gnu/dist/gcc4/libstdc++-v3/include/ext/vstring_util.h

   1 // Versatile string utility -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 /** @file ext/vstring_util.h
  31  *  This file is a GNU extension to the Standard C++ Library.
  32  *  This is an internal header file, included by other library headers.
  33  *  You should not attempt to use it directly.
  34  */
  35
  36 #ifndef _VSTRING_UTIL_H
  37 #define _VSTRING_UTIL_H 1
  38
  39 #pragma GCC system_header
  40
  41 #include <ext/vstring_fwd.h>
  42 #include <debug/debug.h>
  43 #include <bits/stl_function.h>  // For less
  44 #include <bits/functexcept.h>
  45 #include <locale>
  46 #include <algorithm> // For std::distance, srd::search.
  47
  48 namespace __gnu_cxx
  49 {
  50   template<typename _CharT, typename _Traits, typename _Alloc>
  51     struct __vstring_utility
  52     {
  53       typedef typename _Alloc::template rebind<_CharT>::other _CharT_alloc_type;
  54
  55       typedef _Traits                                       traits_type;
  56       typedef typename _Traits::char_type                   value_type;
  57       typedef typename _CharT_alloc_type::size_type         size_type;
  58       typedef typename _CharT_alloc_type::pointer           pointer;
  59       typedef typename _CharT_alloc_type::const_pointer     const_pointer;
  60
  61       // For __sso_string.
  62       typedef __gnu_cxx::
  63       __normal_iterator<pointer, __gnu_cxx::
  64                         __versa_string<_CharT, _Traits, _Alloc,
  65                                        __sso_string_base> >
  66         __sso_iterator;
  67       typedef __gnu_cxx::
  68       __normal_iterator<const_pointer, __gnu_cxx::
  69                         __versa_string<_CharT, _Traits, _Alloc,
  70                                        __sso_string_base> >
  71         __const_sso_iterator;
  72
  73       // For __rc_string.
  74       typedef __gnu_cxx::
  75       __normal_iterator<pointer, __gnu_cxx::
  76                         __versa_string<_CharT, _Traits, _Alloc,
  77                                        __rc_string_base> >
  78         __rc_iterator;
  79       typedef __gnu_cxx::
  80       __normal_iterator<const_pointer, __gnu_cxx::
  81                         __versa_string<_CharT, _Traits, _Alloc,
  82                                        __rc_string_base> >
  83         __const_rc_iterator;
  84
  85       // NB:  When the allocator is empty, deriving from it saves space
  86       // (http://www.cantrip.org/emptyopt.html).
  87       template<typename _Alloc1>
  88         struct _Alloc_hider
  89         : public _Alloc1
  90         {
  91           _Alloc_hider(const _Alloc1& __a, _CharT* __ptr)
  92           : _Alloc1(__a), _M_p(__ptr) { }
  93
  94           _CharT*  _M_p; // The actual data.
  95         };
  96
  97       // For use in _M_construct (_S_construct) forward_iterator_tag.
  98       template<typename _Type>
  99         static bool
 100         _S_is_null_pointer(_Type* __ptr)
 101         { return __ptr == 0; }
 102
 103       template<typename _Type>
 104         static bool
 105         _S_is_null_pointer(_Type)
 106         { return false; }
 107
 108       // When __n = 1 way faster than the general multichar
 109       // traits_type::copy/move/assign.
 110       static void
 111       _S_copy(_CharT* __d, const _CharT* __s, size_type __n)
 112       {
 113         if (__n == 1)
 114           traits_type::assign(*__d, *__s);
 115         else
 116           traits_type::copy(__d, __s, __n);
 117       }
 118
 119       static void
 120       _S_move(_CharT* __d, const _CharT* __s, size_type __n)
 121       {
 122         if (__n == 1)
 123           traits_type::assign(*__d, *__s);
 124         else
 125           traits_type::move(__d, __s, __n);
 126       }
 127
 128       static void
 129       _S_assign(_CharT* __d, size_type __n, _CharT __c)
 130       {
 131         if (__n == 1)
 132           traits_type::assign(*__d, __c);
 133         else
 134           traits_type::assign(__d, __n, __c);
 135       }
 136
 137       // _S_copy_chars is a separate template to permit specialization
 138       // to optimize for the common case of pointers as iterators.
 139       template<typename _Iterator>
 140         static void
 141         _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2)
 142         {
 143           for (; __k1 != __k2; ++__k1, ++__p)
 144             traits_type::assign(*__p, *__k1); // These types are off.
 145         }
 146
 147       static void
 148       _S_copy_chars(_CharT* __p, __sso_iterator __k1, __sso_iterator __k2)
 149       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
 150
 151       static void
 152       _S_copy_chars(_CharT* __p, __const_sso_iterator __k1,
 153                     __const_sso_iterator __k2)
 154       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
 155
 156       static void
 157       _S_copy_chars(_CharT* __p, __rc_iterator __k1, __rc_iterator __k2)
 158       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
 159
 160       static void
 161       _S_copy_chars(_CharT* __p, __const_rc_iterator __k1,
 162                     __const_rc_iterator __k2)
 163       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
 164
 165       static void
 166       _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2)
 167       { _S_copy(__p, __k1, __k2 - __k1); }
 168
 169       static void
 170       _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2)
 171       { _S_copy(__p, __k1, __k2 - __k1); }
 172     };
 173 } // namespace __gnu_cxx
 174
 175 namespace std
 176 {
 177   // To implement Option 3 of DR 431 (vstring only in 4_1-branch).
 178   template<typename _Alloc, bool = std::__is_empty<_Alloc>::__value>
 179     struct __alloc_swap
 180     { static void _S_do_it(_Alloc&, _Alloc&) { } };
 181
 182   template<typename _Alloc>
 183     struct __alloc_swap<_Alloc, false>
 184     {
 185       static void
 186       _S_do_it(_Alloc& __one, _Alloc& __two)
 187       {
 188         // Precondition: swappable allocators.
 189         if (__one != __two)
 190           swap(__one, __two);
 191       }
 192     };
 193 }
 194
 195 #endif /* _VSTRING_UTIL_H */