raction_traits</span><span class="special">&lt;</span><span class="identifier">Gen</span><span class="special">&gt;::</span><span class="identifier">result_type</span>
   <span class="identifier">continued_fraction_a</span><span class="special">(</span><span class="identifier">Gen</span><span class="special">&amp;</span> <span class="identifier">g</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">U</span><span class="special">&amp;</span> <span class="identifie