Updated boost to v1.55.0

[rsem.git] / boost / fusion / container / list / detail / next_impl.hpp

diff --git a/boost/fusion/container/list/detail/next_impl.hpp b/boost/fusion/container/list/detail/next_impl.hpp
new file mode 100644 (file)
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+++ 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
+
+