/Src/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
 21namespace 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