Updated boost to v1.55.0

[rsem.git] / boost / fusion / view / joint_view / detail / next_impl.hpp

diff --git a/boost/fusion/view/joint_view/detail/next_impl.hpp b/boost/fusion/view/joint_view/detail/next_impl.hpp
new file mode 100644 (file)
index 0000000..47b4d48
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+++ b/boost/fusion/view/joint_view/detail/next_impl.hpp
@@ -0,0 +1,71 @@
+/*=============================================================================
+    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_NEXT_IMPL_07162005_0136)
+#define FUSION_NEXT_IMPL_07162005_0136
+
+#include <boost/fusion/iterator/next.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/mpl/if.hpp>
+
+namespace boost { namespace fusion
+{
+    struct joint_view_iterator_tag;
+
+    template <typename Category, typename First, typename Last, typename Concat>
+    struct joint_view_iterator;
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct next_impl;
+
+        template <>
+        struct next_impl<joint_view_iterator_tag>
+        {
+            template <typename Iterator>
+            struct apply
+            {
+                typedef typename Iterator::first_type first_type;
+                typedef typename Iterator::last_type last_type;
+                typedef typename Iterator::concat_type concat_type;
+                typedef typename Iterator::category category;
+                typedef typename result_of::next<first_type>::type next_type;
+                typedef result_of::equal_to<next_type, last_type> equal_to;
+
+                typedef typename
+                    mpl::if_<
+                        equal_to
+                      , concat_type
+                      , joint_view_iterator<category, next_type, last_type, concat_type>
+                    >::type
+                type;
+
+                static type
+                call(Iterator const& i, mpl::true_)
+                {
+                    return i.concat;
+                }
+
+                static type
+                call(Iterator const& i, mpl::false_)
+                {
+                    return type(fusion::next(i.first), i.concat);
+                }
+
+                static type
+                call(Iterator const& i)
+                {
+                    return call(i, equal_to());
+                }
+            };
+        };
+    }
+}}
+
+#endif
+
+