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// POD character, std::char_traits specialization -*- C++ -*-

// Copyright (C) 2002, 2003, 2004, 2005, 2007, 2009 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 ext/pod_char_traits.h

 *  This file is a GNU extension to the Standard C++ Library.

 */

// Gabriel Dos Reis <gdr@integrable-solutions.net>

// Benjamin Kosnik <bkoz@redhat.com>

#ifndef _POD_CHAR_TRAITS_H

#define _POD_CHAR_TRAITS_H 1

#include <string>

_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

  // POD character abstraction.

  // NB: The char_type parameter is a subset of int_type, as to allow

  // int_type to properly hold the full range of char_type values as

  // well as EOF.

  /// @brief A POD class that serves as a character abstraction class.

  template<typename V, typename I, typename S = std::mbstate_t>

    struct character

    {

      typedef V                         value_type;

      typedef I                         int_type;

      typedef S                         state_type;

      typedef character<V, I, S>        char_type;

      value_type        value;

      template<typename V2>

        static char_type

        from(const V2& v)

        {

          char_type ret = { static_cast<value_type>(v) };

          return ret;

        }

      template<typename V2>

        static V2

        to(const char_type& c)

        {

          V2 ret = { static_cast<V2>(c.value) };

          return ret;

        }

    };

  template<typename V, typename I, typename S>

    inline bool

    operator==(const character<V, I, S>& lhs, const character<V, I, S>& rhs)

    { return lhs.value == rhs.value; }

  template<typename V, typename I, typename S>

    inline bool

    operator<(const character<V, I, S>& lhs, const character<V, I, S>& rhs)

    { return lhs.value < rhs.value; }

_GLIBCXX_END_NAMESPACE

_GLIBCXX_BEGIN_NAMESPACE(std)

  /// char_traits<__gnu_cxx::character> specialization.

  template<typename V, typename I, typename S>

    struct char_traits<__gnu_cxx::character<V, I, S> >

    {

      typedef __gnu_cxx::character<V, I, S>     char_type;

      typedef typename char_type::int_type      int_type;

      typedef typename char_type::state_type    state_type;

      typedef fpos<state_type>                  pos_type;

      typedef streamoff                         off_type;

      static void

      assign(char_type& __c1, const char_type& __c2)

      { __c1 = __c2; }

      static bool

      eq(const char_type& __c1, const char_type& __c2)

      { return __c1 == __c2; }

      static bool

      lt(const char_type& __c1, const char_type& __c2)

      { return __c1 < __c2; }

      static int

      compare(const char_type* __s1, const char_type* __s2, size_t __n)

      {

        for (size_t __i = 0; __i < __n; ++__i)

          if (!eq(__s1[__i], __s2[__i]))

            return lt(__s1[__i], __s2[__i]) ? -1 : 1;

        return 0;

      }

      static size_t

      length(const char_type* __s)

      {

        const char_type* __p = __s;

        while (__p->value)

          ++__p;

        return (__p - __s);

      }

      static const char_type*

      find(const char_type* __s, size_t __n, const char_type& __a)

      {

        for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)

          if (*__p == __a)

            return __p;

        return 0;

      }

      static char_type*

      move(char_type* __s1, const char_type* __s2, size_t __n)

      {

        return static_cast<char_type*>

          (__builtin_memmove(__s1, __s2, __n * sizeof(char_type)));

      }

      static char_type*

      copy(char_type* __s1, const char_type* __s2, size_t __n)

      {

        std::copy(__s2, __s2 + __n, __s1);

        return __s1;

      }

      static char_type*

      assign(char_type* __s, size_t __n, char_type __a)

      {

        std::fill_n(__s, __n, __a);

        return __s;

      }

      static char_type

      to_char_type(const int_type& __i)

      { return char_type::template from(__i); }

      static int_type

      to_int_type(const char_type& __c)

      { return char_type::template to<int_type>(__c); }

      static bool

      eq_int_type(const int_type& __c1, const int_type& __c2)

      { return __c1 == __c2; }

      static int_type

      eof()

      {

        int_type __r = { -1 };

        return __r;

      }

      static int_type

      not_eof(const int_type& __c)

      { return eq_int_type(__c, eof()) ? int_type() : __c; }

    };

_GLIBCXX_END_NAMESPACE

#endif