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  1. #include <iostream>
  2. #include <string>
  3.  
  4. struct Base
  5. {
  6.     std::string s = "acid";
  7.     virtual ~Base(){}
  8.     virtual void Print() const
  9.     {
  10.         std::cout << "Base: " << s << std::endl;
  11.     }
  12. };
  13.  
  14. struct Derived : Base
  15. {
  16.     Derived(){ Base::s = "neutral"; }
  17.     virtual ~Derived(){}
  18.     virtual void Print() const
  19.     {
  20.         std::cout << "Derived: " << Base::s << std::endl;
  21.     }
  22. };
  23.  
  24. int main()
  25. {
  26.     std::cout << "sizeof(Base) = " << sizeof(Base) << std::endl;
  27.     std::cout << "sizeof(Derived) = " << sizeof(Derived) << std::endl;
  28.  
  29.     Base *r1 = new Base;
  30.     Base *r2 = new Derived;
  31.  
  32.     r1->Print();
  33.     r2->Print();
  34.  
  35.     r1->~Base();
  36.     r2->~Base();
  37.     new ((void*)r1) Derived;
  38.     new ((void*)r2) Base;
  39.  
  40.     r1->Print();
  41.     r2->Print();
  42.  
  43.     delete r1;
  44.     delete r2;
  45. }
Success #stdin #stdout 0s 3032KB
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stdin
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Standard input is empty
stdout
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sizeof(Base) = 8
sizeof(Derived) = 8
Base: acid
Derived: neutral
Derived: neutral
Base: acid
https://ideone.com/GLb0hb
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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