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  1. #include <iostream>
  2.  
  3. struct NonTrivial
  4. {
  5.   int i = 5;
  6.   ~NonTrivial() { std::cout << "Destructor" << std::endl; }
  7. };
  8.  
  9. struct Trivial
  10. {
  11.   int i = 5;
  12. };
  13.  
  14. int main()
  15. {
  16.   NonTrivial *p = new NonTrivial[29];
  17.   std::cout << *((size_t *) p - 1) << std::endl;
  18.   std::cout << *((size_t *) p - 2) << std::endl;
  19.   std::cout << *((size_t *) p - 3) << std::endl << std::endl;
  20.  
  21.   Trivial *t = new Trivial[29];
  22.   std::cout << *((size_t *) t - 1) << std::endl;
  23.   std::cout << *((size_t *) t - 2) << std::endl;
  24.   std::cout << *((size_t *) t - 3) << std::endl << std::endl;
  25.  
  26.   int *q = new int[29];
  27.   std::cout << *((size_t *) q - 1) << std::endl;
  28.   std::cout << *((size_t *) q - 2) << std::endl;
  29.   std::cout << *((size_t *) q - 3) << std::endl << std::endl;
  30. }
  31.  
Success #stdin #stdout 0s 3456KB
comments (?)
stdin 
Standard input is empty
stdout 
29
129
0

121
0
5

121
5
5
https://ideone.com/1weAK4
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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