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<h1><a class="anchor" name="parallel_do_body_req">Requirements on parallel_do body</a></h1>Class <code>Body</code> implementing the concept of parallel_do body must define: -<div class="fragment"><pre class="fragment">        B::operator()( 
                cv_item_type item,
                parallel_do_feeder&lt;item_type&gt;&amp; feeder
        ) <span class="keyword">const</span>
        
        OR

        B::operator()( cv_item_type&amp; item ) <span class="keyword">const</span>
</pre></div> Process item. May be invoked concurrently for the same <code>this</code> but different <code>item</code>.<p>
-<div class="fragment"><pre class="fragment"> item_type( <span class="keyword">const</span> item_type&amp; ) 
</pre></div> Copy a work item. -<div class="fragment"><pre class="fragment"> ~item_type() 
</pre></div> Destroy a work item <hr>
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