ceph/src/boost/boost/geometry/index/detail/rtree/node/weak_visitor.hpp

   1 // Boost.Geometry Index
   2 //
   3 // R-tree nodes weak visitor and nodes base type
   4 //
   5 // Copyright (c) 2011-2014 Adam Wulkiewicz, Lodz, Poland.
   6 //
   7 // Use, modification and distribution is subject to the Boost Software License,
   8 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_GEOMETRY_INDEX_DETAIL_RTREE_NODE_WEAK_VISITOR_HPP
  12 #define BOOST_GEOMETRY_INDEX_DETAIL_RTREE_NODE_WEAK_VISITOR_HPP
  13
  14 namespace boost { namespace geometry { namespace index {
  15
  16 namespace detail { namespace rtree {
  17
  18 // empty visitor
  19 template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag, bool IsVisitableConst>
  20 struct weak_visitor {};
  21
  22 // node
  23
  24 template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
  25 struct weak_node {};
  26
  27 // nodes variants forward declarations
  28
  29 template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
  30 struct weak_internal_node;
  31
  32 template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
  33 struct weak_leaf;
  34
  35 // nodes conversion
  36
  37 template <typename Derived, typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
  38 inline Derived & get(weak_node<Value, Parameters, Box, Allocators, Tag> & n)
  39 {
  40     return static_cast<Derived&>(n);
  41 }
  42
  43 // apply visitor
  44
  45 template <typename Visitor, typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
  46 inline void apply_visitor(Visitor & v,
  47                           weak_node<Value, Parameters, Box, Allocators, Tag> & n,
  48                           bool is_internal_node)
  49 {
  50     BOOST_GEOMETRY_INDEX_ASSERT(&n, "null ptr");
  51     if ( is_internal_node )
  52     {
  53         typedef weak_internal_node<Value, Parameters, Box, Allocators, Tag> internal_node;
  54         v(get<internal_node>(n));
  55     }
  56     else
  57     {
  58         typedef weak_leaf<Value, Parameters, Box, Allocators, Tag> leaf;
  59         v(get<leaf>(n));
  60     }
  61 }
  62
  63 }} // namespace detail::rtree
  64
  65 }}} // namespace boost::geometry::index
  66
  67 #endif // BOOST_GEOMETRY_INDEX_DETAIL_RTREE_NODE_DYNAMIC_VISITOR_HPP