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

If you don't want/can't use Boost and your compiler implements TR1, you can use shared_ptr (borrowed from Boost):

#include 

...

std::tr1::shared_ptr ptr(new Foo);

Otherwise, no, there are no smart pointers except std::auto_ptr in vanilla STL.