--- /dev/null
+// Versatile string utility -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010
+// 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
+
+#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>
+#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::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_VERSION
+} // namespace
+
+#endif /* _VSTRING_UTIL_H */
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