es. If the graph
is using vertex names, the vertex will be added on whichever process
&quot;owns&quot; that name. Otherwise, the vertex will be stored in the local
process. Note that the second constructor will invoke the
user-customizable internal vertex constructor, which (by default)
throws an exception when it sees an unknown vertex.</p>
<p>The return type is of unspecified type, but can be copy-constructed
and can be implicitly converted into a vertex descriptor.</p>
<hr class="docutils" />
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