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+/*=============================================================================
+ Copyright (c) 2001-2011 Joel de Guzman
+
+ 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_MPL_ITERATOR_05052005_0731)
+#define FUSION_MPL_ITERATOR_05052005_0731
+
+#include <boost/fusion/support/detail/mpl_iterator_category.hpp>
+#include <boost/fusion/iterator/iterator_facade.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/mpl/deref.hpp>
+#include <boost/mpl/next.hpp>
+#include <boost/mpl/prior.hpp>
+#include <boost/mpl/advance.hpp>
+#include <boost/mpl/distance.hpp>
+
+namespace boost { namespace fusion
+{
+ template <typename Iterator_>
+ struct mpl_iterator
+ : iterator_facade<
+ mpl_iterator<Iterator_>
+ , typename detail::mpl_iterator_category<typename Iterator_::category>::type
+ >
+ {
+ typedef typename remove_const<Iterator_>::type iterator_type;
+
+ template <typename Iterator>
+ struct value_of : mpl::deref<typename Iterator::iterator_type> {};
+
+ template <typename Iterator>
+ struct deref
+ {
+ typedef typename mpl::deref<
+ typename Iterator::iterator_type>::type
+ type;
+
+ static type
+ call(Iterator)
+ {
+ return type();
+ }
+ };
+
+ template <typename Iterator>
+ struct next
+ {
+ typedef mpl_iterator<
+ typename mpl::next<typename Iterator::iterator_type>::type>
+ type;
+
+ static type
+ call(Iterator)
+ {
+ return type();
+ }
+ };
+
+ template <typename Iterator>
+ struct prior
+ {
+ typedef mpl_iterator<
+ typename mpl::prior<typename Iterator::iterator_type>::type>
+ type;
+
+ static type
+ call(Iterator)
+ {
+ return type();
+ }
+ };
+
+ template <typename Iterator, typename N>
+ struct advance
+ {
+ typedef mpl_iterator<
+ typename mpl::advance<typename Iterator::iterator_type, N>::type>
+ type;
+
+ static type
+ call(Iterator const& /*i*/)
+ {
+ return type();
+ }
+ };
+
+ template <typename I1, typename I2>
+ struct distance :
+ mpl::distance<
+ typename I1::iterator_type
+ , typename I2::iterator_type>
+ {
+ typedef typename
+ mpl::distance<
+ typename I1::iterator_type
+ , typename I2::iterator_type
+ >::type
+ type;
+
+ static type
+ call(I1 const&, I2 const&)
+ {
+ return type();
+ }
+ };
+ };
+}}
+
+#endif
+
+