ty_map/doc/ReadablePropertyMap.html">Readable Property
Map</a> and must map the vertex descriptors of <tt>G</tt> to the
integers in the half-open range <tt>[0,num_vertices(G))</tt>.<br>

<b>Default:</b> <tt>get(vertex_index, G)</tt>.
Note: if you use this default, make sure your graph has
an internal <tt>vertex_index</tt> property. For example,
<tt>adjacenty_list</tt> with <tt>VertexList=listS</tt> does
not have an internal <tt>vertex_index</tt> property.
</blockquote>


UTIL/OUT: <tt>orig_to_copy(Orig2Copy