     <code class="computeroutput"><span class="identifier">handler_ptr</span></code> gives the strong
          exception guarantee. The constructor signature for managed objects constructed
          by <code class="computeroutput"><span class="identifier">handler_ptr</span></code> now receives
          a <code class="computeroutput"><span class="keyword">const</span></code> reference to the handler.
          Actions required: Change the constructor signature for state objects used
          with <code c