c++ - What is the meaning of `typename` in this example? -


this question has answer here:

i looking @ example implementation of binder1st, looks this:

template <class operation, class t>   binder1st<operation> bind1st (const operation& op, const t& x) {   return binder1st<operation>(op, typename operation::first_argument_type(x)); }

what meaning of typename operation::first_argument_type(x). understand first_argument_type typename, belonging binary_function base class. looks me function belonging namespace operation - in case, why typename used here?

it means qualified name follows typename keyword (i.e. operation::first_argument_type) interpreted name of (dependent) type.

you can read full explanation of keyword typename (which has another, different usage) here.


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