</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">Allocator</span></code></span></dt>
<dd><p>
                A standard allocator type.
              </p></dd>
</dl>
</div>
<h6>
<a name="spirit.advanced.customize.is_string.h5"></a>
          <span class="phrase"><a name="spirit.advanced.customize.is_string.expression_semantics"></a></span><a class="link" href="is_string.html#spirit.advanced.customize.is_string.expression_semantics">Expression
          Semantics</a>
   