pan class="special">,</span> 
                   <a class="link" href="attribute_value_set.html" title="Class attribute_value_set">attribute_value_set</a> <span class="keyword">const</span> <span class="special">&amp;</span> attrs<span class="special">)</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp92744800"></a><h2>Description</h2>
<p>The function extracts an attribute value from the view. The user has to explicitly specify the type or set of possible types of the attr