Hi,
Consider the code below:

These interfaces are defined in a header.

class IA
{
public:
    virtual void A() = 0;
};

class IB
{
public:
    virtual void B() = 0;
};

This concrete class is defined in a library which is later dynamically loaded.

class Implementation : public IA, public IB 
{
    public:
       void A() {//Do something}
       void B() {//Do something else}
};

extern "C" IA* GetObject() {return new Implementation();}

This is the main program

int main()
{
   dlopen();
   dlsym("");
   IA* pA = GetObject(); //You get the idea
   
   pA->A(); //Works fine
   (IB*)pA->B();    //WRONG FUCNTION CALLED!(Destructor of Implementation class in my case)
}

What is wrong here, and how do I overcome it?

Thanks

Use

dynamic_cast<IB*>(pA)->B();