boost/indirect_reference.hpp

   1 #ifndef INDIRECT_REFERENCE_DWA200415_HPP
   2 # define INDIRECT_REFERENCE_DWA200415_HPP
   3
   4 //
   5 // Copyright David Abrahams 2004. Use, modification and distribution is
   6 // subject to the Boost Software License, Version 1.0. (See accompanying
   7 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9 // typename indirect_reference<P>::type provides the type of *p.
  10 //
  11 // http://www.boost.org/libs/iterator/doc/pointee.html
  12 //
  13
  14 # include <boost/detail/is_incrementable.hpp>
  15 # include <boost/iterator/iterator_traits.hpp>
  16 # include <boost/type_traits/remove_cv.hpp>
  17 # include <boost/mpl/eval_if.hpp>
  18 # include <boost/pointee.hpp>
  19
  20 namespace boost {
  21
  22 namespace detail
  23 {
  24   template <class P>
  25   struct smart_ptr_reference
  26   {
  27       typedef typename boost::pointee<P>::type& type;
  28   };
  29 }
  30
  31 template <class P>
  32 struct indirect_reference
  33   : mpl::eval_if<
  34         detail::is_incrementable<P>
  35       , iterator_reference<P>
  36       , detail::smart_ptr_reference<P>
  37     >
  38 {
  39 };
  40
  41 } // namespace boost
  42
  43 #endif // INDIRECT_REFERENCE_DWA200415_HPP