Can I specify that template arguments ought to be subclasses of some base class?

I have a c开发者_如何学Class that is designed to work with a certain type of parameter. Is there any way that I can enforce that the template parameter be a pointer to a subclass of some type?

#include <type_traits>
#include <utility>

struct B { };
struct D : B { };

template <typename T>
struct S {
    typedef typename std::enable_if<std::is_base_of<B, T>::value>::type check;
};

int main()
{
    S<B> x;   // Ok!
    S<D> y;   // Ok!
    S<int> z; // Not ok!
}

The enable_if utility and the is_base_of type trait are part of the C++0x Standard Library, but both available in Boost as well.