git.sesse.net Git - casparcg/blob - dependencies/boost/boost/range/detail/difference_type.hpp

   1 // Boost.Range library
   2 //
   3 //  Copyright Thorsten Ottosen 2003-2004. Use, modification and
   4 //  distribution is subject to the Boost Software License, Version
   5 //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 //  http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 // For more information, see http://www.boost.org/libs/range/
   9 //
  10
  11 #ifndef BOOST_RANGE_DETAIL_DIFFERENCE_TYPE_HPP
  12 #define BOOST_RANGE_DETAIL_DIFFERENCE_TYPE_HPP
  13
  14 #include <boost/range/detail/common.hpp>
  15 #include <boost/iterator/iterator_traits.hpp>
  16
  17 //////////////////////////////////////////////////////////////////////////////
  18 // missing partial specialization  workaround.
  19 //////////////////////////////////////////////////////////////////////////////
  20
  21 namespace boost
  22 {
  23     namespace range_detail
  24     {
  25         template< typename T >
  26         struct range_difference_type_;
  27
  28         template<>
  29         struct range_difference_type_<std_container_>
  30         {
  31             template< typename C >
  32             struct pts
  33             {
  34                 typedef BOOST_DEDUCED_TYPENAME C::difference_type type;
  35             };
  36         };
  37
  38         template<>
  39         struct range_difference_type_<std_pair_>
  40         {
  41             template< typename P >
  42             struct pts
  43             {
  44                 typedef BOOST_RANGE_DEDUCED_TYPENAME boost::iterator_difference< BOOST_DEDUCED_TYPENAME P::first_type>::type type;
  45             };
  46         };
  47
  48         template<>
  49         struct range_difference_type_<array_>
  50         {
  51             template< typename A >
  52             struct pts
  53             {
  54                 typedef std::ptrdiff_t type;
  55             };
  56         };
  57
  58         template<>
  59         struct range_difference_type_<char_array_>
  60         {
  61             template< typename A >
  62             struct pts
  63             {
  64                 typedef std::ptrdiff_t type;
  65             };
  66         };
  67
  68         template<>
  69         struct range_difference_type_<char_ptr_>
  70         {
  71             template< typename S >
  72             struct pts
  73             {
  74                 typedef std::ptrdiff_t type;
  75             };
  76         };
  77
  78         template<>
  79         struct range_difference_type_<const_char_ptr_>
  80         {
  81             template< typename S >
  82             struct pts
  83             {
  84                 typedef std::ptrdiff_t type;
  85             };
  86         };
  87
  88         template<>
  89         struct range_difference_type_<wchar_t_ptr_>
  90         {
  91             template< typename S >
  92             struct pts
  93             {
  94                 typedef std::ptrdiff_t type;
  95             };
  96         };
  97
  98         template<>
  99         struct range_difference_type_<const_wchar_t_ptr_>
 100         {
 101             template< typename S >
 102             struct pts
 103             {
 104                 typedef std::ptrdiff_t type;
 105             };
 106         };
 107
 108     }
 109
 110     template< typename C >
 111     class range_difference
 112     {
 113         typedef BOOST_RANGE_DEDUCED_TYPENAME range_detail::range<C>::type c_type;
 114     public:
 115         typedef BOOST_RANGE_DEDUCED_TYPENAME range_detail::range_difference_type_<c_type>::BOOST_NESTED_TEMPLATE pts<C>::type type;
 116     };
 117
 118 }
 119
 120 #endif
 121