ceph/src/boost/libs/range/include/boost/range/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_DIFFERENCE_TYPE_HPP
  12 #define BOOST_RANGE_DIFFERENCE_TYPE_HPP
  13
  14 #if defined(_MSC_VER)
  15 # pragma once
  16 #endif
  17
  18 #include <boost/mpl/and.hpp>
  19 #include <boost/range/config.hpp>
  20 #include <boost/range/iterator.hpp>
  21 #include <boost/range/has_range_iterator.hpp>
  22 #include <boost/iterator/iterator_traits.hpp>
  23 #include <boost/type_traits/remove_reference.hpp>
  24
  25 namespace boost
  26 {
  27     namespace range_detail
  28     {
  29         template< class T, bool B = has_type<range_iterator<T> >::value >
  30         struct range_difference
  31         { };
  32
  33         template< class T >
  34         struct range_difference<T, true>
  35           : iterator_difference<
  36                 BOOST_DEDUCED_TYPENAME range_iterator<T>::type
  37             >
  38         { };
  39     }
  40
  41     template< class T >
  42     struct range_difference
  43       : range_detail::range_difference<BOOST_DEDUCED_TYPENAME remove_reference<T>::type>
  44     { };
  45 }
  46
  47 #endif