STL class for reference-counted pointers?

Question

This should be trivial but I can\'t seem to find it (unless no such class exists!)

What\'s the STL class (or set of classes) for smart pointers?

UPDATE

Answer 1

There is an alternative implemented for some time in STL PLUS, see at source forge

"STLplus was originally intended as a library to extend the STL by providing missing container data structures such as smart-pointers, matrices, trees and graphs."