Made dispatch::reverse able to find the tag by itself.

[SVN r81077]

include/boost/geometry/algorithms/reverse.hpp

@@ -32,9 +32,9 @@ namespace detail { namespace reverse
 {
 
 
-template <typename Range>
 struct range_reverse
 {
+    template <typename Range>
     static inline void apply(Range& range)
     {
         std::reverse(boost::begin(range), boost::end(range));
@@ -42,21 +42,20 @@ struct range_reverse
 };
 
 
-template <typename Polygon>
-struct polygon_reverse
+struct polygon_reverse: private range_reverse
 {
+    template <typename Polygon>
     static inline void apply(Polygon& polygon)
     {
         typedef typename geometry::ring_type<Polygon>::type ring_type;
 
-        typedef range_reverse<ring_type> per_range;
-        per_range::apply(exterior_ring(polygon));
+        range_reverse::apply(exterior_ring(polygon));
 
         typename interior_return_type<Polygon>::type rings
                     = interior_rings(polygon);
         for (BOOST_AUTO_TPL(it, boost::begin(rings)); it != boost::end(rings); ++it)
         {
-            per_range::apply(*it);
+            range_reverse::apply(*it);
         }
     }
 };
@@ -71,11 +70,7 @@ namespace dispatch
 {
 
 
-template
-<
-    typename Tag,
-    typename Geometry
->
+template <typename Geometry, typename Tag = typename tag<Geometry>::type>
 struct reverse
 {
     static inline void apply(Geometry&)
@@ -84,20 +79,20 @@ struct reverse
 
 
 template <typename Ring>
-struct reverse<ring_tag, Ring>
-    : detail::reverse::range_reverse<Ring>
+struct reverse<Ring, ring_tag>
+    : detail::reverse::range_reverse
 {};
 
 
 template <typename LineString>
-struct reverse<linestring_tag, LineString>
-    : detail::reverse::range_reverse<LineString>
+struct reverse<LineString, linestring_tag>
+    : detail::reverse::range_reverse
 {};
 
 
 template <typename Polygon>
-struct reverse<polygon_tag, Polygon>
-    : detail::reverse::polygon_reverse<Polygon>
+struct reverse<Polygon, polygon_tag>
+    : detail::reverse::polygon_reverse
 {};
 
 
@@ -121,11 +116,7 @@ inline void reverse(Geometry& geometry)
 {
     concept::check<Geometry>();
 
-    dispatch::reverse
-        <
-            typename tag<Geometry>::type,
-            Geometry
-        >::apply(geometry);
+    dispatch::reverse<Geometry>::apply(geometry);
 }
 
 }} // namespace boost::geometry

include/boost/geometry/multi/algorithms/reverse.hpp

@@ -34,27 +34,21 @@ namespace dispatch
 
 
 template <typename Geometry>
-struct reverse<multi_linestring_tag, Geometry>
+struct reverse<Geometry, multi_linestring_tag>
     : detail::multi_modify
         <
             Geometry,
             detail::reverse::range_reverse
-                <
-                    typename boost::range_value<Geometry>::type
-                >
         >
 {};
 
 
 template <typename Geometry>
-struct reverse<multi_polygon_tag, Geometry>
+struct reverse<Geometry, multi_polygon_tag>
     : detail::multi_modify
         <
             Geometry,
             detail::reverse::polygon_reverse
-                <
-                    typename boost::range_value<Geometry>::type
-                >
         >
 {};