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  1.     #include<iostream>
  2.     using namespace std;
  3.  
  4.     struct Abstract {
  5.             virtual void pure() = 0;
  6.             virtual void impure() { cout << " Abstract :: impure() " << endl; }
  7.             Abstract() {
  8.                     impure();
  9.                     pure(); // warning. technically undefined
  10.             }
  11.             ~Abstract() {
  12.                     impure();
  13.                     pure(); // warning. technically undefined
  14.             }
  15.     };
  16.     void Abstract :: pure() { cout << " Abstract :: pure()" << endl; }
  17.     struct X : public Abstract {
  18.             virtual void pure() { cout << " X :: pure() " << endl; }
  19.             virtual void impure() { cout << " X :: impure() " << endl; }
  20.     };
  21.     int main() {
  22.             X x;
  23.             x.pure();
  24.             x.impure();
  25.     }
Success #stdin #stdout 0.01s 2728KB
comments (?)
stdin 
Standard input is empty
stdout 
 Abstract :: impure() 
 Abstract :: pure()
 X :: pure() 
 X :: impure() 
 Abstract :: impure() 
 Abstract :: pure()
https://ideone.com/AVCPP
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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