der is preserved for equivalent elements.
          </p>
<p>
            For versions of the <code class="computeroutput"><span class="identifier">stable_sort</span></code>
            function without a predicate ascending order is defined by <code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;()</span></code>
            such that for all adjacent elements <code class="computeroutput"><span class="special">[</span><span class="identifier">x</span><span class="specia