an> <span class="identifier">UniqueID</span> <span class="special">&gt;</span>
<span class="keyword">class</span> <span class="identifier">base_from_member</span><span class="special">&lt;</span><span class="identifier">MemberType</span><span class="special">&amp;,</span> <span class="identifier">UniqueID</span><span class="special">&gt;</span>
<span class="special">{</span>
<span class="keyword">protected</span><span class="special">:</span>
    <span class="identifier">MemberType</span><span class="specia