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  1. #include <iostream>
  2. using namespace std;
  3.  
  4.  
  5. class Base {
  6. //no visitbility means private, not visible for derived
  7. protected:   // this is visible for derived, but not for outsiders
  8.     int x, y; 
  9. public:      // this is visible for everyone
  10.     virtual void readDataFromStream(istream&);
  11. };  
  12.  
  13. void Base::readDataFromStream(istream& is) {
  14.     //insert values from stream into attributes
  15.     is >> x;
  16.     is >> y;
  17.     cout <<"done-";
  18. }
  19.  
  20. class Derived :  Base {  // no inheritance visibility: outside world don't have access to base pubic members
  21.                          // if you want benefit from inheritance, make it Derived: public Base
  22.     //declaration
  23.     //method inherited from Base
  24.     int z; 
  25. public: 
  26.     void readDataFromStream(istream&) override;
  27.  
  28.     //definition - overrides definition in Base
  29.     //function called from inside function that passes file data into stream
  30.     //- stream already contains data
  31. };
  32.  
  33. void Derived::readDataFromStream(istream& is) {
  34.         //insert values from stream into attributes
  35.     Base::readDataFromStream(is); 
  36.     is >> z;
  37.     cout << "yes";
  38. }
  39.  
  40.  
  41.  
  42. int main() {
  43. 	// your code goes here
  44. 	Derived d; 
  45.  
  46. 	d.readDataFromStream(cin); 
  47. 	return 0;
  48. }
Success #stdin #stdout 0s 3416KB
comments (?)
stdin
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Standard input is empty
stdout
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done-yes
https://ideone.com/H9E8mE
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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