l">&amp;</span> <span class="identifier">member</span><span class="special">;</span>

    <span class="keyword">explicit</span> <span class="keyword">constexpr</span> <span class="identifier">base_from_member</span><span class="special">(</span> <span class="identifier">MemberType</span><span class="special">&amp;</span> <span class="identifier">x</span> <span class="special">)</span>
        <span class="keyword">noexcept</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<p>
     