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// Boost.Geometry Index
//
// R-tree nodes dynamic visitor and nodes base type
//
// Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland.
//
// 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_INDEX_DETAIL_RTREE_NODE_DYNAMIC_VISITOR_HPP
#define BOOST_GEOMETRY_INDEX_DETAIL_RTREE_NODE_DYNAMIC_VISITOR_HPP
namespace boost { namespace geometry { namespace index {
namespace detail { namespace rtree {
// visitor forward declaration
template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag, bool IsVisitableConst>
struct dynamic_visitor;
// node
template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
struct dynamic_node
{
virtual ~dynamic_node() {}
virtual void apply_visitor(dynamic_visitor<Value, Parameters, Box, Allocators, Tag, false> &) = 0;
virtual void apply_visitor(dynamic_visitor<Value, Parameters, Box, Allocators, Tag, true> &) const = 0;
};
// nodes variants forward declarations
template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
struct dynamic_internal_node;
template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
struct dynamic_leaf;
// visitor
template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
struct dynamic_visitor<Value, Parameters, Box, Allocators, Tag, true>
{
typedef dynamic_internal_node<Value, Parameters, Box, Allocators, Tag> internal_node;
typedef dynamic_leaf<Value, Parameters, Box, Allocators, Tag> leaf;
virtual ~dynamic_visitor() {}
virtual void operator()(internal_node const&) = 0;
virtual void operator()(leaf const&) = 0;
};
template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
struct dynamic_visitor<Value, Parameters, Box, Allocators, Tag, false>
{
typedef dynamic_internal_node<Value, Parameters, Box, Allocators, Tag> internal_node;
typedef dynamic_leaf<Value, Parameters, Box, Allocators, Tag> leaf;
virtual ~dynamic_visitor() {}
virtual void operator()(internal_node &) = 0;
virtual void operator()(leaf &) = 0;
};
// nodes conversion
template <typename Derived, typename Parameters, typename Value, typename Box, typename Allocators, typename Tag>
inline Derived & get(dynamic_node<Value, Parameters, Box, Allocators, Tag> & n)
{
BOOST_GEOMETRY_INDEX_ASSERT(dynamic_cast<Derived*>(&n), "can't cast to a Derived type");
return static_cast<Derived&>(n);
}
// apply visitor
template <typename Visitor, typename Visitable>
inline void apply_visitor(Visitor & v, Visitable & n)
{
BOOST_GEOMETRY_INDEX_ASSERT(&n, "null ptr");
n.apply_visitor(v);
}
}} // namespace detail::rtree
}}} // namespace boost::geometry::index
#endif // BOOST_GEOMETRY_INDEX_DETAIL_RTREE_NODE_DYNAMIC_VISITOR_HPP
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