#include <stdio.h> #define auto __auto_type #define overload __attribute__((overloadable)) #define ms_abi __attribute__((ms_abi)) #define packed __attribute__((packed)) typedef enum packed { apple = 300, } Thing; overload void foo(int a) { printf("int: %i\n", a); } overload void foo(double a) { printf("double: %g\n", a); } overload void foo(char *a) { printf("char *: %s\n", a); } int main(void) { auto a = 3.05; auto b = 3; foo(a); foo(b); foo("hello"); foo((int)sizeof(Thing)); return 0; }