vstring_util.h
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// Versatile string utility -*- C++ -*-
// Copyright (C) 2005-2025 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 is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{ext/vstring.h}
*/
#ifndef _VSTRING_UTIL_H
#define _VSTRING_UTIL_H 1
#ifdef _GLIBCXX_SYSHDR
#pragma GCC system_header
#endif
#include <bits/requires_hosted.h> // GNU extensions are currently omitted
#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 <ext/alloc_traits.h>
#include <bits/move.h>
#include <bits/range_access.h>
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _CharT, typename _Traits, typename _Alloc>
struct __vstring_utility
{
typedef typename __alloc_traits<_Alloc>::template rebind<_CharT>::other
_CharT_alloc_type;
typedef __alloc_traits<_CharT_alloc_type> _CharT_alloc_traits;
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_traits::pointer pointer;
typedef typename _CharT_alloc_traits::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_VERSION
} // namespace
#endif /* _VSTRING_UTIL_H */
move.h
ostream_insert.h
requires_hosted.h
functexcept.h
range_access.h
stl_function.h
localefwd.h
debug.h
vstring_fwd.h
__gnu_cxx
GNU extensions for public use.
alloc_traits.h
stl_iterator.h
numeric_traits.h