m>a,b &gt; 0</em></span>.
        </p>
<p>
          The return type of these functions is computed using the <a class="link" href="../../main_overview/result_type.html" title="Calculation of the Type of the Result"><span class="emphasis"><em>result
          type calculation rules</em></span></a> when T1, T2 and T3 are different
          types.
        </p>
<p>
          The final <a class="link" href="../../policy.html" title="Policies">Policy</a> argument is
          optional and can be used to control