158 /**

   159  * Template providing a predicate to allow STL containers of

   160  * pointers to pool items to be sorted by index.

   161  */

   162 template <typename T>

   163 struct PoolItemIndexLess {

   164 	/**

   165 	 * The actual comparator.

   166 	 * @param lhs the left hand side of the comparison.

   167 	 * @param rhs the right hand side of the comparison.

   168 	 * @return true if lhs' index is less than rhs' index.

   169 	 */

   170 	bool operator()(const T *lhs, const T *rhs) const

   171 	{

   172 		return lhs->index < rhs->index;

   173 	}

   174 };