 default_color_map(num_vertices(<strong>graph</strong>), index_map) )
)
</pre>
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<p class="compound-last">A default expression is evaluated in the context of all preceding
parameters, so you can use any of their values by name.</p>
</div>
<div class="compound">
<p class="compound-first">A default expression is never evaluated—or even instantiated—if
an actual argument is passed for that parameter.  We can actually
demonstrate that with our code so far by replacing the body of
<tt class=