eyword">explicit</span></code> in class
        <code class="computeroutput"><span class="identifier">number</span></code>, authors of backend
        types should generally specialise one of the traits above, rather than this
        one directly.
      </p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="identifier">is_signed_number</span><sp