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+// Locale support (codecvt) -*- C++ -*-
+
+// Copyright (C) 2000, 2001 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 2, 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.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING. If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction. Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License. This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+//
+// ISO C++ 14882: 22.2.1.5 Template class codecvt
+//
+
+// Written by Benjamin Kosnik <bkoz@cygnus.com>
+
+/** @file codecvt.h
+ * This is an internal header file, included by other library headers.
+ * You should not attempt to use it directly.
+ */
+
+#ifndef _CPP_BITS_CODECVT_H
+#define _CPP_BITS_CODECVT_H 1
+
+#pragma GCC system_header
+
+ // 22.2.1.5 Template class codecvt
+ class codecvt_base
+ {
+ public:
+ enum result
+ {
+ ok,
+ partial,
+ error,
+ noconv
+ };
+ };
+
+ // Template class __codecvt_abstract_base
+ // NB: An abstract base class that fills in the public inlines, so
+ // that the specializations don't have to re-copy the public
+ // interface.
+ 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
+ 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);
+ }
+
+ 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); }
+
+ 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(const 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() { }
+
+ 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(const state_type&, const extern_type* __from,
+ const extern_type* __end, size_t __max) const = 0;
+
+ virtual int
+ do_max_length() const throw() = 0;
+ };
+
+ // 22.2.1.5 Template class codecvt
+ // 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;
+
+ // Data Members:
+ static locale::id id;
+
+ explicit
+ codecvt(size_t __refs = 0)
+ : __codecvt_abstract_base<_InternT,_ExternT,_StateT> (__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(const 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;
+
+ // codecvt<char, char, mbstate_t> required specialization
+ template<>
+ class codecvt<char, char, mbstate_t>
+ : public __codecvt_abstract_base<char, char, mbstate_t>
+ {
+ public:
+ // Types:
+ typedef char intern_type;
+ typedef char extern_type;
+ typedef mbstate_t state_type;
+
+ // Data Members:
+ static locale::id id;
+
+ explicit
+ codecvt(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(const state_type&, const extern_type* __from,
+ const extern_type* __end, size_t __max) const;
+
+ virtual int
+ do_max_length() const throw();
+ };
+
+#ifdef _GLIBCPP_USE_WCHAR_T
+ // codecvt<wchar_t, char, mbstate_t> required specialization
+ template<>
+ class codecvt<wchar_t, char, mbstate_t>
+ : public __codecvt_abstract_base<wchar_t, char, mbstate_t>
+ {
+ public:
+ // Types:
+ typedef wchar_t intern_type;
+ typedef char extern_type;
+ typedef mbstate_t state_type;
+
+ // Data Members:
+ static locale::id id;
+
+ explicit
+ codecvt(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(const state_type&, const extern_type* __from,
+ const extern_type* __end, size_t __max) const;
+
+ virtual int
+ do_max_length() const throw();
+ };
+#endif //_GLIBCPP_USE_WCHAR_T
+
+ // 22.2.1.6 Template class codecvt_byname
+ template<typename _InternT, typename _ExternT, typename _StateT>
+ class codecvt_byname : public codecvt<_InternT, _ExternT, _StateT>
+ {
+ public:
+ explicit
+ codecvt_byname(const char*, size_t __refs = 0)
+ : codecvt<_InternT, _ExternT, _StateT>(__refs) { }
+ protected:
+ virtual
+ ~codecvt_byname() { }
+ };
+
+ // Include host and configuration specific partial specializations
+ // with additional functionality, if possible.
+#ifdef _GLIBCPP_USE_WCHAR_T
+ #include <bits/codecvt_specializations.h>
+#endif
+
+#endif // _CPP_BITS_CODECVT_H
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