boost/boost/regex/v4/iterator_traits.hpp

   1 /*
   2  *
   3  * Copyright (c) 1998-2002
   4  * John Maddock
   5  *
   6  * Use, modification and distribution are subject to the
   7  * Boost Software License, Version 1.0. (See accompanying file
   8  * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9  *
  10  */
  11
  12  /*
  13   *   LOCATION:    see http://www.boost.org for most recent version.
  14   *   FILE         iterator_traits.cpp
  15   *   VERSION      see <boost/version.hpp>
  16   *   DESCRIPTION: Declares iterator traits workarounds.
  17   */
  18
  19 #ifndef BOOST_REGEX_V4_ITERATOR_TRAITS_HPP
  20 #define BOOST_REGEX_V4_ITERATOR_TRAITS_HPP
  21
  22 #ifdef BOOST_HAS_ABI_HEADERS
  23 #  include BOOST_ABI_PREFIX
  24 #endif
  25
  26 namespace boost{
  27 namespace re_detail{
  28
  29 #if defined(BOOST_NO_STD_ITERATOR_TRAITS) || defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
  30
  31 template <class T>
  32 struct regex_iterator_traits
  33 {
  34   typedef typename T::iterator_category iterator_category;
  35   typedef typename T::value_type        value_type;
  36 #if !defined(BOOST_NO_STD_ITERATOR)
  37   typedef typename T::difference_type   difference_type;
  38   typedef typename T::pointer           pointer;
  39   typedef typename T::reference         reference;
  40 #else
  41   typedef std::ptrdiff_t                difference_type;
  42   typedef value_type*                   pointer;
  43   typedef value_type&                   reference;
  44 #endif
  45 };
  46
  47 template <class T>
  48 struct pointer_iterator_traits
  49 {
  50    typedef std::ptrdiff_t difference_type;
  51    typedef T value_type;
  52    typedef T* pointer;
  53    typedef T& reference;
  54    typedef std::random_access_iterator_tag iterator_category;
  55 };
  56 template <class T>
  57 struct const_pointer_iterator_traits
  58 {
  59    typedef std::ptrdiff_t difference_type;
  60    typedef T value_type;
  61    typedef const T* pointer;
  62    typedef const T& reference;
  63    typedef std::random_access_iterator_tag iterator_category;
  64 };
  65
  66 template<>
  67 struct regex_iterator_traits<char*> : pointer_iterator_traits<char>{};
  68 template<>
  69 struct regex_iterator_traits<const char*> : const_pointer_iterator_traits<char>{};
  70 template<>
  71 struct regex_iterator_traits<wchar_t*> : pointer_iterator_traits<wchar_t>{};
  72 template<>
  73 struct regex_iterator_traits<const wchar_t*> : const_pointer_iterator_traits<wchar_t>{};
  74 //
  75 // the follwoing are needed for ICU support:
  76 //
  77 template<>
  78 struct regex_iterator_traits<unsigned char*> : pointer_iterator_traits<char>{};
  79 template<>
  80 struct regex_iterator_traits<const unsigned char*> : const_pointer_iterator_traits<char>{};
  81 template<>
  82 struct regex_iterator_traits<int*> : pointer_iterator_traits<int>{};
  83 template<>
  84 struct regex_iterator_traits<const int*> : const_pointer_iterator_traits<int>{};
  85
  86 #ifdef BOOST_REGEX_HAS_OTHER_WCHAR_T
  87 template<>
  88 struct regex_iterator_traits<unsigned short*> : pointer_iterator_traits<unsigned short>{};
  89 template<>
  90 struct regex_iterator_traits<const unsigned short*> : const_pointer_iterator_traits<unsigned short>{};
  91 #endif
  92
  93 #if defined(__SGI_STL_PORT) && defined(__STL_DEBUG)
  94 template<>
  95 struct regex_iterator_traits<std::string::iterator> : pointer_iterator_traits<char>{};
  96 template<>
  97 struct regex_iterator_traits<std::string::const_iterator> : const_pointer_iterator_traits<char>{};
  98 #ifndef BOOST_NO_STD_WSTRING
  99 template<>
 100 struct regex_iterator_traits<std::wstring::iterator> : pointer_iterator_traits<wchar_t>{};
 101 template<>
 102 struct regex_iterator_traits<std::wstring::const_iterator> : const_pointer_iterator_traits<wchar_t>{};
 103 #endif // BOOST_NO_WSTRING
 104 #endif // stport
 105
 106 #else
 107
 108 template <class T>
 109 struct regex_iterator_traits : public std::iterator_traits<T> {};
 110
 111 #endif
 112
 113 } // namespace re_detail
 114 } // namespace boost
 115
 116 #ifdef BOOST_HAS_ABI_HEADERS
 117 #  include BOOST_ABI_SUFFIX
 118 #endif
 119
 120 #endif
 121