Asked • 04/02/19

I can't understand this expression?

A typical use of a function object is in writing callback functions. A callback in procedural languages, such as C, may be performed by using function pointers. Here is the sentence that confuses me:>However it can be difficult or awkward to pass a state into or out of the callback function.In particular, I can't understand this expression: ***pass a state into or out of the callback function***. Can you explain it to me?

Kristen O.

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