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

<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">ForwardRange</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">UnaryPredicate</span><span class="special">,</span> <