vstring_util.h

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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 */

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