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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3.  
  4. typedef struct{
  5. 	void(*Repaint)(void *);
  6. 	int X, Y;
  7. }  Component;
  8.  
  9. void *new_Component(int x, int y){
  10. 	Component *this = malloc(sizeof(Component));
  11. 	this->X = x;
  12. 	this->Y = y;
  13. 	return this;
  14. }
  15. void delete_Component(Component *this){
  16. 	free(this);
  17. }
  18.  
  19. typedef struct{
  20. 	Component *Base;
  21. 	const char *Text;
  22. } Label;
  23. void Label_Repaint(void *voidthis){
  24. 	Label *this = voidthis;
  25. 	Component *base = this->Base;
  26. 	printf("Label \"%s\" at {%d, %d}", this->Text, base->X, base->Y);
  27. }
  28. void *new_Label(int x, int y, const char *text){
  29. 	Label *this = malloc(sizeof(Label));
  30. 	this->Base = new_Component(x, y);
  31. 	this->Base->Repaint = Label_Repaint;
  32. 	this->Text = text;
  33. 	return this;
  34. }
  35. void delete_Label(Label *this){
  36. 	delete_Component(this->Base);
  37. 	free(this);
  38. }
  39.  
  40. int main(void){
  41. 	Label *l = new_Label(1, 2, "Patrick Bateman");
  42. 	l->Base->Repaint(l);
  43. 	delete_Label(l);
  44. 	return 0;
  45. }
  46.  
Success #stdin #stdout 0s 2424KB
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Standard input is empty
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Label "Patrick Bateman" at {1, 2}
https://ideone.com/s4SU03
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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