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Which of the following header file is required to use in-bulit functors of C++?

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Which of the following header file is required to use in-bulit functors of C++?

(a) <any>

(b) <fucntional>

(c) <functor>

(d) <function>

The question was posed to me during an internship interview.

This interesting question is from Functors topic in portion Algorithms, Objects & Iterators in C++ of C++

1 Answer

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Best answer
Right choice is (b) <fucntional>

Best explanation: <functional> header file is required to use the fuctionality of in-built functors provided by C++.

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