boost/boost/indirect_reference.hpp

   1 // Copyright David Abrahams 2004. Use, modification and distribution is
   2 // subject to the Boost Software License, Version 1.0. (See accompanying
   3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   4 #ifndef INDIRECT_REFERENCE_DWA200415_HPP
   5 # define INDIRECT_REFERENCE_DWA200415_HPP
   6
   7 // dereferenceable_traits provides access to the value_type and
   8 // reference of a Dereferenceable type.
   9
  10 # include <boost/detail/is_incrementable.hpp>
  11 # include <boost/iterator/iterator_traits.hpp>
  12 # include <boost/type_traits/remove_cv.hpp>
  13 # include <boost/mpl/eval_if.hpp>
  14 # include <boost/pointee.hpp>
  15
  16 namespace boost {
  17
  18 namespace detail
  19 {
  20   template <class P>
  21   struct smart_ptr_reference
  22   {
  23       typedef typename boost::pointee<P>::type& type;
  24   };
  25 }
  26
  27 template <class P>
  28 struct indirect_reference
  29   : mpl::eval_if<
  30         detail::is_incrementable<P>
  31       , iterator_reference<P>
  32       , detail::smart_ptr_reference<P>
  33     >
  34 {
  35 };
  36
  37 } // namespace boost
  38
  39 #endif // INDIRECT_REFERENCE_DWA200415_HPP