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// Versatile string utility -*- C++ -*-

// Copyright (C) 2005, 2006, 2007, 2008, 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/vstring_util.h

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

 *  This is an internal header file, included by other library headers.

 *  You should not attempt to use it directly.

 */

#ifndef _VSTRING_UTIL_H

#define _VSTRING_UTIL_H 1

#pragma GCC system_header

#include <ext/vstring_fwd.h>

#include <debug/debug.h>

#include <bits/stl_function.h>  // For less

#include <bits/functexcept.h>

#include <bits/localefwd.h>

#include <bits/ostream_insert.h>

#include <bits/stl_iterator.h>

#include <ext/numeric_traits.h>

#include <bits/move.h>

_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

  template<typename _CharT, typename _Traits, typename _Alloc>

    struct __vstring_utility

    {

      typedef typename _Alloc::template rebind<_CharT>::other _CharT_alloc_type;

      typedef _Traits                                       traits_type;

      typedef typename _Traits::char_type                   value_type;

      typedef typename _CharT_alloc_type::size_type         size_type;

      typedef typename _CharT_alloc_type::difference_type   difference_type;

      typedef typename _CharT_alloc_type::pointer           pointer;

      typedef typename _CharT_alloc_type::const_pointer     const_pointer;

      // For __sso_string.

      typedef __gnu_cxx::

      __normal_iterator<pointer, __gnu_cxx::

                        __versa_string<_CharT, _Traits, _Alloc,

                                       __sso_string_base> >

        __sso_iterator;

      typedef __gnu_cxx::

      __normal_iterator<const_pointer, __gnu_cxx::

                        __versa_string<_CharT, _Traits, _Alloc,

                                       __sso_string_base> >

        __const_sso_iterator;

      // For __rc_string.

      typedef __gnu_cxx::

      __normal_iterator<pointer, __gnu_cxx::

                        __versa_string<_CharT, _Traits, _Alloc,

                                       __rc_string_base> >

        __rc_iterator;

      typedef __gnu_cxx::

      __normal_iterator<const_pointer, __gnu_cxx::

                        __versa_string<_CharT, _Traits, _Alloc,

                                       __rc_string_base> >

        __const_rc_iterator;

      // NB:  When the allocator is empty, deriving from it saves space 

      // (http://www.cantrip.org/emptyopt.html).

      template<typename _Alloc1>

        struct _Alloc_hider

        : public _Alloc1

        {

          _Alloc_hider(_CharT* __ptr)

          : _Alloc1(), _M_p(__ptr) { }

          _Alloc_hider(const _Alloc1& __a, _CharT* __ptr)

          : _Alloc1(__a), _M_p(__ptr) { }

          _CharT*  _M_p; // The actual data.

        };

      // When __n = 1 way faster than the general multichar

      // traits_type::copy/move/assign.

      static void

      _S_copy(_CharT* __d, const _CharT* __s, size_type __n)

      {

        if (__n == 1)

          traits_type::assign(*__d, *__s);

        else

          traits_type::copy(__d, __s, __n);

      }

      static void

      _S_move(_CharT* __d, const _CharT* __s, size_type __n)

      {

        if (__n == 1)

          traits_type::assign(*__d, *__s);

        else

          traits_type::move(__d, __s, __n);

      }

      static void

      _S_assign(_CharT* __d, size_type __n, _CharT __c)

      {

        if (__n == 1)

          traits_type::assign(*__d, __c);

        else

          traits_type::assign(__d, __n, __c);

      }

      // _S_copy_chars is a separate template to permit specialization

      // to optimize for the common case of pointers as iterators.

      template<typename _Iterator>

        static void

        _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2)

        {

          for (; __k1 != __k2; ++__k1, ++__p)

            traits_type::assign(*__p, *__k1); // These types are off.

        }

      static void

      _S_copy_chars(_CharT* __p, __sso_iterator __k1, __sso_iterator __k2)

      { _S_copy_chars(__p, __k1.base(), __k2.base()); }

      static void

      _S_copy_chars(_CharT* __p, __const_sso_iterator __k1,

                    __const_sso_iterator __k2)

      { _S_copy_chars(__p, __k1.base(), __k2.base()); }

      static void

      _S_copy_chars(_CharT* __p, __rc_iterator __k1, __rc_iterator __k2)

      { _S_copy_chars(__p, __k1.base(), __k2.base()); }

      static void

      _S_copy_chars(_CharT* __p, __const_rc_iterator __k1,

                    __const_rc_iterator __k2)

      { _S_copy_chars(__p, __k1.base(), __k2.base()); }

      static void

      _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2)

      { _S_copy(__p, __k1, __k2 - __k1); }

      static void

      _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2)

      { _S_copy(__p, __k1, __k2 - __k1); }

      static int

      _S_compare(size_type __n1, size_type __n2)

      {

        const difference_type __d = difference_type(__n1 - __n2);

        if (__d > __numeric_traits_integer<int>::__max)

          return __numeric_traits_integer<int>::__max;

        else if (__d < __numeric_traits_integer<int>::__min)

          return __numeric_traits_integer<int>::__min;

        else

          return int(__d);

      }

    };

_GLIBCXX_END_NAMESPACE

#endif /* _VSTRING_UTIL_H */