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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct point1d {
  5.     int x; 
  6.     void (*print)(void const *);
  7. };
  8.  
  9. struct point2d {
  10.     int x, y;
  11.     void (*print)(void const *);     
  12. };
  13.  
  14. void print_point1d( void const * p ) {
  15.     printf( "(%d)\n", ((struct point1d const*)p)->x );
  16. }
  17.  
  18. void print_point2d( void const * p ) {
  19.     printf( "(%d, %d)\n", ((struct point2d const*)p)->x, 
  20.                           ((struct point2d const*)p)->y );
  21. }
  22.  
  23. int main() {
  24.     struct point1d p1 = { .x=1, .print=&print_point1d };
  25.     struct point2d p2 = { .x=3, .y=4, .print=&print_point2d };
  26.  
  27.     p1.print( &p1 );
  28.     p2.print( &p2 );
  29. }
Success #stdin #stdout 0.01s 1720KB
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https://ideone.com/l5aix
language:
C99 (gcc 8.3)
created:
13 years ago
visibility:
public

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