[distance] add helper classes for choosing default strategies

2026-02-10 23:42:12 +00:00 · 2014-05-08 14:49:01 +03:00
parent 17d3f0e78e
commit ad2fbc9e5b
1 changed files with 131 additions and 0 deletions
--- a/include/boost/geometry/algorithms/detail/distance/default_strategies.hpp
+++ b/include/boost/geometry/algorithms/detail/distance/default_strategies.hpp
@@ -0,0 +1,131 @@
+// 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) 2013-2014 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_DISTANCE_DEFAULT_STRATEGIES_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_DISTANCE_DEFAULT_STRATEGIES_HPP
+
+#include <boost/geometry/core/cs.hpp>
+#include <boost/geometry/core/tag.hpp>
+#include <boost/geometry/core/tag_cast.hpp>
+#include <boost/geometry/core/tags.hpp>
+#include <boost/geometry/core/point_type.hpp>
+
+#include <boost/geometry/strategies/distance.hpp>
+
+#include <boost/mpl/if.hpp>
+#include <boost/type_traits/is_same.hpp>
+
+namespace boost { namespace geometry
+{
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace distance
+{
+
+
+
+// Helper metafunction for default strategy retrieval
+template
+<
+    typename Geometry1,
+    typename Geometry2,
+    typename Tag1 = typename tag_cast
+        <
+            typename tag<Geometry1>::type, pointlike_tag
+        >::type,
+    typename Tag2 = typename tag_cast
+        <
+            typename tag<Geometry2>::type, pointlike_tag
+        >::type
+>
+struct default_strategy
+    : strategy::distance::services::default_strategy
+          <
+              segment_tag,
+              typename point_type<Geometry1>::type,
+              typename point_type<Geometry2>::type
+          >
+{};
+
+
+template <typename Pointlike1, typename Pointlike2>
+struct default_strategy<Pointlike1, Pointlike2, pointlike_tag, pointlike_tag>
+    : strategy::distance::services::default_strategy
+          <
+              point_tag,
+              typename point_type<Pointlike1>::type,
+              typename point_type<Pointlike2>::type
+          >
+{};
+
+
+template <typename Pointlike, typename Box>
+struct default_strategy<Pointlike, Box, pointlike_tag, box_tag>
+    : strategy::distance::services::default_strategy
+          <
+              point_tag,
+              typename point_type<Pointlike>::type,
+              typename point_type<Box>::type,
+              cartesian_tag,
+              cartesian_tag,
+              void,
+              box_tag
+          >
+{};
+
+
+template <typename Box1, typename Box2>
+struct default_strategy<Box1, Box2, box_tag, box_tag>
+    : strategy::distance::services::default_strategy
+          <
+              box_tag,
+              typename point_type<Box1>::type,
+              typename point_type<Box2>::type,
+              cartesian_tag,
+              cartesian_tag,
+              void,
+              box_tag
+          >
+{};
+
+
+
+// Helper metafunction for default point-segment strategy retrieval
+template <typename Geometry1, typename Geometry2, typename Strategy>
+struct default_ps_strategy
+    : strategy::distance::services::default_strategy
+          <
+              segment_tag,
+              typename point_type<Geometry1>::type,
+              typename point_type<Geometry2>::type,
+              typename cs_tag<typename point_type<Geometry1>::type>::type,
+              typename cs_tag<typename point_type<Geometry2>::type>::type,
+              Strategy
+          >
+{};
+
+
+
+}} // namespace detail::distance
+#endif // DOXYGEN_NO_DETAIL
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_DISTANCE_DEFAULT_STRATEGIES_HPP