visitor)
BOOST_PARAMETER_NAME(root_vertex)
BOOST_PARAMETER_NAME(index_map)
BOOST_PARAMETER_NAME(color_map)

BOOST_PARAMETER_FUNCTION((void), f, tag,
  (required (graph, *))
''') -->
<!-- @example.append(') {}') -->
<!-- @test('compile') -->
</div>
<div class="section" id="handling-out-parameters">
<h4>2.1.5.3&nbsp;&nbsp;&nbsp;Handling “Out” Parameters</h4>
<div class="compound">
<p class="compound-first">Within the function body, a parameter name such as <tt class="docutils literal">visitor</tt> is
a <e