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  1. #include <iostream>
  2.  
  3. struct S
  4. {
  5. 	int data;
  6. 	S* pair;
  7.  
  8. 	void print() const
  9. 	{
  10. 		std::cout << "data:" << data << " pair data:" << pair->data << std::endl;
  11. 	}
  12. };
  13.  
  14.  
  15. int main() {
  16.  
  17. 	S* s = static_cast<S*>( malloc(sizeof(S)*2) );
  18.  
  19. 	void* p = malloc(100);
  20. 	*static_cast<int*>(p) = 100500;
  21.  
  22. 	s[0].data = 1;
  23. 	s[1].data = 2;
  24. 	s[0].pair = &s[1];
  25. 	s[1].pair = &s[0];
  26.  
  27. 	s[0].print();
  28. 	s[1].print();
  29.  
  30. 	S* news = static_cast<S*>( realloc( s, sizeof(S)*3 ) );
  31. 	if( news )
  32. 	{
  33. 		std::cout << s << " : " << news << std::endl;
  34. 		s = news;
  35. 	}
  36.  
  37. 	std::cout << "after realloc\n";
  38.  
  39. 	s[0].print();
  40. 	s[1].print();
  41.  
  42. 	return 0;
  43. }
Success #stdin #stdout 0s 3428KB
comments (?)
stdin
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Standard input is empty
stdout
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data:1 pair data:2
data:2 pair data:1
0x8d94008 : 0x8d94088
after realloc
data:1 pair data:2
data:2 pair data:0
https://ideone.com/5nLv1B
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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