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  1. #include <iostream>
  2. #include <iomanip>
  3.  
  4. using namespace std;
  5.  
  6. class Base
  7. {
  8. public:
  9.     Base()  { ptr = new int[100]; cout << "alloc mem at " << ptr << endl; }
  10.     ~Base() { delete [] ptr; cout << "free mem at " << ptr << endl; }
  11.     int * ptr;
  12. };
  13.  
  14. class Derived1
  15. {
  16. public:
  17.     Derived1(int x, int y):x(x),y(y){}
  18.     Derived1(int x)
  19.     {
  20.         new(this) Derived1(x,0);
  21.     }
  22.     int x, y;
  23.     Base b;
  24. };
  25.  
  26. class Derived2: public Base
  27. {
  28. public:
  29.     Derived2(int x, int y):x(x),y(y){}
  30.     Derived2(int x)
  31.     {
  32.         new(this) Derived2(x,0);
  33.     }
  34.     int x, y;
  35. };
  36.  
  37.  
  38. int main(int argc, const char * argv[])
  39. {
  40.     Derived1 d1(5);
  41.     Derived2 d2(5);
  42. }
  43.  
Success #stdin #stdout 0s 3468KB
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stdin
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Standard input is empty
stdout
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alloc mem at 0x9f6fa10
alloc mem at 0x9f6fba8
alloc mem at 0x9f6fd40
alloc mem at 0x9f6fed8
free mem at 0x9f6fed8
free mem at 0x9f6fba8
https://ideone.com/gkgi7S
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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