der file. For 
				compatibility, the <a href="../../boost/smart_ptr.hpp">&lt;boost/smart_ptr.hpp&gt;</a>
			header now includes the headers for the four classic smart pointer class 
			templates.
			<li>
				The <b>weak_ptr</b>
			template was added.
			<li>
				The new <b>shared_ptr</b> and <b>shared_array</b> relax the requirement that 
				the pointed-to object's destructor must be visible when instantiating the <b>shared_ptr</b>
			destructor. This makes it easier to have shared_ptr members in classes 