Run-Time Checking of a Cast from a void*

Question

Say that I have a void* containing a pointer to an unknown class. I want to use dynamic_cast to do run-time checking on the type of cl

Answer 1

To ensure dynamic_cast compiles and works, you should create an abstract or interface class with a virtual method.

#include 

class Bar
{
public:
    Bar() = default;
     virtual ~Bar() = default;
};

class Foo : public Bar
{
public:
    Foo() = default;
    virtual ~Foo() = default;
};

int main()
{
    Bar* bar = new Foo;
    Foo* foo = dynamic_cast(bar);
    assert(foo != nullptr);
}