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// Boost.Geometry Index
//
// R-tree nodes based on Boost.Variant, storing std::vectors
//
// 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_NODE_DEFAULT_VARIANT_HPP
#define BOOST_GEOMETRY_INDEX_DETAIL_RTREE_NODE_NODE_DEFAULT_VARIANT_HPP
namespace boost { namespace geometry { namespace index {
namespace detail { namespace rtree {
// nodes default types
template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
struct static_internal_node
{
typedef typename Allocators::node_allocator_type::template rebind<
rtree::ptr_pair<Box, typename Allocators::node_pointer>
>::other elements_allocator_type;
typedef boost::container::vector<
rtree::ptr_pair<Box, typename Allocators::node_pointer>,
elements_allocator_type
> elements_type;
template <typename Al>
inline static_internal_node(Al const& al)
: elements(al)
{}
elements_type elements;
};
template <typename Value, typename Parameters, typename Box, typename Allocators, typename Tag>
struct static_leaf
{
typedef typename Allocators::node_allocator_type::template rebind<
Value
>::other elements_allocator_type;
typedef boost::container::vector<
Value,
elements_allocator_type
> elements_type;
template <typename Al>
inline static_leaf(Al const& al)
: elements(al)
{}
elements_type elements;
};
// nodes traits
template <typename Value, typename Parameters, typename Box, typename Allocators>
struct node<Value, Parameters, Box, Allocators, node_s_mem_dynamic_tag>
{
typedef boost::variant<
static_leaf<Value, Parameters, Box, Allocators, node_s_mem_dynamic_tag>,
static_internal_node<Value, Parameters, Box, Allocators, node_s_mem_dynamic_tag>
> type;
};
template <typename Value, typename Parameters, typename Box, typename Allocators>
struct internal_node<Value, Parameters, Box, Allocators, node_s_mem_dynamic_tag>
{
typedef static_internal_node<Value, Parameters, Box, Allocators, node_s_mem_dynamic_tag> type;
};
template <typename Value, typename Parameters, typename Box, typename Allocators>
struct leaf<Value, Parameters, Box, Allocators, node_s_mem_dynamic_tag>
{
typedef static_leaf<Value, Parameters, Box, Allocators, node_s_mem_dynamic_tag> type;
};
// visitor traits
template <typename Value, typename Parameters, typename Box, typename Allocators, bool IsVisitableConst>
struct visitor<Value, Parameters, Box, Allocators, node_s_mem_dynamic_tag, IsVisitableConst>
{
typedef static_visitor<> type;
};
// allocators
template <typename Allocator, typename Value, typename Parameters, typename Box>
class allocators<Allocator, Value, Parameters, Box, node_s_mem_dynamic_tag>
: public Allocator::template rebind<
typename node<Value, Parameters, Box, allocators<Allocator, Value, Parameters, Box, node_s_mem_dynamic_tag>, node_s_mem_dynamic_tag>::type
>::other
{
typedef typename Allocator::template rebind<
Value
>::other value_allocator_type;
public:
typedef Allocator allocator_type;
typedef Value value_type;
typedef typename value_allocator_type::reference reference;
typedef typename value_allocator_type::const_reference const_reference;
typedef typename value_allocator_type::size_type size_type;
typedef typename value_allocator_type::difference_type difference_type;
typedef typename value_allocator_type::pointer pointer;
typedef typename value_allocator_type::const_pointer const_pointer;
typedef typename Allocator::template rebind<
typename node<Value, Parameters, Box, allocators, node_s_mem_dynamic_tag>::type
>::other::pointer node_pointer;
// typedef typename Allocator::template rebind<
// typename internal_node<Value, Parameters, Box, allocators, node_s_mem_dynamic_tag>::type
// >::other::pointer internal_node_pointer;
typedef typename Allocator::template rebind<
typename node<Value, Parameters, Box, allocators, node_s_mem_dynamic_tag>::type
>::other node_allocator_type;
inline allocators()
: node_allocator_type()
{}
template <typename Alloc>
inline explicit allocators(Alloc const& alloc)
: node_allocator_type(alloc)
{}
inline allocators(BOOST_FWD_REF(allocators) a)
: node_allocator_type(boost::move(a.node_allocator()))
{}
inline allocators & operator=(BOOST_FWD_REF(allocators) a)
{
node_allocator() = boost::move(a.node_allocator());
return *this;
}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
inline allocators & operator=(allocators const& a)
{
node_allocator() = a.node_allocator();
return *this;
}
#endif
void swap(allocators & a)
{
boost::swap(node_allocator(), a.node_allocator());
}
bool operator==(allocators const& a) const { return node_allocator() == a.node_allocator(); }
template <typename Alloc>
bool operator==(Alloc const& a) const { return node_allocator() == node_allocator_type(a); }
Allocator allocator() const { return Allocator(node_allocator()); }
node_allocator_type & node_allocator() { return *this; }
node_allocator_type const& node_allocator() const { return *this; }
};
// create_node_variant
template <typename VariantPtr, typename Node>
struct create_static_node
{
template <typename AllocNode>
static inline VariantPtr apply(AllocNode & alloc_node)
{
typedef boost::container::allocator_traits<AllocNode> Al;
typedef typename Al::pointer P;
P p = Al::allocate(alloc_node, 1);
if ( 0 == p )
throw_runtime_error("boost::geometry::index::rtree node creation failed");
auto_deallocator<AllocNode> deallocator(alloc_node, p);
Al::construct(alloc_node, boost::addressof(*p), Node(alloc_node)); // implicit cast to Variant
deallocator.release();
return p;
}
};
// destroy_node_variant
template <typename Node>
struct destroy_static_node
{
template <typename AllocNode, typename VariantPtr>
static inline void apply(AllocNode & alloc_node, VariantPtr n)
{
typedef boost::container::allocator_traits<AllocNode> Al;
Al::destroy(alloc_node, boost::addressof(*n));
Al::deallocate(alloc_node, n, 1);
}
};
// create_node
template <typename Allocators, typename Value, typename Parameters, typename Box, typename Tag>
struct create_node<
Allocators,
static_internal_node<Value, Parameters, Box, Allocators, Tag>
>
{
static inline typename Allocators::node_pointer
apply(Allocators & allocators)
{
return create_static_node<
typename Allocators::node_pointer,
static_internal_node<Value, Parameters, Box, Allocators, Tag>
>::apply(allocators.node_allocator());
}
};
template <typename Allocators, typename Value, typename Parameters, typename Box, typename Tag>
struct create_node<
Allocators,
static_leaf<Value, Parameters, Box, Allocators, Tag>
>
{
static inline typename Allocators::node_pointer
apply(Allocators & allocators)
{
return create_static_node<
typename Allocators::node_pointer,
static_leaf<Value, Parameters, Box, Allocators, Tag>
>::apply(allocators.node_allocator());
}
};
// destroy_node
template <typename Allocators, typename Value, typename Parameters, typename Box, typename Tag>
struct destroy_node<
Allocators,
static_internal_node<Value, Parameters, Box, Allocators, Tag>
>
{
static inline void apply(Allocators & allocators, typename Allocators::node_pointer n)
{
destroy_static_node<
static_internal_node<Value, Parameters, Box, Allocators, Tag>
>::apply(allocators.node_allocator(), n);
}
};
template <typename Allocators, typename Value, typename Parameters, typename Box, typename Tag>
struct destroy_node<
Allocators,
static_leaf<Value, Parameters, Box, Allocators, Tag>
>
{
static inline void apply(Allocators & allocators, typename Allocators::node_pointer n)
{
destroy_static_node<
static_leaf<Value, Parameters, Box, Allocators, Tag>
>::apply(allocators.node_allocator(), n);
}
};
}} // namespace detail::rtree
}}} // namespace boost::geometry::index
#endif // BOOST_GEOMETRY_INDEX_DETAIL_RTREE_NODE_NODE_DEFAULT_VARIANT_HPP
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