# vstring_util.h

Go to the documentation of this file.

    00001 // Versatile string utility -*- C++ -*-
    00002
    00003 // Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
    00004 //
    00005 // This file is part of the GNU ISO C++ Library.  This library is free
    00006 // software; you can redistribute it and/or modify it under the
    00007 // terms of the GNU General Public License as published by the
    00008 // Free Software Foundation; either version 2, or (at your option)
    00009 // any later version.
    00010
    00011 // This library is distributed in the hope that it will be useful,
    00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00014 // GNU General Public License for more details.
    00015
    00016 // You should have received a copy of the GNU General Public License along
    00017 // with this library; see the file COPYING.  If not, write to the Free
    00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
    00019 // USA.
    00020
    00021 // As a special exception, you may use this file as part of a free software
    00022 // library without restriction.  Specifically, if other files instantiate
    00023 // templates or use macros or inline functions from this file, or you compile
    00024 // this file and link it with other files to produce an executable, this
    00025 // file does not by itself cause the resulting executable to be covered by
    00026 // the GNU General Public License.  This exception does not however
    00027 // invalidate any other reasons why the executable file might be covered by
    00028 // the GNU General Public License.
    00029
    00030 /** @file ext/vstring_util.h
    00031  *  This file is a GNU extension to the Standard C++ Library.
    00032  *  This is an internal header file, included by other library headers.
    00033  *  You should not attempt to use it directly.
    00034  */
    00035
    00036 #ifndef _VSTRING_UTIL_H
    00037 #define _VSTRING_UTIL_H 1
    00038
    00039 #pragma GCC system_header
    00040
    00041 #include <ext/vstring_fwd.h>
    00042 #include <debug/debug.h>
    00043 #include <bits/stl_function.h>  // For less
    00044 #include <bits/functexcept.h>
    00045 #include <locale>
    00046 #include <algorithm> // For std::distance, srd::search.
    00047 #include <bits/ostream_insert.h>
    00048
    00049 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
    00050
    00051   template<typename _CharT, typename _Traits, typename _Alloc>
    00052     struct __vstring_utility
    00053     {
    00054       typedef typename _Alloc::template rebind<_CharT>::other _CharT_alloc_type;
    00055
    00056       typedef _Traits                       traits_type;
    00057       typedef typename _Traits::char_type           value_type;
    00058       typedef typename _CharT_alloc_type::size_type     size_type;
    00059       typedef typename _CharT_alloc_type::pointer       pointer;
    00060       typedef typename _CharT_alloc_type::const_pointer     const_pointer;
    00061
    00062       // For __sso_string.
    00063       typedef __gnu_cxx::
    00064       __normal_iterator<pointer, __gnu_cxx::
    00065             __versa_string<_CharT, _Traits, _Alloc,
    00066                        __sso_string_base> >
    00067         __sso_iterator;
    00068       typedef __gnu_cxx::
    00069       __normal_iterator<const_pointer, __gnu_cxx::
    00070             __versa_string<_CharT, _Traits, _Alloc,
    00071                        __sso_string_base> >
    00072         __const_sso_iterator;
    00073
    00074       // For __rc_string.
    00075       typedef __gnu_cxx::
    00076       __normal_iterator<pointer, __gnu_cxx::
    00077             __versa_string<_CharT, _Traits, _Alloc,
    00078                        __rc_string_base> >
    00079         __rc_iterator;
    00080       typedef __gnu_cxx::
    00081       __normal_iterator<const_pointer, __gnu_cxx::
    00082             __versa_string<_CharT, _Traits, _Alloc,
    00083                        __rc_string_base> >
    00084         __const_rc_iterator;
    00085
    00086       // NB:  When the allocator is empty, deriving from it saves space
    00087       // (http://www.cantrip.org/emptyopt.html).
    00088       template<typename _Alloc1>
    00089         struct _Alloc_hider
    00090     : public _Alloc1
    00091     {
    00092       _Alloc_hider(const _Alloc1& __a, _CharT* __ptr)
    00093       : _Alloc1(__a), _M_p(__ptr) { }
    00094
    00095       _CharT*  _M_p; // The actual data.
    00096     };
    00097
    00098       // For use in _M_construct (_S_construct) forward_iterator_tag.
    00099       template<typename _Type>
    00100         static bool
    00101         _S_is_null_pointer(_Type* __ptr)
    00102         { return __ptr == 0; }
    00103
    00104       template<typename _Type>
    00105         static bool
    00106         _S_is_null_pointer(_Type)
    00107         { return false; }
    00108
    00109       // When __n = 1 way faster than the general multichar
    00110       // traits_type::copy/move/assign.
    00111       static void
    00112       _S_copy(_CharT* __d, const _CharT* __s, size_type __n)
    00113       {
    00114     if (__n == 1)
    00115       traits_type::assign(*__d, *__s);
    00116     else
    00117       traits_type::copy(__d, __s, __n);
    00118       }
    00119
    00120       static void
    00121       _S_move(_CharT* __d, const _CharT* __s, size_type __n)
    00122       {
    00123     if (__n == 1)
    00124       traits_type::assign(*__d, *__s);
    00125     else
    00126       traits_type::move(__d, __s, __n);
    00127       }
    00128
    00129       static void
    00130       _S_assign(_CharT* __d, size_type __n, _CharT __c)
    00131       {
    00132     if (__n == 1)
    00133       traits_type::assign(*__d, __c);
    00134     else
    00135       traits_type::assign(__d, __n, __c);
    00136       }
    00137
    00138       // _S_copy_chars is a separate template to permit specialization
    00139       // to optimize for the common case of pointers as iterators.
    00140       template<typename _Iterator>
    00141         static void
    00142         _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2)
    00143         {
    00144       for (; __k1 != __k2; ++__k1, ++__p)
    00145         traits_type::assign(*__p, *__k1); // These types are off.
    00146     }
    00147
    00148       static void
    00149       _S_copy_chars(_CharT* __p, __sso_iterator __k1, __sso_iterator __k2)
    00150       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
    00151
    00152       static void
    00153       _S_copy_chars(_CharT* __p, __const_sso_iterator __k1,
    00154             __const_sso_iterator __k2)
    00155       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
    00156
    00157       static void
    00158       _S_copy_chars(_CharT* __p, __rc_iterator __k1, __rc_iterator __k2)
    00159       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
    00160
    00161       static void
    00162       _S_copy_chars(_CharT* __p, __const_rc_iterator __k1,
    00163             __const_rc_iterator __k2)
    00164       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
    00165
    00166       static void
    00167       _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2)
    00168       { _S_copy(__p, __k1, __k2 - __k1); }
    00169
    00170       static void
    00171       _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2)
    00172       { _S_copy(__p, __k1, __k2 - __k1); }
    00173     };
    00174
    00175 _GLIBCXX_END_NAMESPACE
    00176
    00177 #endif /* _VSTRING_UTIL_H */