What does this syntax mean. (::*)

Question

While refactoring a piece of code I came across the line below:

class Bar
{
protected:
    int (Bar::* fooFunction)(float); //this line
}

I have never seen this kind of syntax before. What is this syntax and why is it used it used in C++?

Pointer to member function. As to why it's used, that depends on what the class is supposed to do. — , Aug 17 '17 at 16:04
Lookup member function pointer in your favorite search engine. You can start at http://en.cppreference.com/w/cpp/language/pointer. — R Sahu, Aug 17 '17 at 16:06

score 1 · Accepted Answer · answered Aug 17 '17 at 16:06

1

It's a member function pointer.

Specifically, it's a pointer to a member function of a Bar object that takes a float argument and returns a int.

answered Aug 17 '17 at 16:06

Jesper Juhl

score -1 · Answer 2 · answered Aug 17 '17 at 16:06

-1

What is this syntax

It declares a pointer to member function.

why is it used it used in C++?

It is used to point to non-static member functions.

answered Aug 17 '17 at 16:06

eerorika

2 Answers2