C function pointer typedef example (for nicer variable declarations).

funky_typedef.c

/*
I have read a bunch of posts about function pointers,
such as http://denniskubes.com/2013/03/22/basics-of-function-pointers-in-c/
but I rarely see this *one weird trick*.

It is C's (admittedly clunky) syntax for typedefing a function pointer of a given signiature.
Hide the clunkiness in the typedef to keep your code tidy and maintainable.
*/

#include <stdio.h>

/* Syntax: typedef return_type (*name_of_typedef) (parameter_types) */
typedef void (*foo_fun) (int);

/* Here is a function with the same calling signature as a foo_fun we typedefed: */
void foo(int i) {
  printf("hello %dth cruel world\n", i);
}

int main() {
  /* The following line would otherwise be: void (*foo_fun)(int) my_foo = foo; */
  foo_fun my_foo = foo;
  my_foo(7);
}

This takes me back down memory lane to 1994 :-)

@tseemann Haha :D I didn't know much C back then (actually, none). My brothers showed me this in my first year of uni ^^