pan><span class="special">::</span><span class="identifier">size_t</span></code>
          </li>
</ul></div>
<div class="table">
<a name="beast.concepts.RatePolicy.valid_expressions"></a><p class="title"><b>Table&#160;1.43.&#160;Valid expressions</b></p>
<div class="table-contents"><table class="table" summary="Valid expressions">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Expression
                </p>
              </th>
<th>
                <p>
      