Dune::Amg::SubGraph< G, T > Class Template Reference

A subgraph of a graph. More...

#include <dune/istl/paamg/graph.hh>

Classes
class	EdgeIndexMap
	An index map for mapping the edges to indices. More...
class	EdgeIterator
	The edge iterator of the graph. More...
class	VertexIterator
	The vertex iterator of the graph. More...

Public Types
typedef G	Graph
	The type of the graph we are a sub graph for.
typedef T	Excluded
	Random access container providing information about which vertices are excluded.
typedef Graph::VertexDescriptor	VertexDescriptor
	The vertex descriptor.
typedef EdgeIterator	ConstEdgeIterator
	The constant edge iterator type.
typedef VertexIterator	ConstVertexIterator
	The constant vertex iterator type.

Public Member Functions
EdgeIndexMap	getEdgeIndexMap ()
	Get an edge index map for the graph. More...
ConstVertexIterator	begin () const
	Get an iterator over the vertices. More...
ConstVertexIterator	end () const
	Get an iterator over the vertices. More...
ConstEdgeIterator	beginEdges (const VertexDescriptor &source) const
	Get an iterator over the edges starting at a vertex. More...
ConstEdgeIterator	endEdges (const VertexDescriptor &source) const
	Get an iterator over the edges starting at a vertex. More...
std::size_t	noVertices () const
	Get the number of vertices in the graph.
VertexDescriptor	maxVertex () const
	Get the maximal vertex descriptor. More...
std::size_t	noEdges () const
	Get the number of edges in the graph.
EdgeDescriptor	findEdge (const VertexDescriptor &source, const VertexDescriptor &target) const
	Find the descriptor of an edge. More...
	SubGraph (const Graph &graph, const T &excluded)
	Constructor. More...
	~SubGraph ()
	Destructor.

Detailed Description

template<class G, class T>
class Dune::Amg::SubGraph< G, T >

A subgraph of a graph.

This is a (cached) view of a graph where certain vertices and edges pointing to and leading from them are skipped.

The vertex descriptors are not changed.

Constructor & Destructor Documentation

SubGraph()

template<class G , class T >

Dune::Amg::SubGraph< G, T >::SubGraph	(	const Graph &	graph,
		const T &	excluded
	)

Constructor.

Parameters

graph	The graph we are a sub graph for.
excluded	If excluded[i] is true then vertex i will not appear in the sub graph.

Member Function Documentation

begin()

template<class G , class T >

ConstVertexIterator Dune::Amg::SubGraph< G, T >::begin

(

)

const

Get an iterator over the vertices.

Returns

A vertex Iterator positioned at the first vertex.

beginEdges()

template<class G , class T >

ConstEdgeIterator Dune::Amg::SubGraph< G, T >::beginEdges

(

const VertexDescriptor &

source

)

const

Get an iterator over the edges starting at a vertex.

Parameters

source

The vertex where the edges should start.

Returns

An edge iterator positioned at the first edge starting from vertex source.

end()

template<class G , class T >

ConstVertexIterator Dune::Amg::SubGraph< G, T >::end

(

)

const

Get an iterator over the vertices.

Returns

A vertex Iterator positioned behind the last vertex.

endEdges()

template<class G , class T >

ConstEdgeIterator Dune::Amg::SubGraph< G, T >::endEdges

(

const VertexDescriptor &

source

)

const

Get an iterator over the edges starting at a vertex.

Parameters

source

The vertex where the edges should start.

Returns

An edge iterator positioned behind the last edge starting from vertex source.

findEdge()

template<class G , class T >

EdgeDescriptor Dune::Amg::SubGraph< G, T >::findEdge	(	const VertexDescriptor &	source,
		const VertexDescriptor &	target
	)		const

Find the descriptor of an edge.

Parameters

source	The source vertex of the edge we search for.
target	The target vertex of the edge we search for.

Returns

The edge we found or numeric_limits<EdgeIterator>::max() if it does not exist.

getEdgeIndexMap()

template<class G , class T >

EdgeIndexMap Dune::Amg::SubGraph< G, T >::getEdgeIndexMap

(

)

Get an edge index map for the graph.

Returns

An edge index map for the graph.

maxVertex()

template<class G , class T >

VertexDescriptor Dune::Amg::SubGraph< G, T >::maxVertex

(

)

const

Get the maximal vertex descriptor.

Returns

The minimum value v such that for all vertices w in the graph w<v holds.

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

• dune/istl/paamg/graph.hh