| /*============================================================================= |
| Copyright (c) 2005 Joel de Guzman |
| Copyright (c) 2005 Eric Niebler |
| |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| ==============================================================================*/ |
| #if !defined(FUSION_CONS_ITERATOR_07172005_0849) |
| #define FUSION_CONS_ITERATOR_07172005_0849 |
| |
| #include <boost/type_traits/add_const.hpp> |
| #include <boost/fusion/support/iterator_base.hpp> |
| #include <boost/fusion/container/list/detail/deref_impl.hpp> |
| #include <boost/fusion/container/list/detail/next_impl.hpp> |
| #include <boost/fusion/container/list/detail/value_of_impl.hpp> |
| #include <boost/fusion/container/list/detail/equal_to_impl.hpp> |
| #include <boost/fusion/container/list/list_fwd.hpp> |
| |
| namespace boost { namespace fusion |
| { |
| struct nil; |
| struct cons_iterator_tag; |
| struct forward_traversal_tag; |
| |
| template <typename Cons> |
| struct cons_iterator_identity; |
| |
| template <typename Cons = nil> |
| struct cons_iterator : iterator_base<cons_iterator<Cons> > |
| { |
| typedef cons_iterator_tag fusion_tag; |
| typedef forward_traversal_tag category; |
| typedef Cons cons_type; |
| typedef cons_iterator_identity< |
| typename add_const<Cons>::type> |
| identity; |
| |
| explicit cons_iterator(cons_type& in_cons) |
| : cons(in_cons) {} |
| |
| cons_type& cons; |
| |
| private: |
| // silence MSVC warning C4512: assignment operator could not be generated |
| cons_iterator& operator= (cons_iterator const&); |
| }; |
| |
| struct nil_iterator : iterator_base<nil_iterator> |
| { |
| typedef forward_traversal_tag category; |
| typedef cons_iterator_tag fusion_tag; |
| typedef nil cons_type; |
| typedef cons_iterator_identity< |
| add_const<nil>::type> |
| identity; |
| nil_iterator() {} |
| explicit nil_iterator(nil const&) {} |
| }; |
| |
| template <> |
| struct cons_iterator<nil> : nil_iterator |
| { |
| cons_iterator() {} |
| explicit cons_iterator(nil const&) {} |
| }; |
| |
| template <> |
| struct cons_iterator<nil const> : nil_iterator |
| { |
| cons_iterator() {} |
| explicit cons_iterator(nil const&) {} |
| }; |
| |
| template <> |
| struct cons_iterator<list<> > : nil_iterator |
| { |
| cons_iterator() {} |
| explicit cons_iterator(nil const&) {} |
| }; |
| |
| template <> |
| struct cons_iterator<list<> const> : nil_iterator |
| { |
| cons_iterator() {} |
| explicit cons_iterator(nil const&) {} |
| }; |
| }} |
| |
| #endif |