Chris@16: #ifndef POINTEE_DWA200415_HPP
Chris@16: # define POINTEE_DWA200415_HPP
Chris@16: 
Chris@16: //
Chris@16: // Copyright David Abrahams 2004. Use, modification and distribution is
Chris@16: // subject to the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // typename pointee<P>::type provides the pointee type of P.
Chris@16: //
Chris@16: // For example, it is T for T* and X for shared_ptr<X>.
Chris@16: //
Chris@16: // http://www.boost.org/libs/iterator/doc/pointee.html
Chris@16: //
Chris@16: 
Chris@16: # include <boost/detail/is_incrementable.hpp>
Chris@16: # include <boost/iterator/iterator_traits.hpp>
Chris@16: # include <boost/type_traits/add_const.hpp>
Chris@16: # include <boost/type_traits/remove_cv.hpp>
Chris@16: # include <boost/mpl/if.hpp>
Chris@16: # include <boost/mpl/eval_if.hpp>
Chris@16: 
Chris@101: namespace boost {
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16:   template <class P>
Chris@16:   struct smart_ptr_pointee
Chris@16:   {
Chris@16:       typedef typename P::element_type type;
Chris@16:   };
Chris@16: 
Chris@16:   template <class Iterator>
Chris@16:   struct iterator_pointee
Chris@16:   {
Chris@16:       typedef typename iterator_traits<Iterator>::value_type value_type;
Chris@101: 
Chris@16:       struct impl
Chris@16:       {
Chris@16:           template <class T>
Chris@16:           static char test(T const&);
Chris@101: 
Chris@16:           static char (& test(value_type&) )[2];
Chris@101: 
Chris@16:           static Iterator& x;
Chris@16:       };
Chris@101: 
Chris@16:       BOOST_STATIC_CONSTANT(bool, is_constant = sizeof(impl::test(*impl::x)) == 1);
Chris@101: 
Chris@16:       typedef typename mpl::if_c<
Chris@16: #  if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
Chris@16:           ::boost::detail::iterator_pointee<Iterator>::is_constant
Chris@16: #  else
Chris@16:           is_constant
Chris@101: #  endif
Chris@16:         , typename add_const<value_type>::type
Chris@16:         , value_type
Chris@16:       >::type type;
Chris@16:   };
Chris@16: }
Chris@16: 
Chris@16: template <class P>
Chris@16: struct pointee
Chris@16:   : mpl::eval_if<
Chris@16:         detail::is_incrementable<P>
Chris@16:       , detail::iterator_pointee<P>
Chris@16:       , detail::smart_ptr_pointee<P>
Chris@16:     >
Chris@16: {
Chris@16: };
Chris@101: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // POINTEE_DWA200415_HPP