al">,</span> <span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">a1</span><span class="special">)</span> <span class="keyword">const</span>
        <span class="special">{</span>
            <span class="keyword">return</span> <span class="identifier">a0</span> <span class="special">+</span> <span class="identifier">a1</span><span class="special">;</span>
        <span class="special">}</span>

        <span class="keyword">templa