tifier">handler</span><span class="special">&gt;</span> <span class="identifier">p_</span><span class="special">;</span>

<span class="keyword">public</span><span class="special">:</span>
    <span class="identifier">null_parser</span><span class="special">()</span>
        <span class="special">:</span> <span class="identifier">p_</span><span class="special">(</span><span class="identifier">parse_options</span><span class="special">())</span>
    <span class="special">{</span>
    <span class="special">}</