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  1. #include <stdio.h>
  2.  
  3. void func(int m, int n) {
  4. 	printf("\tDo nothing good! %d\n", m + n);
  5. }
  6.  
  7. int main(void) {
  8. 	printf("Before:\n");
  9. 	func(1000, 2000);
  10. 	printf("Allowable operations:\n");
  11. 	((void (*)(void))func)();
  12. 	((void (*)(void))&func)();
  13. 	((void (*)(void))*func)();
  14. 	((void (*)(void))**func)();
  15. 	/*((void (*)(void))&&func)();  // no consecutive address-of, but logical*/
  16. 	((void (*)(void))&*func)();
  17. 	((void (*)(void))*&func)();
  18. 	((void (*)(void))&**func)();
  19. 	((void (*)(void))**&func)();
  20. 	((void (*)(void))*&**&***&func)();
  21. 	((void (*)(void))&*&**&***func)();
  22. 	printf("After:\n");
  23. 	func(-1, -2);
  24. 	return 0;
  25. }
  26.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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Before:
	Do nothing good! 3000
Allowable operations:
	Do nothing good! 0
	Do nothing good! 0
	Do nothing good! 0
	Do nothing good! 0
	Do nothing good! 0
	Do nothing good! 0
	Do nothing good! 0
	Do nothing good! 0
	Do nothing good! 0
	Do nothing good! 0
After:
	Do nothing good! -3
https://ideone.com/J1QyX5
Oddball-like function descriptor/pointer
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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