ked for each signal
    called. Compare, for example, a combiner that returns the maximum
    element from calling the slots. If the maximum element ever
    exceeds 100, no more slots are to be called.</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th align="left"><p>Pull</p></th>
<th align="left"><p>Push</p></th>
</tr></thead>
<tbody><tr>
<td align="left">
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisti