omputeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code>). The following table outlines
          the predefined mapping rules from the attribute type to the generator type.
          These rules are applied recursively to create the generator type which
          can be used to generate output from the given attribute type.
        </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
  