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What are unary functors?

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What are unary functors?

(a) Functors that accepts only one parameter

(b) Functors that accepts two parameters

(c) Functors that accepts more than one parameters

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

This question was posed to me by my school teacher while I was bunking the class.

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

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Right choice is (a) Functors that accepts only one parameter

For explanation: Unary functors are those which accepts only one argument as a parameter in a functor.

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