Is there some equivalent class for C++1x's std::unique_ptr in the boost libraries? The behavior I'm looking for is being able to have an exception-safe factory function, like so...

std::unique_ptr<Base> create_base()
{
    return std::unique_ptr<Base>(new Derived);
}

void some_other_function()
{
    std::unique_ptr<Base> b = create_base();

    // Do some stuff with b that may or may not throw an exception...

    // Now b is destructed automagically.
}