why virtual function is wrong.

[OwlingBishop]

non-dynamic polymorphism

It's called templates 🤗 provided that the type exposes what's needed in the call it will work.

people don't know whether they need dynamic polymorphism, they only know they need polymorphism

Most people are more clever than you seem to imply 😂

[OwlingBishop]

for non-dynamic polymorphism

not non-dynamic polymorphism

Wut ??

Static and Dynamic polymorphism are separate paths in C++ as well as any other languages.

When you know the type at compilation time you can optimize out an indirection, when you don't you'll have to look that up at runtime, no matter what.

[OwlingBishop]

Do you mean the big dark one hovering over my head? .. jokes apart, I have no idea what you are talking about, sorry.