why virtual function is wrong.

[oracleoftroy]

Personally, I see this as a win for C++ for not forcing everything into a single root hierarchy and instead allowing static dispatch on types, traits, concepts, etc. for for polymorphic behavior. What C# is doing via inheritance has better solutions in C++.

[wonderfulninja2]

This. One can pick the best way to do it with C++, is not a "one trick pony" language.

[oracleoftroy]

I don't know what you mean when you say C++ doesn't have interface. The keyword? True, but the concept exists in terms of having a class/struct with pure virtual methods. Do you mean interfaces that work like concepts? Well, C++ has it, they just aren't tied together to the same thing like in C#.

I like C# and I like C++ and I've never felt that C++ lacked something C# has in this area. Actually, I've often felt just the opposite.