eyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
                  <span class="identifier">arg</span> <span class="special">&amp;</span><span class="keyword">operator</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="identifier">value</span><span class="special">);</span>
          <span class="keyword">explicit</span> <span class="iden