Function pointer and normal function?

Calling a function through a function pointer means the call cannot be inlined; in certain cases, this can result in quite a performance penalty. (For example, C's qsort() going through a function pointer for each compare, vs. C++'s sort() being able to inline the comparison.).

A function pointer is just a pointer to a normal function. It can be passed around like any other pointer, and can be invoked somewhere other than where it was created.

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