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61 lines
2.2 KiB
C++
61 lines
2.2 KiB
C++
#ifndef __octree_node
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#define __octree_node
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#include <iterator>
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template <typename T_, int d_, typename A_>
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class octree;
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/**\brief An n-dimensional octree node.
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*
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* Each child node is indexed by an integer whose first d_ bits describe the node's position in its
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* parent node. A bit value of 0 means the node is to the on the lower side of the hyperplane
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* bisecting the corresponding axis. There are \f$2^{\mathrm{\texttt{\d_}}}\f$ child nodes foreach
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* non-leaf node. As an example, consider a 3-dimensional octree (coordinate axes x, y, and z) with
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* a child node index of 5. The value 5 corresponds to a bit vector of 101, which indicates that
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* node 5 is on the +x, -y, and +z sides of the x, y, and z (respectively) planes bisecting the
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* parent.
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*
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* Octree nodes store application data, a list of pointers to child nodes (or NULL) and
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* a pointer to their direct octree node parent.
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*/
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template <typename T_, int d_ = 3, typename A_ = std::allocator<T_> >
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struct octree_node
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{
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typedef octree<T_, d_, A_>* octree_pointer;
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typedef octree_node<T_, d_, A_>* octree_node_pointer;
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typedef const octree_node<T_, d_, A_>* const_octree_node_pointer;
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typedef octree_node<T_, d_, A_>& octree_node_reference;
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typedef const octree_node<T_, d_, A_>& const_octree_node_reference;
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typedef T_ value_type;
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typedef T_* pointer;
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typedef T_& reference;
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typedef const T_* const_pointer;
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typedef const T_& const_reference;
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octree_node_pointer _M_parent;
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octree_node_pointer _M_children;
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value_type _M_data;
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octree_node();
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octree_node(octree_node_pointer parent, const value_type& data);
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~octree_node();
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bool is_leaf_node() { return this->_M_children == nullptr; }
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int num_children() { return this->_M_children ? (1 << d_) : 0; }
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bool add_children();
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bool add_children(const T_& child_initializer);
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bool remove_children();
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reference value() { return this->_M_data; }
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reference value() const { return this->_M_data; }
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const_octree_node_reference operator[](int child) const;
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octree_node_reference operator[](int child);
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reference operator*() { return _M_data; }
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const_reference operator*() const { return _M_data; }
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};
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#endif // __octree_node
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