 class="number">3.14</span><span class="special">);</span>  <span class="comment">// OK explicit construction is allowed</span>
</pre>
<p>
      Mixed arithmetic will fail if the conversion is either ambiguous or explicit:
    </p>
<pre class="programlisting"><span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">cpp_int_backend</span><span class="special">&lt;&gt;,</span> <span class="identifier">et_off</span><span class="special">&gt;</span> <span class="identifier