shared_ptr and inheritance

8 Dec 2001

      Hello

I have the following scenario:

#include <iostream>
#include <boost/smart_ptr.hpp>

class A
{
public:
 virtual void func1() { std::cout << "A::func1" << std::endl; }
};

class B : public A
{
public:
 void func1() { std::cout << "B::func1" << std::endl; }
 void funcB() { std::cout << "B::funcB" << std::endl; }
};

class C : public A
{
public:
 void func1() { std::cout << "C::func1" << std::endl; }
 void funcC() { std::cout << "C::funcB" << std::endl; }
};

class Holder
{
 boost::shared_ptr<A> aptr;
public:
 void setclass(boost::shared_ptr<A> a) { aptr = a; }
 void callfunc() { aptr->func1(); }
};

int main()
{

 Holder holder;

 boost::shared_ptr<B> b(new B());      
 boost::shared_ptr<C> c(new C());     

 holder.setclass(b);    //<-------
 holder.setclass(c);    //<-------

 holder.callfunc();

return 0;
}

VC++ 6.0 flags the above lines with a conversion error.

Is there any way to resolve this?

Thanks very much in advance.

shared_ptr and inheritance

rz0