s for <code class="computeroutput"><span class="identifier">size_member_tester</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code>
        if the operation is valid, and an alias for <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">nonesuch</span></code>
        otherwise.
      </p>
<p>
        See also: <a class="link" href="is_detected.html" title="is_detected">is_detected