>,</span> 
                        <span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">,</span> 
                        <span class="keyword">const</span> <span class="identifier">string_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special"