libstdc++-v3/include/ext/vstring_util.h

   1 // Versatile string utility -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006, 2007 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 <bits/localefwd.h>
  46 #include <bits/ostream_insert.h>
  47 #include <bits/stl_iterator.h>
  48 #include <ext/numeric_traits.h>
  49 #include <bits/stl_move.h>
  50
  51 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
  52
  53   template<typename _CharT, typename _Traits, typename _Alloc>
  54     struct __vstring_utility
  55     {
  56       typedef typename _Alloc::template rebind<_CharT>::other _CharT_alloc_type;
  57
  58       typedef _Traits                                       traits_type;
  59       typedef typename _Traits::char_type                   value_type;
  60       typedef typename _CharT_alloc_type::size_type         size_type;
  61       typedef typename _CharT_alloc_type::difference_type   difference_type;
  62       typedef typename _CharT_alloc_type::pointer           pointer;
  63       typedef typename _CharT_alloc_type::const_pointer     const_pointer;
  64
  65       // For __sso_string.
  66       typedef __gnu_cxx::
  67       __normal_iterator<pointer, __gnu_cxx::
  68                         __versa_string<_CharT, _Traits, _Alloc,
  69                                        __sso_string_base> >
  70         __sso_iterator;
  71       typedef __gnu_cxx::
  72       __normal_iterator<const_pointer, __gnu_cxx::
  73                         __versa_string<_CharT, _Traits, _Alloc,
  74                                        __sso_string_base> >
  75         __const_sso_iterator;
  76
  77       // For __rc_string.
  78       typedef __gnu_cxx::
  79       __normal_iterator<pointer, __gnu_cxx::
  80                         __versa_string<_CharT, _Traits, _Alloc,
  81                                        __rc_string_base> >
  82         __rc_iterator;
  83       typedef __gnu_cxx::
  84       __normal_iterator<const_pointer, __gnu_cxx::
  85                         __versa_string<_CharT, _Traits, _Alloc,
  86                                        __rc_string_base> >
  87         __const_rc_iterator;
  88
  89       // NB:  When the allocator is empty, deriving from it saves space
  90       // (http://www.cantrip.org/emptyopt.html).
  91       template<typename _Alloc1>
  92         struct _Alloc_hider
  93         : public _Alloc1
  94         {
  95           _Alloc_hider(_CharT* __ptr)
  96           : _Alloc1(), _M_p(__ptr) { }
  97
  98           _Alloc_hider(const _Alloc1& __a, _CharT* __ptr)
  99           : _Alloc1(__a), _M_p(__ptr) { }
 100
 101           _CharT*  _M_p; // The actual data.
 102         };
 103
 104       // When __n = 1 way faster than the general multichar
 105       // traits_type::copy/move/assign.
 106       static void
 107       _S_copy(_CharT* __d, const _CharT* __s, size_type __n)
 108       {
 109         if (__n == 1)
 110           traits_type::assign(*__d, *__s);
 111         else
 112           traits_type::copy(__d, __s, __n);
 113       }
 114
 115       static void
 116       _S_move(_CharT* __d, const _CharT* __s, size_type __n)
 117       {
 118         if (__n == 1)
 119           traits_type::assign(*__d, *__s);
 120         else
 121           traits_type::move(__d, __s, __n);
 122       }
 123
 124       static void
 125       _S_assign(_CharT* __d, size_type __n, _CharT __c)
 126       {
 127         if (__n == 1)
 128           traits_type::assign(*__d, __c);
 129         else
 130           traits_type::assign(__d, __n, __c);
 131       }
 132
 133       // _S_copy_chars is a separate template to permit specialization
 134       // to optimize for the common case of pointers as iterators.
 135       template<typename _Iterator>
 136         static void
 137         _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2)
 138         {
 139           for (; __k1 != __k2; ++__k1, ++__p)
 140             traits_type::assign(*__p, *__k1); // These types are off.
 141         }
 142
 143       static void
 144       _S_copy_chars(_CharT* __p, __sso_iterator __k1, __sso_iterator __k2)
 145       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
 146
 147       static void
 148       _S_copy_chars(_CharT* __p, __const_sso_iterator __k1,
 149                     __const_sso_iterator __k2)
 150       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
 151
 152       static void
 153       _S_copy_chars(_CharT* __p, __rc_iterator __k1, __rc_iterator __k2)
 154       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
 155
 156       static void
 157       _S_copy_chars(_CharT* __p, __const_rc_iterator __k1,
 158                     __const_rc_iterator __k2)
 159       { _S_copy_chars(__p, __k1.base(), __k2.base()); }
 160
 161       static void
 162       _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2)
 163       { _S_copy(__p, __k1, __k2 - __k1); }
 164
 165       static void
 166       _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2)
 167       { _S_copy(__p, __k1, __k2 - __k1); }
 168
 169       static int
 170       _S_compare(size_type __n1, size_type __n2)
 171       {
 172         const difference_type __d = difference_type(__n1 - __n2);
 173
 174         if (__d > __numeric_traits_integer<int>::__max)
 175           return __numeric_traits_integer<int>::__max;
 176         else if (__d < __numeric_traits_integer<int>::__min)
 177           return __numeric_traits_integer<int>::__min;
 178         else
 179           return int(__d);
 180       }
 181     };
 182
 183 _GLIBCXX_END_NAMESPACE
 184
 185 #endif /* _VSTRING_UTIL_H */