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Why we use :: template-template parameter?

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Why we use :: template-template parameter?

(a) binding

(b) rebinding

(c) both binding & rebinding

(d) reusing

I got this question during a job interview.

The origin of the question is Template Arguments to Specify Policy Usage topic in chapter Derived Classes, Templates & Exception Handling in C++ of C++

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Correct option is (c) both binding & rebinding

To explain I would say: It is used to adapt a policy into binary ones.

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