1 2 #ifndef BOOST_MPL_LIST_AUX_ITERATOR_HPP_INCLUDED 3 #define BOOST_MPL_LIST_AUX_ITERATOR_HPP_INCLUDED 4 5 // Copyright Aleksey Gurtovoy 2000-2004 6 // 7 // Distributed under the Boost Software License, Version 1.0. 8 // (See accompanying file LICENSE_1_0.txt or copy at 9 // http://www.boost.org/LICENSE_1_0.txt) 10 // 11 // See http://www.boost.org/libs/mpl for documentation. 12 13 // $Id$ 14 // $Date$ 15 // $Revision$ 16 17 #include <boost/mpl/iterator_tags.hpp> 18 #include <boost/mpl/next_prior.hpp> 19 #include <boost/mpl/deref.hpp> 20 #include <boost/mpl/list/aux_/item.hpp> 21 #include <boost/mpl/aux_/na.hpp> 22 #include <boost/mpl/aux_/lambda_spec.hpp> 23 #include <boost/mpl/aux_/config/ctps.hpp> 24 25 namespace boost { namespace mpl { 26 27 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) 28 29 template< typename Node > 30 struct l_iter 31 { 32 typedef aux::l_iter_tag tag; 33 typedef forward_iterator_tag category; 34 }; 35 36 template< typename Node > 37 struct deref< l_iter<Node> > 38 { 39 typedef typename Node::item type; 40 }; 41 42 template< typename Node > 43 struct next< l_iter<Node> > 44 { 45 typedef l_iter< typename Node::next > type; 46 }; 47 48 #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION 49 50 template< typename Node > 51 struct l_iter 52 { 53 typedef aux::l_iter_tag tag; 54 typedef forward_iterator_tag category; 55 typedef typename Node::item type; 56 typedef l_iter< typename mpl::next<Node>::type > next; 57 }; 58 59 #endif 60 61 62 template<> struct l_iter<l_end> 63 { 64 typedef aux::l_iter_tag tag; 65 typedef forward_iterator_tag category; 66 #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) 67 typedef na type; 68 typedef l_iter next; 69 #endif 70 }; 71 72 BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(1, l_iter) 73 74 }} 75 76 #endif // BOOST_MPL_LIST_AUX_ITERATOR_HPP_INCLUDED 77