nsertions.html" title="Advanced lookup and insertion functions for associative containers">advanced
      lookup and insertions</a> and the user can change the key type in each lookup/insertion
      check call.
    </p>
<p>
      On the other hand, in many cases containers are indexed by a well-known key
      type, and the user is forced to write some repetitive code using advanced lookup
      and insertions. <span class="bold"><strong>Boost.Intrusive</strong></span> associative
      containers offer an