Question

Which classes are called as mixin?

(a) Represent a secondary design

(b) Classes express functionality which represents responsibilities

(c) Standard logging stream

(d) Represent a priary design

This question was posed to me in a national level competition.

My question is from Class Hierarchies Introduction in section Class Hierarchies, Library & Containers of C++

Answer 1

The correct option is (b) Classes express functionality which represents responsibilities

The best I can explain: A class that expresses functionality rather than its primary design role is called a mixin.