OpenMesh::Utils::HeapT< HeapEntry, HeapInterface > Class Template Reference

#include <OSG/Utils/HeapT.hh>

Inheritance diagram for OpenMesh::Utils::HeapT< HeapEntry, HeapInterface >:

Public Member Functions
	HeapT ()
	Constructor.
	HeapT (const HeapInterface &_interface)
	Construct with a given HeapIterface.
	~HeapT ()
	Destructor.
HeapInterface &	getInterface ()
const HeapInterface &	getInterface () const
void	clear ()
	clear the heap
bool	empty () const
	is heap empty?
size_t	size () const
	returns the size of heap
void	reserve (size_t _n)
	reserve space for _n entries
void	reset_heap_position (HeapEntry _h)
	reset heap position to -1 (not in heap)
bool	is_stored (HeapEntry _h)
	is an entry in the heap?
void	insert (HeapEntry _h)
	insert the entry _h
HeapEntry	front () const
	get the first entry
void	pop_front ()
	delete the first entry
void	remove (HeapEntry _h)
	remove an entry
void	update (HeapEntry _h)
bool	check ()
	check heap condition

Protected Attributes
HeapInterface	interface_
	Instance of HeapInterface.

Private Types
typedef std::vector< HeapEntry >	Base
typedef std::vector< HeapEntry >	HeapVector

Private Member Functions
void	upheap (size_t _idx)
	Upheap. Establish heap property.
void	downheap (size_t _idx)
	Downheap. Establish heap property.
HeapEntry	entry (size_t _idx) const
	Get the entry at index _idx.
void	entry (size_t _idx, HeapEntry _h)
	Set entry _h to index _idx and update _h's heap position.
size_t	parent (size_t _i)
	Get parent's index.
size_t	left (size_t _i)
	Get left child's index.
size_t	right (size_t _i)
	Get right child's index.

Detailed Description

template<class HeapEntry, class HeapInterface = HeapEntry>
class OpenMesh::Utils::HeapT< HeapEntry, HeapInterface >

An efficient, highly customizable heap.

The main difference (and performance boost) of this heap compared to e.g. the heap of the STL is that here the positions of the heap's elements are accessible from the elements themself. Therefore if one changes the priority of an element one does not have to remove and re-insert this element, but can just call the update(HeapEntry) method.

This heap class is parameterized by two template arguments:

• the class HeapEntry, that will be stored in the heap
• the HeapInterface telling the heap how to compare heap entries and how to store the heap positions in the heap entries.

As an example how to use the class see declaration of class Decimater::DecimaterT.

See also

HeapInterfaceT

Definition at line 138 of file HeapT.hh.

Member Function Documentation

update()

template<class HeapEntry , class HeapInterface = HeapEntry>

void OpenMesh::Utils::HeapT< HeapEntry, HeapInterface >::update ( HeapEntry  _h )

inline

update an entry: change the key and update the position to reestablish the heap property.

Definition at line 248 of file HeapT.hh.

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The documentation for this class was generated from the following file:

• OpenFlipper/libs_required/OpenMesh/src/OpenMesh/Tools/Utils/HeapT.hh