Does every class have virtual function table in C++

Question

Does every class have virtual function table in C++?

I know virtual table is for polymorphism. Class with virtual functions must have v-table. But how about class has no virtual function? Or how about class has no base class?

Answer 1

The language specification of C++ does not define what a "vtable" is, or which classes need one.

A particular implementation of C++ in a compiler often uses a vtable to implement virtual methods. If a class has no virtual methods (and no superclasses with virtual methods), then the compiler may omit the vtable. However, keep in mind this is purely a compiler implementation decision, and not required by the standard.