Updated boost to v1.55.0

[rsem.git] / boost / fusion / view / single_view / detail / distance_impl.hpp

diff --git a/boost/fusion/view/single_view/detail/distance_impl.hpp b/boost/fusion/view/single_view/detail/distance_impl.hpp
new file mode 100644 (file)
index 0000000..fec204c
--- /dev/null
+++ b/boost/fusion/view/single_view/detail/distance_impl.hpp
@@ -0,0 +1,43 @@
+/*=============================================================================
+    Copyright (c) 2011 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(BOOST_FUSION_SINGLE_VIEW_DISTANCE_IMPL_JUL_07_2011_1348PM)
+#define BOOST_FUSION_SINGLE_VIEW_DISTANCE_IMPL_JUL_07_2011_1348PM
+
+#include <boost/mpl/minus.hpp>
+
+namespace boost { namespace fusion 
+{
+    struct single_view_iterator_tag;
+
+    namespace extension
+    {
+        template<typename Tag>
+        struct distance_impl;
+
+        template<>
+        struct distance_impl<single_view_iterator_tag>
+        {
+            template<typename First, typename Last>
+            struct apply
+              : mpl::minus<typename Last::position, typename First::position>
+            {
+                typedef typename mpl::minus<typename Last::position,
+                    typename First::position>::type type;
+
+                static type
+                call(First const& /*first*/, Last const& /*last*/)
+                {
+                    return type();
+                }
+            };
+        };
+    }
+
+}}
+
+#endif