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. For evidence see the C99 specification (section 6.7.5.3.8).

"A declaration of a parameter as ‘‘function returning type’’ shall be adjusted to ‘‘pointer to function returning type’’, as in 6.3.2.1."