Cryptic C ++ "thing" (function pointer)

Question

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

At first I thought it was a prototype, but then =they (*fn)threw me away ...

Here is my example:

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

Answer 1

It can be rewritten in

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

The 2nd statement is obvious that this issue should have been resolved = x;. In the first statement, we do Tas a type synonym void(*)(int&, int&), which means:

• function pointer ( (*…))
• return void
• and takes 2 arguments int&, int&.

Answer 2

int, . fn x.

Answer 3

.

fn :

void pointedToFunction(int&, int&)

fn , x.

:

int a;
int b;
(*fn)(a,b);

int a;
int b;
pointedToFunction(a,b);

Answer 4

.

http://www.newty.de/fpt/intro.html#what

^ .: -)

Answer 5

, int void.

Answer 6

, . fn. x, , , , .

Answer 7

, 2 void. x .

Answer 8

, =.

:

typedef void func_t(int&,int&);

, :

typedef func_t *fn_t;

:

 fn_t fn = ...;

Answer 9

: http://en.wikipedia.org/wiki/Function_pointer