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// String utility -*- C++ -*-
// Copyright (C) 2005 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.
/** @file ext/string_util.h
* This file is a GNU extension to the Standard C++ Library.
*/
#ifndef _STRING_UTIL_H
#define _STRING_UTIL_H 1
#include <bits/functexcept.h>
#include <bits/stringfwd.h>
#include <cstddef>
#include <bits/stl_iterator_base_types.h>
#include <bits/stl_iterator.h>
#include <bits/cpp_type_traits.h>
#include <algorithm> // For std::distance, srd::search.
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
template<typename _CharT, typename _Traits, typename _Alloc>
struct __string_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::pointer pointer;
typedef typename _CharT_alloc_type::const_pointer const_pointer;
typedef __gnu_cxx::
__normal_iterator<pointer,
std::basic_string<_CharT, _Traits, _Alloc> >
iterator;
typedef __gnu_cxx::
__normal_iterator<const_pointer,
std::basic_string<_CharT, _Traits, _Alloc> >
const_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(const _Alloc1& __a, _CharT* __ptr)
: _Alloc1(__a), _M_p(__ptr) { }
_CharT* _M_p; // The actual data.
};
// For use in _M_construct (_S_construct) forward_iterator_tag.
template<typename _Type>
static bool
_S_is_null_pointer(_Type* __ptr)
{ return __ptr == 0; }
template<typename _Type>
static bool
_S_is_null_pointer(_Type)
{ return false; }
// 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, iterator __k1, iterator __k2)
{ _S_copy_chars(__p, __k1.base(), __k2.base()); }
static void
_S_copy_chars(_CharT* __p, const_iterator __k1, const_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); }
};
_GLIBCXX_END_NAMESPACE
#endif /* _STRING_UTIL_H */
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