Question

Which of te following is a built-in example of functors in C++?

(a) mltiplication<T> f(a1, a2);

(b) add<T> f(a1, a2);

(c) subtract<T> f(a1, a2);

(d) plus<T> f(a1, a2);

I had been asked this question in my homework.

I'm obligated to ask this question of Functors topic in portion Algorithms, Objects & Iterators in C++ of C++

Answer 1

Right choice is (d) plus<T> f(a1, a2);

The best explanation: plus<T> f(a1, a2); is one of the correct in-built functor available.