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What are binary functors?

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What are binary functors?

(a) Functors that accepts only one parameter

(b) Functors that accepts more than one parameters

(c) Functors that accepts two parameters

(d) Functors that accepts other than a specific type of parameter

I had been asked this question in semester exam.

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

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The correct choice is (c) Functors that accepts two parameters

To explain: Binary functors are those which accepts two arguments as a parameter in a functor.

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