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  1. #include <stdio.h>
  2.  
  3. #define REGISTER_CALLBACK(e,p) register_callback(e, (callback_void_t)p)
  4. #define GET_CALLBACK(e,T) ((T)callback_func_ptrs[e])
  5.  
  6. typedef void (*callback_s_char_t)(signed char);
  7. typedef void (*callback_void_t)(void);
  8.  
  9. typedef enum {
  10.     EVENT1,    
  11.     EVENT2,
  12.     MAX_EVENTS  
  13. } event_t;
  14.  
  15. callback_void_t callback_func_ptrs[MAX_EVENTS];
  16.  
  17. void event_func1(signed char direction) {
  18.     printf("success rotated: %d\n", direction);
  19. }
  20. void event_func2(void) {
  21.     printf("success button pressed\n");
  22. }
  23.  
  24. void register_callback(event_t event, callback_void_t ptr) {
  25.     callback_func_ptrs[event] = ptr;
  26. }
  27.  
  28. int main(void) {
  29.  
  30.     //register callback functions   
  31.     REGISTER_CALLBACK(EVENT1, event_func1);
  32.     REGISTER_CALLBACK(EVENT2, event_func2);
  33.  
  34.     //call callbacks
  35.     if(callback_func_ptrs[EVENT1])
  36.         GET_CALLBACK(EVENT1,callback_s_char_t)(1);
  37.  
  38.     if(callback_func_ptrs[EVENT2])
  39.         GET_CALLBACK(EVENT2,callback_void_t)();
  40.  
  41.     return 0;
  42. }
  43.  
Success #stdin #stdout 0s 4508KB
comments (?)
stdin 
Standard input is empty
stdout 
success rotated: 1
success button pressed
https://ideone.com/ZI0lfp
language:
C99 (gcc 8.3)
created:
7 years ago
visibility:
public

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