[util] replace is_base_of by is_multi where applicable

include/boost/geometry/algorithms/detail/relate/follow_helpers.hpp

@@ -30,6 +30,7 @@
 
 #include <boost/geometry/util/condition.hpp>
 #include <boost/geometry/util/range.hpp>
+#include <boost/geometry/util/type_traits.hpp>
 
 #include <type_traits>
 
@@ -42,10 +43,12 @@ namespace detail { namespace relate {
 // NOTE: This iterates through single geometries for which turns were not generated.
 //       It doesn't mean that the geometry is disjoint, only that no turns were detected.
 
-template <std::size_t OpId,
+template
+<
+    std::size_t OpId,
     typename Geometry,
     typename Tag = typename geometry::tag<Geometry>::type,
-          bool IsMulti = std::is_base_of<multi_tag, Tag>::value
+    bool IsMulti = util::is_multi<Geometry>::value
 >
 struct for_each_disjoint_geometry_if
     : public not_implemented<Tag>

include/boost/geometry/algorithms/detail/single_geometry.hpp

@@ -18,6 +18,7 @@
 #include <boost/geometry/core/assert.hpp>
 #include <boost/geometry/core/tag.hpp>
 #include <boost/geometry/util/range.hpp>
+#include <boost/geometry/util/type_traits.hpp>
 
 namespace boost { namespace geometry {
 
@@ -29,11 +30,7 @@ namespace detail_dispatch {
 template
 <
     typename Geometry,
-    bool IsMulti = std::is_base_of
+    bool IsMulti = util::is_multi<Geometry>::value
-                    <
-                        multi_tag,
-                        typename geometry::tag<Geometry>::type
-                    >::value
 >
 struct single_geometry
 {

include/boost/geometry/algorithms/detail/sub_range.hpp

@@ -25,6 +25,7 @@
 #include <boost/geometry/core/tags.hpp>
 
 #include <boost/geometry/util/range.hpp>
+#include <boost/geometry/util/type_traits.hpp>
 
 namespace boost { namespace geometry {
 
@@ -33,9 +34,12 @@ namespace boost { namespace geometry {
 #ifndef DOXYGEN_NO_DISPATCH
 namespace detail_dispatch {
 
-template <typename Geometry,
+template
+<
+    typename Geometry,
     typename Tag = typename geometry::tag<Geometry>::type,
-          bool IsMulti = std::is_base_of<multi_tag, Tag>::value>
+    bool IsMulti = util::is_multi<Geometry>::value
+>
 struct sub_range : not_implemented<Tag>
 {};
 

include/boost/geometry/algorithms/detail/within/within_no_turns.hpp

@@ -19,10 +19,9 @@
 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_WITHIN_WITHIN_NO_TURNS_HPP
 
 
-#include <type_traits>
-
 #include <boost/geometry/algorithms/detail/point_on_border.hpp>
 #include <boost/geometry/algorithms/detail/within/point_in_geometry.hpp>
+#include <boost/geometry/util/type_traits.hpp>
 
 namespace boost { namespace geometry {
 
@@ -145,8 +144,8 @@ template <typename Geometry1,
           typename Geometry2,
           typename Tag1 = typename geometry::tag<Geometry1>::type,
           typename Tag2 = typename geometry::tag<Geometry2>::type,
-          bool IsMulti1 = std::is_base_of<geometry::multi_tag, Tag1>::value,
+          bool IsMulti1 = util::is_multi<Geometry1>::value,
-          bool IsMulti2 = std::is_base_of<geometry::multi_tag, Tag2>::value>
+          bool IsMulti2 = util::is_multi<Geometry2>::value>
 struct within_no_turns_multi
 {
     template <typename Strategy> static inline

include/boost/geometry/util/numeric_cast.hpp

@@ -12,7 +12,8 @@
 #include <boost/numeric/conversion/cast.hpp>
 #include <boost/rational.hpp>
 
-namespace boost { namespace geometry
+namespace boost { namespace geometry { namespace util
+
 {
 
 #ifndef DOXYGEN_NO_DETAIL
@@ -42,9 +43,6 @@ struct numeric_caster<Target, rational<T>>
 } // namespace detail
 #endif
 
-namespace util
-{
-
 // Calls either boost::numeric_cast, or functionality specific for Boost.Geometry
 // such as rational_cast for Boost.Rational
 template <typename Target, typename Source>
@@ -53,8 +51,6 @@ inline Target numeric_cast(Source const& source)
     return detail::numeric_caster<Target, Source>::apply(source);
 }
 
-}
+}}} // namespace boost::geometry::util
-
-}} // namespace boost::geometry
 
 #endif // BOOST_GEOMETRY_UTIL_NUMERIC_CAST_HPP