How to use base class & child class as parameter in one function ?

[H. S. Teoh]

On Fri, May 22, 2020 at 09:39:16PM +0000, Vinod K Chandran via Digitalmars-d-learn wrote:
[...]
> So in the same manner, i want
> void function(Base) = fnPtr wiil work with
> void function(Child)

You cannot, because that's type unsafe:

	class Base {}
	class Derived : Base {
		void derivedFunc() {}
	}
	class Another : Base {}

	void derivedFunc(Derived d) { d.derivedFunc(); }

	void function(Base) funPtr;
	funPtr = derivedFunc; // suppose this was allowed

	Base obj = new Another;
	funPtr(obj); // crash: obj does not have derivedFunc()


T

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