Question

What is this syntax for in C++? Can someone point me to the technical term so I can see if I find anything in my text?

At first I thought it was a prototype but then the = and (*fn) threw me off…

Here is my example:

void (*fn) (int&,int&) = x;

Answer 1

It can be rewritten to

typedef void (*T) (int&, int&);
T fn = x;

The 2nd statement is obvious, which should have solved that = x; question. In the 1st statement, we make T as a synonym as the type void(*)(int&, int&), which means:

• a pointer to a function ((*…))
• returning void
• and taking 2 arguments: int&, int&.