erator range providing access to the in-edges of
    vertex
    <i>v</i> in subgraph <i>g</i>. 
    (Required by <a href="BidirectionalGraph.html">BidirectionalGraph</a>.)

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<pre>
vertex_descriptor
source(edge_descriptor e_local, const subgraph&amp; g)
</pre>
    Returns the source vertex of edge <i>e</i> in subgraph <i>g</i>.
    (Required by <a href="IncidenceGraph.html">IncidenceGraph</a>.)

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<pre>
vertex_descriptor
target(edge_descriptor e_local, const subgraph&amp; g)
</pre>
    Returns the tar