_end, extern_type& __to_next) const = 0; virtual result do_in(state_type& __state, const extern_type __from, const extern_type* __from_end, const extern_type& __from_next, intern_type __to, intern_type* __to_end, intern_type& __to_next) const = 0; virtual int do_encoding() const throw() = 0; virtual bool do_always_noconv() const throw() = 0; virtual int do_length(state_type&, const extern_type __from, const extern_type* __end, size_t __max) const = 0; virtual int do_max_length() const throw() = 0; }; /** * @brief Primary class template codecvt. * @ingroup locales * * NB: Generic, mostly useless implementation. * / template<typename _InternT, typename _ExternT, typename _StateT> class codecvt : public __codecvt_abstract_base<_InternT, _ExternT, _StateT> { public: // Types: typedef codecvt_base::result result; typedef _InternT intern_type; typedef _ExternT extern_type; typedef _StateT state_type; protected: __c_locale _M_c_locale_codecvt; public: static locale::id id; explicit codecvt(size_t __refs = 0) : __codecvt_abstract_base<_InternT, _ExternT, _StateT> (__refs), _M_c_locale_codecvt(0) { } explicit codecvt(__c_locale __cloc, size_t __refs = 0); protected: virtual ~codecvt() { } virtual result do_out(state_type& __state, const intern_type __from, const intern_type* __from_end, const intern_type& __from_next, extern_type __to, extern_type* __to_end, extern_type& __to_next) const; virtual result do_unshift(state_type& __state, extern_type __to, extern_type* __to_end, extern_type& __to_next) const; virtual result do_in(state_type& __state, const extern_type __from, const extern_type* __from_end, const extern_type& __from_next, intern_type __to, intern_type* __to_end, intern_type& __to_next) const; virtual int do_encoding() const throw(); virtual bool do_always_noconv() const throw(); virtual int do_length(state_type&, const extern_type __from, const extern_type* __end, size_t __max) const; virtual int do_max_length() const throw(); }; template<typename _InternT, typename _ExternT, typename _StateT> locale::id codecvt<_InternT, _ExternT, _StateT>::id; /// class codecvt<char, char, mbstate_t> specialization. template<> class codecvt<char, char, mbstate_t> : public __codecvt_abstract_base<char, char, mbstate_t> { friend class messages<char>; public: // Types: typedef char intern_type; typedef char extern_type; typedef mbstate_t state_type; protected: __c_locale _M_c_locale_codecvt; public: static locale::id id; explicit codecvt(size_t __refs = 0); explicit codecvt(__c_locale __cloc, size_t __refs = 0); protected: virtual ~codecvt(); virtual result do_out(state_type& __state, const intern_type* __from, const intern_type* __from_end, const intern_type& __from_next, extern_type __to, extern_type* __to_end, extern_type& __to_next) const; virtual result do_unshift(state_type& __state, extern_type __to, extern_type* __to_end, extern_type& __to_next) const; virtual result do_in(state_type& __state, const extern_type __from, const extern_type* __from_end, const extern_type& __from_next, intern_type __to, intern_type* __to_end, intern_type& __to_next) const; virtual int do_encoding() const throw(); virtual bool do_always_noconv() const throw(); virtual int do_length(state_type&, const extern_type __from, const extern_type* __end, size_t __max) const; virtual int do_max_length() const throw(); }; #ifdef _GLIBCXX_USE_WCHAR_T /** @brief Class codecvt<wchar_t, char, mbstate_t> specialization. * * Converts between narrow and wide characters in the native character set / template<> class codecvt<wchar_t, char, mbstate_t> : public __codecvt_abstract_base<wchar_t, char, mbstate_t> { friend class messages<wchar_t>; public: // Types: typedef wchar_t intern_type; typedef char extern_type; typedef mbstate_t state_type; protected: __c_locale _M_c_locale_codecvt; public: static locale::id id; explicit codecvt(size_t __refs = 0); explicit codecvt(__c_locale __cloc, size_t __refs = 0); protected: virtual ~codecvt(); virtual result do_out(state_type& __state, const intern_type __from, const intern_type* __from_end, const intern_type& __from_next, extern_type __to, extern_type* __to_end, extern_type& __to_next) const; virtual result do_unshift(state_type& __state, extern_type __to, extern_type* __to_end, extern_type& __to_next) const; virtual result do_in(state_type& __state, const extern_type __from, const extern_type* __from_end, const extern_type& __from_next, intern_type __to, intern_type* __to_end, intern_type& __to_next) const; virtual int do_encoding() const throw(); virtual bool do_always_noconv() const throw(); virtual int do_length(state_type&, const extern_type __from, const extern_type* __end, size_t __max) const; virtual int do_max_length() const throw(); }; #endif //_GLIBCXX_USE_WCHAR_T #if __cplusplus >= 201103L #ifdef _GLIBCXX_USE_C99_STDINT_TR1 /** @brief Class codecvt<char16_t, char, mbstate_t> specialization. * * Converts between UTF-16 and UTF-8. / template<> class codecvt<char16_t, char, mbstate_t> : public __codecvt_abstract_base<char16_t, char, mbstate_t> { public: // Types: typedef char16_t intern_type; typedef char extern_type; typedef mbstate_t state_type; public: static locale::id id; explicit codecvt(size_t __refs = 0) : __codecvt_abstract_base<char16_t, char, mbstate_t>(__refs) { } protected: virtual ~codecvt(); virtual result do_out(state_type& __state, const intern_type __from, const intern_type* __from_end, const intern_type& __from_next, extern_type __to, extern_type* __to_end, extern_type& __to_next) const; virtual result do_unshift(state_type& __state, extern_type __to, extern_type* __to_end, extern_type& __to_next) const; virtual result do_in(state_type& __state, const extern_type __from, const extern_type* __from_end, const extern_type& __from_next, intern_type __to, intern_type* __to_end, intern_type& __to_next) const; virtual int do_encoding() const throw(); virtual bool do_always_noconv() const throw(); virtual int do_length(state_type&, const extern_type __from, const extern_type* __end, size_t __max) const; virtual int do_max_length() const throw(); }; /** @brief Class codecvt<char32_t, char, mbstate_t> specialization. * * Converts between UTF-32 and UTF-8. / template<> class codecvt<char32_t, char, mbstate_t> : public __codecvt_abstract_base<char32_t, char, mbstate_t> { public: // Types: typedef char32_t intern_type; typedef char extern_type; typedef mbstate_t state_type; public: static locale::id id; explicit codecvt(size_t __refs = 0) : __codecvt_abstract_base<char32_t, char, mbstate_t>(__refs) { } protected: virtual ~codecvt(); virtual result do_out(state_type& __state, const intern_type __from, const intern_type* __from_end, const intern_type& __from_next, extern_type __to, extern_type* __to_end, extern_type& __to_next) const; virtual result do_unshift(state_type& __state, extern_type __to, extern_type* __to_end, extern_type& __to_next) const; virtual result do_in(state_type& __state, const extern_type __from, const extern_type* __from_end, const extern_type& __from_next, intern_type __to, intern_type* __to_end, intern_type& __to_next) const; virtual int do_encoding() const throw(); virtual bool do_always_noconv() const throw(); virtual int do_length(state_type&, const extern_type __from, const extern_type* __end, size_t __max) const; virtual int do_max_length() const throw(); }; #endif // _GLIBCXX_USE_C99_STDINT_TR1 #endif // C++11 /// class codecvt_byname [22.2.1.6]. template<typename _InternT, typename _ExternT, typename _StateT> class codecvt_byname : public codecvt<_InternT, _ExternT, _StateT> { public: explicit codecvt_byname(const char* __s, size_t __refs = 0) : codecvt<_InternT, _ExternT, _StateT>(__refs) { if (__builtin_strcmp(__s, "C") != 0 && __builtin_strcmp(__s, "POSIX") != 0) { this->_S_destroy_c_locale(this->_M_c_locale_codecvt); this->_S_create_c_locale(this->_M_c_locale_codecvt, __s); } } #if __cplusplus >= 201103L explicit codecvt_byname(const string& __s, size_t __refs = 0) : codecvt_byname(__s.c_str(), __refs) { } #endif protected: virtual ~codecvt_byname() { } }; #if __cplusplus >= 201103L && defined(_GLIBCXX_USE_C99_STDINT_TR1) template<> class codecvt_byname<char16_t, char, mbstate_t> : public codecvt<char16_t, char, mbstate_t> { public: explicit codecvt_byname(const char, size_t __refs = 0) : codecvt<char16_t, char, mbstate_t>(__refs) { } explicit codecvt_byname(const string& __s, size_t __refs = 0) : codecvt_byname(__s.c_str(), __refs) { } protected: virtual ~codecvt_byname() { } }; template<> class codecvt_byname<char32_t, char, mbstate_t> : public codecvt<char32_t, char, mbstate_t> { public: explicit codecvt_byname(const char, size_t __refs = 0) : codecvt<char32_t, char, mbstate_t>(__refs) { } explicit codecvt_byname(const string& __s, size_t __refs = 0) : codecvt_byname(__s.c_str(), __refs) { } protected: virtual ~codecvt_byname() { } }; #endif // Inhibit implicit instantiations for required instantiations, // which are defined via explicit instantiations elsewhere. #if _GLIBCXX_EXTERN_TEMPLATE extern template class codecvt_byname<char, char, mbstate_t>; extern template const codecvt<char, char, mbstate_t>& use_facet<codecvt<char, char, mbstate_t> >(const locale&); extern template bool has_facet<codecvt<char, char, mbstate_t> >(const locale&); #ifdef _GLIBCXX_USE_WCHAR_T extern template class codecvt_byname<wchar_t, char, mbstate_t>; extern template const codecvt<wchar_t, char, mbstate_t>& use_facet<codecvt<wchar_t, char, mbstate_t> >(const locale&); extern template bool has_facet<codecvt<wchar_t, char, mbstate_t> >(const locale&); #endif #if __cplusplus >= 201103L && defined(_GLIBCXX_USE_C99_STDINT_TR1) extern template class codecvt_byname<char16_t, char, mbstate_t>; extern template class codecvt_byname<char32_t, char, mbstate_t>; #endif #endif _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // _CODECVT_H Back

Edit File : codecvt.h | Size : 20.79 KB

// Locale support (codecvt) -*- C++ -*-

// Copyright (C) 2000-2018 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/>.

/** @file bits/codecvt.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{locale}
 */

//
// ISO C++ 14882: 22.2.1.5 Template class codecvt
//

// Written by Benjamin Kosnik <bkoz@redhat.com>

#ifndef _CODECVT_H
#define _CODECVT_H 1

#pragma GCC system_header

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/// Empty base class for codecvt facet [22.2.1.5].
  class codecvt_base
  {
  public:
    enum result
    {
      ok,
      partial,
      error,
      noconv
    };
  };

/**
   *  @brief  Common base for codecvt functions.
   *
   *  This template class provides implementations of the public functions
   *  that forward to the protected virtual functions.
   *
   *  This template also provides abstract stubs for the protected virtual
   *  functions.
  */
  template<typename _InternT, typename _ExternT, typename _StateT>
    class __codecvt_abstract_base
    : public locale::facet, public codecvt_base
    {
    public:
      // Types:
      typedef codecvt_base::result	result;
      typedef _InternT			intern_type;
      typedef _ExternT			extern_type;
      typedef _StateT			state_type;

// 22.2.1.5.1 codecvt members
      /**
       *  @brief  Convert from internal to external character set.
       *
       *  Converts input string of intern_type to output string of
       *  extern_type.  This is analogous to wcsrtombs.  It does this by
       *  calling codecvt::do_out.
       *
       *  The source and destination character sets are determined by the
       *  facet's locale, internal and external types.
       *
       *  The characters in [from,from_end) are converted and written to
       *  [to,to_end).  from_next and to_next are set to point to the
       *  character following the last successfully converted character,
       *  respectively.  If the result needed no conversion, from_next and
       *  to_next are not affected.
       *
       *  The @a state argument should be initialized if the input is at the
       *  beginning and carried from a previous call if continuing
       *  conversion.  There are no guarantees about how @a state is used.
       *
       *  The result returned is a member of codecvt_base::result.  If
       *  all the input is converted, returns codecvt_base::ok.  If no
       *  conversion is necessary, returns codecvt_base::noconv.  If
       *  the input ends early or there is insufficient space in the
       *  output, returns codecvt_base::partial.  Otherwise the
       *  conversion failed and codecvt_base::error is returned.
       *
       *  @param  __state  Persistent conversion state data.
       *  @param  __from  Start of input.
       *  @param  __from_end  End of input.
       *  @param  __from_next  Returns start of unconverted data.
       *  @param  __to  Start of output buffer.
       *  @param  __to_end  End of output buffer.
       *  @param  __to_next  Returns start of unused output area.
       *  @return  codecvt_base::result.
      */
      result
      out(state_type& __state, const intern_type* __from,
	  const intern_type* __from_end, const intern_type*& __from_next,
	  extern_type* __to, extern_type* __to_end,
	  extern_type*& __to_next) const
      {
	return this->do_out(__state, __from, __from_end, __from_next,
			    __to, __to_end, __to_next);
      }

/**
       *  @brief  Reset conversion state.
       *
       *  Writes characters to output that would restore @a state to initial
       *  conditions.  The idea is that if a partial conversion occurs, then
       *  the converting the characters written by this function would leave
       *  the state in initial conditions, rather than partial conversion
       *  state.  It does this by calling codecvt::do_unshift().
       *
       *  For example, if 4 external characters always converted to 1 internal
       *  character, and input to in() had 6 external characters with state
       *  saved, this function would write two characters to the output and
       *  set the state to initialized conditions.
       *
       *  The source and destination character sets are determined by the
       *  facet's locale, internal and external types.
       *
       *  The result returned is a member of codecvt_base::result.  If the
       *  state could be reset and data written, returns codecvt_base::ok.  If
       *  no conversion is necessary, returns codecvt_base::noconv.  If the
       *  output has insufficient space, returns codecvt_base::partial.
       *  Otherwise the reset failed and codecvt_base::error is returned.
       *
       *  @param  __state  Persistent conversion state data.
       *  @param  __to  Start of output buffer.
       *  @param  __to_end  End of output buffer.
       *  @param  __to_next  Returns start of unused output area.
       *  @return  codecvt_base::result.
      */
      result
      unshift(state_type& __state, extern_type* __to, extern_type* __to_end,
	      extern_type*& __to_next) const
      { return this->do_unshift(__state, __to,__to_end,__to_next); }

/**
       *  @brief  Convert from external to internal character set.
       *
       *  Converts input string of extern_type to output string of
       *  intern_type.  This is analogous to mbsrtowcs.  It does this by
       *  calling codecvt::do_in.
       *
       *  The source and destination character sets are determined by the
       *  facet's locale, internal and external types.
       *
       *  The characters in [from,from_end) are converted and written to
       *  [to,to_end).  from_next and to_next are set to point to the
       *  character following the last successfully converted character,
       *  respectively.  If the result needed no conversion, from_next and
       *  to_next are not affected.
       *
       *  The @a state argument should be initialized if the input is at the
       *  beginning and carried from a previous call if continuing
       *  conversion.  There are no guarantees about how @a state is used.
       *
       *  The result returned is a member of codecvt_base::result.  If
       *  all the input is converted, returns codecvt_base::ok.  If no
       *  conversion is necessary, returns codecvt_base::noconv.  If
       *  the input ends early or there is insufficient space in the
       *  output, returns codecvt_base::partial.  Otherwise the
       *  conversion failed and codecvt_base::error is returned.
       *
       *  @param  __state  Persistent conversion state data.
       *  @param  __from  Start of input.
       *  @param  __from_end  End of input.
       *  @param  __from_next  Returns start of unconverted data.
       *  @param  __to  Start of output buffer.
       *  @param  __to_end  End of output buffer.
       *  @param  __to_next  Returns start of unused output area.
       *  @return  codecvt_base::result.
      */
      result
      in(state_type& __state, const extern_type* __from,
	 const extern_type* __from_end, const extern_type*& __from_next,
	 intern_type* __to, intern_type* __to_end,
	 intern_type*& __to_next) const
      {
	return this->do_in(__state, __from, __from_end, __from_next,
			   __to, __to_end, __to_next);
      }

int
      encoding() const throw()
      { return this->do_encoding(); }

bool
      always_noconv() const throw()
      { return this->do_always_noconv(); }

int
      length(state_type& __state, const extern_type* __from,
	     const extern_type* __end, size_t __max) const
      { return this->do_length(__state, __from, __end, __max); }

int
      max_length() const throw()
      { return this->do_max_length(); }

protected:
      explicit
      __codecvt_abstract_base(size_t __refs = 0) : locale::facet(__refs) { }

virtual
      ~__codecvt_abstract_base() { }

/**
       *  @brief  Convert from internal to external character set.
       *
       *  Converts input string of intern_type to output string of
       *  extern_type.  This function is a hook for derived classes to change
       *  the value returned.  @see out for more information.
      */
      virtual result
      do_out(state_type& __state, const intern_type* __from,
	     const intern_type* __from_end, const intern_type*& __from_next,
	     extern_type* __to, extern_type* __to_end,
	     extern_type*& __to_next) const = 0;

virtual result
      do_unshift(state_type& __state, extern_type* __to,
		 extern_type* __to_end, extern_type*& __to_next) const = 0;

virtual result
      do_in(state_type& __state, const extern_type* __from,
	    const extern_type* __from_end, const extern_type*& __from_next,
	    intern_type* __to, intern_type* __to_end,
	    intern_type*& __to_next) const = 0;

virtual int
      do_encoding() const throw() = 0;

virtual bool
      do_always_noconv() const throw() = 0;

virtual int
      do_length(state_type&, const extern_type* __from,
		const extern_type* __end, size_t __max) const = 0;

virtual int
      do_max_length() const throw() = 0;
    };

/**
   *  @brief  Primary class template codecvt.
   *  @ingroup locales
   *
   *  NB: Generic, mostly useless implementation.
   *
  */
   template<typename _InternT, typename _ExternT, typename _StateT>
    class codecvt
    : public __codecvt_abstract_base<_InternT, _ExternT, _StateT>
    {
    public:
      // Types:
      typedef codecvt_base::result	result;
      typedef _InternT			intern_type;
      typedef _ExternT			extern_type;
      typedef _StateT			state_type;

protected:
      __c_locale			_M_c_locale_codecvt;

public:
      static locale::id			id;

explicit
      codecvt(size_t __refs = 0)
      : __codecvt_abstract_base<_InternT, _ExternT, _StateT> (__refs),
	_M_c_locale_codecvt(0)
      { }

explicit
      codecvt(__c_locale __cloc, size_t __refs = 0);

protected:
      virtual
      ~codecvt() { }

virtual result
      do_out(state_type& __state, const intern_type* __from,
	     const intern_type* __from_end, const intern_type*& __from_next,
	     extern_type* __to, extern_type* __to_end,
	     extern_type*& __to_next) const;

virtual result
      do_unshift(state_type& __state, extern_type* __to,
		 extern_type* __to_end, extern_type*& __to_next) const;

virtual int
      do_encoding() const throw();

virtual bool
      do_always_noconv() const throw();

virtual int
      do_length(state_type&, const extern_type* __from,
		const extern_type* __end, size_t __max) const;

virtual int
      do_max_length() const throw();
    };

template<typename _InternT, typename _ExternT, typename _StateT>
    locale::id codecvt<_InternT, _ExternT, _StateT>::id;

/// class codecvt<char, char, mbstate_t> specialization.
  template<>
    class codecvt<char, char, mbstate_t>
    : public __codecvt_abstract_base<char, char, mbstate_t>
    {
      friend class messages<char>;

public:
      // Types:
      typedef char			intern_type;
      typedef char			extern_type;
      typedef mbstate_t			state_type;

protected:
      __c_locale			_M_c_locale_codecvt;

public:
      static locale::id id;

explicit
      codecvt(size_t __refs = 0);

explicit
      codecvt(__c_locale __cloc, size_t __refs = 0);

protected:
      virtual
      ~codecvt();

virtual result
      do_unshift(state_type& __state, extern_type* __to,
		 extern_type* __to_end, extern_type*& __to_next) const;

virtual int
      do_encoding() const throw();

virtual bool
      do_always_noconv() const throw();

virtual int
      do_length(state_type&, const extern_type* __from,
		const extern_type* __end, size_t __max) const;

virtual int
      do_max_length() const throw();
  };

#ifdef _GLIBCXX_USE_WCHAR_T
  /** @brief  Class codecvt<wchar_t, char, mbstate_t> specialization.
   *
   *  Converts between narrow and wide characters in the native character set
   */
  template<>
    class codecvt<wchar_t, char, mbstate_t>
    : public __codecvt_abstract_base<wchar_t, char, mbstate_t>
    {
      friend class messages<wchar_t>;

public:
      // Types:
      typedef wchar_t			intern_type;
      typedef char			extern_type;
      typedef mbstate_t			state_type;

protected:
      __c_locale			_M_c_locale_codecvt;

public:
      static locale::id			id;

explicit
      codecvt(size_t __refs = 0);

explicit
      codecvt(__c_locale __cloc, size_t __refs = 0);

protected:
      virtual
      ~codecvt();

virtual result
      do_unshift(state_type& __state,
		 extern_type* __to, extern_type* __to_end,
		 extern_type*& __to_next) const;

virtual result
      do_in(state_type& __state,
	     const extern_type* __from, const extern_type* __from_end,
	     const extern_type*& __from_next,
	     intern_type* __to, intern_type* __to_end,
	     intern_type*& __to_next) const;

virtual
      int do_encoding() const throw();

virtual
      bool do_always_noconv() const throw();

virtual
      int do_length(state_type&, const extern_type* __from,
		    const extern_type* __end, size_t __max) const;

virtual int
      do_max_length() const throw();
    };
#endif //_GLIBCXX_USE_WCHAR_T

#if __cplusplus >= 201103L
#ifdef _GLIBCXX_USE_C99_STDINT_TR1
  /** @brief  Class codecvt<char16_t, char, mbstate_t> specialization.
   *
   *  Converts between UTF-16 and UTF-8.
   */
  template<>
    class codecvt<char16_t, char, mbstate_t>
    : public __codecvt_abstract_base<char16_t, char, mbstate_t>
    {
    public:
      // Types:
      typedef char16_t			intern_type;
      typedef char			extern_type;
      typedef mbstate_t			state_type;

public:
      static locale::id			id;

explicit
      codecvt(size_t __refs = 0)
      : __codecvt_abstract_base<char16_t, char, mbstate_t>(__refs) { }

protected:
      virtual
      ~codecvt();

virtual result
      do_unshift(state_type& __state,
		 extern_type* __to, extern_type* __to_end,
		 extern_type*& __to_next) const;

virtual result
      do_in(state_type& __state,
	     const extern_type* __from, const extern_type* __from_end,
	     const extern_type*& __from_next,
	     intern_type* __to, intern_type* __to_end,
	     intern_type*& __to_next) const;

virtual
      int do_encoding() const throw();

virtual
      bool do_always_noconv() const throw();

virtual
      int do_length(state_type&, const extern_type* __from,
		    const extern_type* __end, size_t __max) const;

virtual int
      do_max_length() const throw();
    };

/** @brief  Class codecvt<char32_t, char, mbstate_t> specialization.
   *
   *  Converts between UTF-32 and UTF-8.
   */
  template<>
    class codecvt<char32_t, char, mbstate_t>
    : public __codecvt_abstract_base<char32_t, char, mbstate_t>
    {
    public:
      // Types:
      typedef char32_t			intern_type;
      typedef char			extern_type;
      typedef mbstate_t			state_type;

public:
      static locale::id			id;

explicit
      codecvt(size_t __refs = 0)
      : __codecvt_abstract_base<char32_t, char, mbstate_t>(__refs) { }

protected:
      virtual
      ~codecvt();

virtual result
      do_unshift(state_type& __state,
		 extern_type* __to, extern_type* __to_end,
		 extern_type*& __to_next) const;

virtual result
      do_in(state_type& __state,
	     const extern_type* __from, const extern_type* __from_end,
	     const extern_type*& __from_next,
	     intern_type* __to, intern_type* __to_end,
	     intern_type*& __to_next) const;

virtual
      int do_encoding() const throw();

virtual
      bool do_always_noconv() const throw();

virtual
      int do_length(state_type&, const extern_type* __from,
		    const extern_type* __end, size_t __max) const;

virtual int
      do_max_length() const throw();
    };

#endif // _GLIBCXX_USE_C99_STDINT_TR1
#endif // C++11

/// class codecvt_byname [22.2.1.6].
  template<typename _InternT, typename _ExternT, typename _StateT>
    class codecvt_byname : public codecvt<_InternT, _ExternT, _StateT>
    {
    public:
      explicit
      codecvt_byname(const char* __s, size_t __refs = 0)
      : codecvt<_InternT, _ExternT, _StateT>(__refs)
      {
	if (__builtin_strcmp(__s, "C") != 0
	    && __builtin_strcmp(__s, "POSIX") != 0)
	  {
	    this->_S_destroy_c_locale(this->_M_c_locale_codecvt);
	    this->_S_create_c_locale(this->_M_c_locale_codecvt, __s);
	  }
      }

#if __cplusplus >= 201103L
      explicit
      codecvt_byname(const string& __s, size_t __refs = 0)
      : codecvt_byname(__s.c_str(), __refs) { }
#endif

protected:
      virtual
      ~codecvt_byname() { }
    };

#if __cplusplus >= 201103L && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  template<>
    class codecvt_byname<char16_t, char, mbstate_t>
    : public codecvt<char16_t, char, mbstate_t>
    {
    public:
      explicit
      codecvt_byname(const char*, size_t __refs = 0)
      : codecvt<char16_t, char, mbstate_t>(__refs) { }

explicit
      codecvt_byname(const string& __s, size_t __refs = 0)
      : codecvt_byname(__s.c_str(), __refs) { }

protected:
      virtual
      ~codecvt_byname() { }
    };

template<>
    class codecvt_byname<char32_t, char, mbstate_t>
    : public codecvt<char32_t, char, mbstate_t>
    {
    public:
      explicit
      codecvt_byname(const char*, size_t __refs = 0)
      : codecvt<char32_t, char, mbstate_t>(__refs) { }

explicit
      codecvt_byname(const string& __s, size_t __refs = 0)
      : codecvt_byname(__s.c_str(), __refs) { }

protected:
      virtual
      ~codecvt_byname() { }
    };
#endif

// Inhibit implicit instantiations for required instantiations,
  // which are defined via explicit instantiations elsewhere.
#if _GLIBCXX_EXTERN_TEMPLATE
  extern template class codecvt_byname<char, char, mbstate_t>;

extern template
    const codecvt<char, char, mbstate_t>&
    use_facet<codecvt<char, char, mbstate_t> >(const locale&);

extern template
    bool
    has_facet<codecvt<char, char, mbstate_t> >(const locale&);

#ifdef _GLIBCXX_USE_WCHAR_T
  extern template class codecvt_byname<wchar_t, char, mbstate_t>;

extern template
    const codecvt<wchar_t, char, mbstate_t>&
    use_facet<codecvt<wchar_t, char, mbstate_t> >(const locale&);

extern template
    bool
    has_facet<codecvt<wchar_t, char, mbstate_t> >(const locale&);
#endif

#if __cplusplus >= 201103L && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  extern template class codecvt_byname<char16_t, char, mbstate_t>;
  extern template class codecvt_byname<char32_t, char, mbstate_t>;
#endif

#endif

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif // _CODECVT_H

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