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Diffstat (limited to 'boost/fusion/container/list/detail/next_impl.hpp')
| -rw-r--r-- | boost/fusion/container/list/detail/next_impl.hpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/boost/fusion/container/list/detail/next_impl.hpp b/boost/fusion/container/list/detail/next_impl.hpp new file mode 100644 index 0000000000..71006e5bb6 --- /dev/null +++ b/boost/fusion/container/list/detail/next_impl.hpp @@ -0,0 +1,59 @@ +/*============================================================================= + Copyright (c) 2001-2011 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_NEXT_IMPL_07172005_0836) +#define FUSION_NEXT_IMPL_07172005_0836 + +#include <boost/fusion/iterator/next.hpp> +#include <boost/fusion/iterator/equal_to.hpp> +#include <boost/mpl/eval_if.hpp> +#include <boost/mpl/identity.hpp> +#include <boost/type_traits/is_const.hpp> +#include <boost/type_traits/add_const.hpp> + +namespace boost { namespace fusion +{ + struct cons_iterator_tag; + + template <typename Cons> + struct cons_iterator; + + namespace extension + { + template <typename Tag> + struct next_impl; + + template <> + struct next_impl<cons_iterator_tag> + { + template <typename Iterator> + struct apply + { + typedef typename Iterator::cons_type cons_type; + typedef typename cons_type::cdr_type cdr_type; + + typedef cons_iterator< + typename mpl::eval_if< + is_const<cons_type> + , add_const<cdr_type> + , mpl::identity<cdr_type> + >::type> + type; + + static type + call(Iterator const& i) + { + return type(i.cons.cdr); + } + }; + }; + } +}} + +#endif + + |