diff --git a/doc/src/docutils/tools/support_status/support_status.cpp b/doc/src/docutils/tools/support_status/support_status.cpp
index df14199fa..7255dee89 100644
--- a/doc/src/docutils/tools/support_status/support_status.cpp
+++ b/doc/src/docutils/tools/support_status/support_status.cpp
@@ -47,17 +47,11 @@ struct check_distance
 {};
 
 template <typename G1, typename G2>
-struct check_convert
-  : boost::geometry::dispatch::convert<
-        typename boost::geometry::tag_cast<typename boost::geometry::tag<G1>::type, boost::geometry::multi_tag>::type,
-        typename boost::geometry::tag_cast<typename boost::geometry::tag<G2>::type, boost::geometry::multi_tag>::type,
-        G1,
-        G2
-    >
+struct check_convert: boost::geometry::dispatch::convert<G1, G2>
 {};
 
 
-template <class T1>
+template <typename T1>
 struct distance_tester
 {
     template <typename T2>
@@ -90,7 +84,7 @@ struct distance_tester<void>
 };
 
 
-template <class T1>
+template <typename T1>
 struct convert_tester
 {
     template <typename T2>
diff --git a/include/boost/geometry/algorithms/assign.hpp b/include/boost/geometry/algorithms/assign.hpp
index 411e4db83..23b175a22 100644
--- a/include/boost/geometry/algorithms/assign.hpp
+++ b/include/boost/geometry/algorithms/assign.hpp
@@ -163,13 +163,7 @@ inline void assign(Geometry1& geometry1, Geometry2 const& geometry2)
             , (types<Geometry1, Geometry2>)
         );
 
-    dispatch::convert
-        <
-            typename tag<Geometry2>::type,
-            typename tag<Geometry1>::type,
-            Geometry2,
-            Geometry1
-        >::apply(geometry2, geometry1);
+    dispatch::convert<Geometry2, Geometry1>::apply(geometry2, geometry1);
 }
 
 
diff --git a/include/boost/geometry/algorithms/convert.hpp b/include/boost/geometry/algorithms/convert.hpp
index 526dc9c9f..9b4c360a1 100644
--- a/include/boost/geometry/algorithms/convert.hpp
+++ b/include/boost/geometry/algorithms/convert.hpp
@@ -214,8 +214,9 @@ namespace dispatch
 
 template
 <
-    typename Tag1, typename Tag2,
     typename Geometry1, typename Geometry2,
+    typename Tag1 = typename tag_cast<typename tag<Geometry1>::type, multi_tag>::type,
+    typename Tag2 = typename tag_cast<typename tag<Geometry2>::type, multi_tag>::type,
     std::size_t DimensionCount = dimension<Geometry1>::type::value,
     bool UseAssignment = boost::is_same<Geometry1, Geometry2>::value
                          && !boost::is_array<Geometry1>::value
@@ -228,11 +229,11 @@ struct convert: boost::geometry::not_implemented<for_geometry<Tag1>,
 
 template
 <
-    typename Tag,
     typename Geometry1, typename Geometry2,
+    typename Tag,
     std::size_t DimensionCount
 >
-struct convert<Tag, Tag, Geometry1, Geometry2, DimensionCount, true>
+struct convert<Geometry1, Geometry2, Tag, Tag, DimensionCount, true>
 {
     // Same geometry type -> copy whole geometry
     static inline void apply(Geometry1 const& source, Geometry2& destination)
@@ -247,7 +248,7 @@ template
     typename Geometry1, typename Geometry2,
     std::size_t DimensionCount
 >
-struct convert<point_tag, point_tag, Geometry1, Geometry2, DimensionCount, false>
+struct convert<Geometry1, Geometry2, point_tag, point_tag, DimensionCount, false>
     : detail::conversion::point_to_point<Geometry1, Geometry2, 0, DimensionCount>
 {};
 
@@ -257,7 +258,7 @@ template
     typename Box1, typename Box2,
     std::size_t DimensionCount
 >
-struct convert<box_tag, box_tag, Box1, Box2, DimensionCount, false>
+struct convert<Box1, Box2, box_tag, box_tag, DimensionCount, false>
     : detail::conversion::indexed_to_indexed<Box1, Box2, 0, DimensionCount>
 {};
 
@@ -267,19 +268,19 @@ template
     typename Segment1, typename Segment2,
     std::size_t DimensionCount
 >
-struct convert<segment_tag, segment_tag, Segment1, Segment2, DimensionCount, false>
+struct convert<Segment1, Segment2, segment_tag, segment_tag, DimensionCount, false>
     : detail::conversion::indexed_to_indexed<Segment1, Segment2, 0, DimensionCount>
 {};
 
 
 template <typename Segment, typename LineString, std::size_t DimensionCount>
-struct convert<segment_tag, linestring_tag, Segment, LineString, DimensionCount, false>
+struct convert<Segment, LineString, segment_tag, linestring_tag, DimensionCount, false>
     : detail::conversion::segment_to_range<Segment, LineString>
 {};
 
 
 template <typename Ring1, typename Ring2, std::size_t DimensionCount>
-struct convert<ring_tag, ring_tag, Ring1, Ring2, DimensionCount, false>
+struct convert<Ring1, Ring2, ring_tag, ring_tag, DimensionCount, false>
     : detail::conversion::range_to_range
         <   
             Ring1, 
@@ -290,17 +291,17 @@ struct convert<ring_tag, ring_tag, Ring1, Ring2, DimensionCount, false>
 {};
 
 template <typename LineString1, typename LineString2, std::size_t DimensionCount>
-struct convert<linestring_tag, linestring_tag, LineString1, LineString2, DimensionCount, false>
+struct convert<LineString1, LineString2, linestring_tag, linestring_tag, DimensionCount, false>
     : detail::conversion::range_to_range<LineString1, LineString2>
 {};
 
 template <typename Polygon1, typename Polygon2, std::size_t DimensionCount>
-struct convert<polygon_tag, polygon_tag, Polygon1, Polygon2, DimensionCount, false>
+struct convert<Polygon1, Polygon2, polygon_tag, polygon_tag, DimensionCount, false>
     : detail::conversion::polygon_to_polygon<Polygon1, Polygon2>
 {};
 
 template <typename Box, typename Ring>
-struct convert<box_tag, ring_tag, Box, Ring, 2, false>
+struct convert<Box, Ring, box_tag, ring_tag, 2, false>
     : detail::conversion::box_to_range
         <
             Box, 
@@ -312,7 +313,7 @@ struct convert<box_tag, ring_tag, Box, Ring, 2, false>
 
 
 template <typename Box, typename Polygon>
-struct convert<box_tag, polygon_tag, Box, Polygon, 2, false>
+struct convert<Box, Polygon, box_tag, polygon_tag, 2, false>
 {
     static inline void apply(Box const& box, Polygon& polygon)
     {
@@ -320,8 +321,8 @@ struct convert<box_tag, polygon_tag, Box, Polygon, 2, false>
 
         convert
             <
-                box_tag, ring_tag,
                 Box, ring_type,
+                box_tag, ring_tag,
                 2, false
             >::apply(box, exterior_ring(polygon));
     }
@@ -329,7 +330,7 @@ struct convert<box_tag, polygon_tag, Box, Polygon, 2, false>
 
 
 template <typename Point, typename Box, std::size_t DimensionCount>
-struct convert<point_tag, box_tag, Point, Box, DimensionCount, false>
+struct convert<Point, Box, point_tag, box_tag, DimensionCount, false>
 {
     static inline void apply(Point const& point, Box& box)
     {
@@ -346,15 +347,15 @@ struct convert<point_tag, box_tag, Point, Box, DimensionCount, false>
 
 
 template <typename Ring, typename Polygon, std::size_t DimensionCount>
-struct convert<ring_tag, polygon_tag, Ring, Polygon, DimensionCount, false>
+struct convert<Ring, Polygon, ring_tag, polygon_tag, DimensionCount, false>
 {
     static inline void apply(Ring const& ring, Polygon& polygon)
     {
         typedef typename ring_type<Polygon>::type ring_type;
         convert
             <
-                ring_tag, ring_tag,
                 Ring, ring_type,
+                ring_tag, ring_tag,
                 DimensionCount, false
             >::apply(ring, exterior_ring(polygon));
     }
@@ -362,7 +363,7 @@ struct convert<ring_tag, polygon_tag, Ring, Polygon, DimensionCount, false>
 
 
 template <typename Polygon, typename Ring, std::size_t DimensionCount>
-struct convert<polygon_tag, ring_tag, Polygon, Ring, DimensionCount, false>
+struct convert<Polygon, Ring, polygon_tag, ring_tag, DimensionCount, false>
 {
     static inline void apply(Polygon const& polygon, Ring& ring)
     {
@@ -370,8 +371,8 @@ struct convert<polygon_tag, ring_tag, Polygon, Ring, DimensionCount, false>
 
         convert
             <
-                ring_tag, ring_tag,
                 ring_type, Ring,
+                ring_tag, ring_tag,
                 DimensionCount, false
             >::apply(exterior_ring(polygon), ring);
     }
@@ -402,13 +403,7 @@ inline void convert(Geometry1 const& geometry1, Geometry2& geometry2)
 {
     concept::check_concepts_and_equal_dimensions<Geometry1 const, Geometry2>();
 
-    dispatch::convert
-        <
-            typename tag_cast<typename tag<Geometry1>::type, multi_tag>::type,
-            typename tag_cast<typename tag<Geometry2>::type, multi_tag>::type,
-            Geometry1,
-            Geometry2
-        >::apply(geometry1, geometry2);
+    dispatch::convert<Geometry1, Geometry2>::apply(geometry1, geometry2);
 }
 
 
diff --git a/include/boost/geometry/multi/algorithms/convert.hpp b/include/boost/geometry/multi/algorithms/convert.hpp
index 6a37d04ce..ebd58dedd 100644
--- a/include/boost/geometry/multi/algorithms/convert.hpp
+++ b/include/boost/geometry/multi/algorithms/convert.hpp
@@ -74,13 +74,15 @@ namespace dispatch
 // version types might be the same and therefore we call boost::is_same again
 
 template <typename Multi1, typename Multi2, std::size_t DimensionCount>
-struct convert<multi_tag, multi_tag, Multi1, Multi2, DimensionCount, false>
+struct convert<Multi1, Multi2, multi_tag, multi_tag, DimensionCount, false>
     : detail::conversion::multi_to_multi
         <
             Multi1, 
             Multi2,
             convert
                 <
+                    typename boost::range_value<Multi1>::type,
+                    typename boost::range_value<Multi2>::type,
                     typename single_tag_of
                                 <
                                     typename tag<Multi1>::type
@@ -89,28 +91,26 @@ struct convert<multi_tag, multi_tag, Multi1, Multi2, DimensionCount, false>
                                 <
                                     typename tag<Multi2>::type
                                 >::type,
-                    typename boost::range_value<Multi1>::type,
-                    typename boost::range_value<Multi2>::type,
                     DimensionCount
                 >
         >
 {};
 
-template <typename SingleTag, typename Single, typename Multi, std::size_t DimensionCount>
-struct convert<SingleTag, multi_tag, Single, Multi, DimensionCount, false>
+template <typename Single, typename Multi, typename SingleTag, std::size_t DimensionCount>
+struct convert<Single, Multi, SingleTag, multi_tag, DimensionCount, false>
     : detail::conversion::single_to_multi
         <
             Single, 
             Multi,
             convert
                 <
+                    Single,
+                    typename boost::range_value<Multi>::type,
                     typename tag<Single>::type,
                     typename single_tag_of
                                 <
                                     typename tag<Multi>::type
                                 >::type,
-                    Single,
-                    typename boost::range_value<Multi>::type,
                     DimensionCount,
                     false
                 >