1 /*============================================================================= 2 Copyright (c) 2009 Christopher Schmidt 3 4 Distributed under the Boost Software License, Version 1.0. (See accompanying 5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 ==============================================================================*/ 7 8 #ifndef BOOST_FUSION_CONTAINER_SET_DETAIL_DEREF_IMPL_HPP 9 #define BOOST_FUSION_CONTAINER_SET_DETAIL_DEREF_IMPL_HPP 10 11 #include <boost/fusion/support/config.hpp> 12 #include <boost/fusion/sequence/intrinsic/at.hpp> 13 #include <boost/type_traits/is_const.hpp> 14 15 namespace boost { namespace fusion { namespace extension 16 { 17 template <typename> 18 struct deref_impl; 19 20 template <> 21 struct deref_impl<set_iterator_tag> 22 { 23 template <typename It> 24 struct apply 25 { 26 typedef typename 27 result_of::at< 28 typename mpl::if_< 29 is_const<typename It::seq_type> 30 , typename It::seq_type::storage_type const 31 , typename It::seq_type::storage_type 32 >::type 33 , typename It::index 34 >::type 35 type; 36 37 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED 38 static type callboost::fusion::extension::deref_impl::apply39 call(It const& it) 40 { 41 return ::boost::fusion::at<typename It::index>(it.seq->get_data()); 42 } 43 }; 44 }; 45 }}} 46 47 #endif 48