In C, what is the difference between `&function` and `function` when passed as arguments?

Question

For example:

#include 

typedef void (* proto_1)();
typedef void proto_2();

void my_function(int j){
    printf(\"hello from function. I got          


        

Answer 1

there is no difference between &function and function when passing as arguement

however there is a difference between your typedefs. I do not know the official explanation, i.e what exactly the difference, but from what i remember

typedef void (*name1)(void);

and

typedef void(name2)(void);

are different:

name1 is a pointer to a function that takes no paramter and returns nothing

name2 is a function that takes no paramter and returns nothing

you can test it by compiling:

typedef void (*pointer)(void);
typedef void (function)(void);

void foo(void){}

int main()
{
    pointer p;
    function f;

    p = foo; //compiles
    p();

    f = foo; //does not compile
    f();
}

again, i am not the right person to explain exact reason of this behavior but i believe if you take a look at standards you will find the explanation somewhere there