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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct ILogger {
  5.     virtual ~ILogger() {}
  6.     virtual void log(string m) = 0;
  7. };
  8.  
  9. class Car {
  10.     ILogger* logger;
  11.  
  12. public:
  13.     explicit Car(ILogger* l)
  14.         : logger(l) {
  15.  
  16.     }
  17.  
  18.     void drive() {
  19.         logger->log("driving is so good");
  20.     }
  21. };
  22.  
  23. class Trailer : public Car, private ILogger {
  24. public:
  25.     Trailer() : Car(this) {
  26.  
  27.     }
  28.  
  29.     void unpack() {
  30.         log("unpacking trailer");
  31.     }
  32.  
  33.     void log(string m) override {
  34.         // putting record in our journal
  35.         cout << "[trailer journal]: " << m << endl;
  36.     }
  37. };
  38.  
  39. int main() {
  40.     Trailer t;
  41.     t.unpack();
  42.     // it's time to move
  43.     t.drive();
  44.  
  45.     return 0;
  46. }
Success #stdin #stdout 0s 15240KB
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Standard input is empty
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[trailer journal]: unpacking trailer
[trailer journal]: driving is so good
https://ideone.com/8cDrRG
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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