I want to implement a derived class that should also implement an interface, that have a function that the base class can call. The following gives a warning as it is not safe to pass a this pointer to the base class constructor:

struct IInterface
{
    void FuncToCall() = 0;
};

struct Base
{
    Base(IInterface* inter) { m_inter = inter; }

    void SomeFunc() { inter->FuncToCall(); }

    IInterface* m_inter;
};

struct Derived : Base, IInterface
{
    Derived() : Base(this) {}

    FuncToCall() {}
};

What is the best way around this? I need to supply the interface as an argument to the base constructor, as it is not always the dervied class that is the interface; sometimes it may be a totally different class.

I could add a function to the base class, SetInterface(IInterface* inter), but I would like to avoid that.