| Function sourceVertex Returns the source vertex of an edge. sourceVertex(g, e) sourceVertex(it) Parameters
g | A graph. Types: Graph
e | An edge descriptor. Types: EdgeDescriptor
it | An edge iterator. Types: Edge Iterator, Out-Edge Iterator
Return Values A vertex descriptor. Types: VertexDescriptor Remarks In a tree the source vertex is always the parent. In an undirected graph the smaller vertex descriptor is the source. Note: If source vertices are not stored in the EdgeStump this operation is expensive. Consider using sourceVertex directly on an edge iterator where this operation is fast! See Also targetVertex SeqAn - Sequence Analysis Library - www.seqan.de