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  1. #include <iostream>
  2.  
  3. struct base
  4. {
  5.     base() { foo() ; } // calls base::foo()
  6.     virtual ~base() { foo() ; } // calls base::foo()
  7.  
  8.     virtual void foo() const { std::cout << "base::foo\n" ; }
  9.     void bar() { foo() ; } // calls ???::foo
  10. };
  11.  
  12. struct derived : base
  13. {
  14.     derived() { foo() ; } // calls derived::foo()
  15.     virtual ~derived() override { foo() ; } // calls derived::foo()
  16.     virtual void foo() const override { std::cout << "derived::foo\n" ; }
  17. };
  18.  
  19. int main()
  20. {
  21.     {
  22.         derived d ;
  23.         // constructor of base class
  24.         // base constructor calls foo => base::foo
  25.         // constructor of derived class
  26.         // derived constructor calls foo => derived::foo
  27.  
  28.         base& b = d ;
  29.         b.bar() ;
  30.         // calls base::bar()
  31.         // base::bar calls foo() polymorphically => derived::foo
  32.  
  33.     } // the life-time of d is over at this point
  34.       // destructor of derived class
  35.       // derived destructor calls foo => derived::foo
  36.       // destructor of base class
  37.       // base destructor calls foo => base::foo
  38. }
  39.  
Success #stdin #stdout 0s 3340KB
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stdin
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Standard input is empty
stdout
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base::foo
derived::foo
derived::foo
derived::foo
base::foo
https://ideone.com/3bStA3
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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