Sorry for the spam.  I got the answer, how to do it. Ignore my previous mail.

[quote]

#include <boost/shared_ptr.hpp>
#include <iostream>
using namespace std;

class A {
    public:
    void hello () { cout << "Hello, friends...!" << endl; }
};

typedef boost::shared_ptr<A> APtr;

void* callbk (void* o) {
    APtr a = *static_cast<APtr*>(o);
    a->hello();
}

int main() {
A* rawPtr = new A;
boost::shared_ptr<A>sPtr(rawPtr);
callbk((void*)&sPtr);
return 0;
}
[/quote]