Chris@16: // Boost.Range library
Chris@16: //
Chris@16: //  Copyright Neil Groves 2010. Use, modification and
Chris@16: //  distribution is subject to the Boost Software License, Version
Chris@16: //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // For more information, see http://www.boost.org/libs/range/
Chris@16: //
Chris@101: // Acknowledgments:
Chris@101: // Ticket #8341: Arno Schoedl - improved handling of has_range_iterator upon
Chris@101: // use-cases where T was const.
Chris@16: #ifndef BOOST_RANGE_HAS_ITERATOR_HPP_INCLUDED
Chris@16: #define BOOST_RANGE_HAS_ITERATOR_HPP_INCLUDED
Chris@16: 
Chris@16: #include <boost/mpl/bool.hpp>
Chris@101: #include <boost/mpl/eval_if.hpp>
Chris@16: #include <boost/mpl/has_xxx.hpp>
Chris@16: #include <boost/range/iterator.hpp>
Chris@101: #include <boost/type_traits/remove_reference.hpp>
Chris@16: #include <boost/utility/enable_if.hpp>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:     namespace range_detail
Chris@16:     {
Chris@16:         BOOST_MPL_HAS_XXX_TRAIT_DEF(type)
Chris@16: 
Chris@16:         template<class T, class Enabler = void>
Chris@16:         struct has_range_iterator_impl
Chris@16:             : boost::mpl::false_
Chris@16:         {
Chris@16:         };
Chris@16: 
Chris@16:         template<class T>
Chris@101:         struct has_range_iterator_impl<
Chris@101:             T,
Chris@101:             BOOST_DEDUCED_TYPENAME ::boost::enable_if<
Chris@101:                 BOOST_DEDUCED_TYPENAME mpl::eval_if<is_const<T>,
Chris@101:                     has_type<range_const_iterator<
Chris@101:                                 BOOST_DEDUCED_TYPENAME remove_const<T>::type> >,
Chris@101:                     has_type<range_mutable_iterator<T> >
Chris@101:                 >::type
Chris@101:             >::type
Chris@101:         >
Chris@16:             : boost::mpl::true_
Chris@16:         {
Chris@16:         };
Chris@16: 
Chris@16:         template<class T, class Enabler = void>
Chris@16:         struct has_range_const_iterator_impl
Chris@16:             : boost::mpl::false_
Chris@16:         {
Chris@16:         };
Chris@16: 
Chris@16:         template<class T>
Chris@101:         struct has_range_const_iterator_impl<
Chris@101:             T,
Chris@101:             BOOST_DEDUCED_TYPENAME ::boost::enable_if<
Chris@101:                 has_type<range_const_iterator<T> >
Chris@101:             >::type
Chris@101:         >
Chris@16:             : boost::mpl::true_
Chris@16:         {
Chris@16:         };
Chris@16: 
Chris@16:     } // namespace range_detail
Chris@16: 
Chris@16:     template<class T>
Chris@16:     struct has_range_iterator
Chris@101:         : range_detail::has_range_iterator_impl<
Chris@101:             BOOST_DEDUCED_TYPENAME remove_reference<T>::type>
Chris@16:     {};
Chris@16: 
Chris@16:     template<class T>
Chris@16:     struct has_range_const_iterator
Chris@101:         : range_detail::has_range_const_iterator_impl<
Chris@101:             BOOST_DEDUCED_TYPENAME remove_reference<T>::type>
Chris@16:     {};
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // include guard
Chris@16: