ceph/src/boost/libs/range/include/boost/range/detail/value_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_VALUE_TYPE_HPP
  12 #define BOOST_RANGE_DETAIL_VALUE_TYPE_HPP
  13
  14 #include <boost/range/detail/common.hpp>
  15 #include <boost/range/detail/remove_extent.hpp>
  16 #include <boost/iterator/iterator_traits.hpp>
  17
  18 //////////////////////////////////////////////////////////////////////////////
  19 // missing partial specialization  workaround.
  20 //////////////////////////////////////////////////////////////////////////////
  21
  22 namespace boost
  23 {
  24     namespace range_detail
  25     {
  26         template< typename T >
  27         struct range_value_type_;
  28
  29         template<>
  30         struct range_value_type_<std_container_>
  31         {
  32             template< typename C >
  33             struct pts
  34             {
  35                 typedef BOOST_RANGE_DEDUCED_TYPENAME C::value_type type;
  36             };
  37         };
  38
  39         template<>
  40         struct range_value_type_<std_pair_>
  41         {
  42             template< typename P >
  43             struct pts
  44             {
  45                 typedef BOOST_RANGE_DEDUCED_TYPENAME boost::iterator_value< BOOST_RANGE_DEDUCED_TYPENAME P::first_type >::type type;
  46             };
  47         };
  48
  49         template<>
  50         struct range_value_type_<array_>
  51         {
  52             template< typename T >
  53             struct pts
  54             {
  55                 typedef BOOST_DEDUCED_TYPENAME remove_extent<T>::type type;
  56             };
  57         };
  58
  59     }
  60
  61     template< typename C >
  62     class range_value
  63     {
  64         typedef BOOST_DEDUCED_TYPENAME range_detail::range<C>::type c_type;
  65     public:
  66         typedef BOOST_DEDUCED_TYPENAME range_detail::range_value_type_<c_type>::BOOST_NESTED_TEMPLATE pts<C>::type type;
  67     };
  68
  69 }
  70
  71 #endif
  72