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  1. #include <iostream>
  2.  
  3. struct pad {
  4.     int x;
  5.  
  6.     virtual ~pad() {}
  7. };
  8.  
  9. struct b {
  10.     int x;
  11. };
  12.  
  13. struct vb {
  14.     int x;
  15.  
  16.     virtual ~vb() {}
  17. };
  18.  
  19. struct d : pad, b, vb {};
  20.  
  21. void operator delete( void *p ) {
  22.     std::cout << "free " << p << '\n';
  23. }
  24.  
  25. int main() {
  26.     std::cout << "With virtual destructor:\n";
  27.     d *p = new d;
  28.     std::cout << "allocate " << p << ", delete " << static_cast< vb * >( p ) << '\n';
  29.     delete static_cast< vb * >( p );
  30.  
  31.     std::cout << "With plain destructor:\n";
  32.     p = new d;
  33.     std::cout << "allocate " << p << ", delete " << static_cast< b * >( p ) << '\n';
  34.     delete static_cast< b * >( p );
  35. }
  36.  
Success #stdin #stdout 0s 3028KB
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stdin
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Standard input is empty
stdout
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With virtual destructor:
allocate 0x8739008, delete 0x8739014
free 0x8739008
With plain destructor:
allocate 0x8739020, delete 0x8739028
free 0x8739028
https://ideone.com/ubOz9o
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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