ers can have (see <a class="footnote-reference" href="#id23" id="id2" name="id2">[11]</a> and <a class="footnote-reference" href="#id25" id="id3" name="id3">[12]</a>).</li>
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<li>Usually faster than using containers of smart pointers (see <a class="footnote-reference" href="#id23" id="id4" name="id4">[11]</a> and <a class="footnote-reference" href="#id25" id="id5" name="id5">[12]</a>).</li>
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<li>The interf