[algorithms][detail][counting algorithms] move common functionality of

all counting algorithms in one place and in new namespace:
geometry::detail::counting

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

@@ -0,0 +1,122 @@
+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
+// Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland.
+
+// This file was modified by Oracle on 2014.
+// Modifications copyright (c) 2014, Oracle and/or its affiliates.
+
+// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
+
+// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
+// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
+
+// Use, modification and distribution is subject to 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)
+
+#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_COUNTING_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_COUNTING_HPP
+
+#include <cstddef>
+
+#include <boost/range.hpp>
+
+#include <boost/geometry/core/exterior_ring.hpp>
+#include <boost/geometry/core/interior_rings.hpp>
+
+#include <boost/geometry/util/range.hpp>
+
+#include <boost/geometry/algorithms/detail/interior_iterator.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace counting
+{
+
+
+template <std::size_t D>
+struct other_count
+{
+    template <typename Geometry>
+    static inline std::size_t apply(Geometry const&)
+    {
+        return D;
+    }
+
+    template <typename Geometry>
+    static inline std::size_t apply(Geometry const&, bool)
+    {
+        return D;
+    }
+};
+
+
+template <typename RangeCount>
+struct polygon_count
+{
+    template <typename Polygon>
+    static inline std::size_t apply(Polygon const& poly, bool add_for_open)
+    {
+        std::size_t n = RangeCount::apply(exterior_ring(poly), add_for_open);
+
+        typename interior_return_type<Polygon const>::type
+            rings = interior_rings(poly);
+        for (typename detail::interior_iterator<Polygon const>::type
+                it = boost::begin(rings); it != boost::end(rings); ++it)
+        {
+            n += RangeCount::apply(*it, add_for_open);
+        }
+
+        return n;
+    }
+};
+
+
+template <typename SingleCount>
+struct multi_count
+{
+    template <typename MultiGeometry>
+    static inline std::size_t apply(MultiGeometry const& geometry)
+    {
+        std::size_t n = 0;
+        for (typename boost::range_iterator<MultiGeometry const>::type
+                 it = boost::begin(geometry);
+             it != boost::end(geometry);
+             ++it)
+        {
+            n += SingleCount::apply(*it);
+        }
+        return n;
+    }
+
+    template <typename MultiGeometry>
+    static inline
+    std::size_t apply(MultiGeometry const& geometry, bool add_for_open)
+    {
+        std::size_t n = 0;
+        for (typename boost::range_iterator<MultiGeometry const>::type
+                 it = boost::begin(geometry);
+             it != boost::end(geometry);
+             ++it)
+        {
+            n += SingleCount::apply(*it, add_for_open);
+        }
+        return n;
+    }
+};
+
+
+}} // namespace detail::counting
+#endif // DOXYGEN_NO_DETAIL
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_COUNTING_HPP