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  1. //Fuente: http://w...content-available-to-author-only...p.com/cpp-tutorial/813-friend-functions-and-classes/
  2. #include<iostream>
  3. class Humidity;
  4.  
  5. class Temperature
  6. {
  7. private:
  8.     int m_temp;
  9. public:
  10.     Temperature(int temp=0) { m_temp = temp; }
  11.  
  12.     void setTemperature(int temp) { m_temp = temp; }
  13.  
  14.     friend void printWeather(const Temperature &temperature,
  15.         const Humidity &humidity);
  16. };
  17.  
  18. class Humidity
  19. {
  20. private:
  21.     int m_humidity;
  22. public:
  23.     Humidity(int humidity=0) { m_humidity = humidity; }
  24.  
  25.     void setHumidity(int humidity) { m_humidity = humidity; }
  26.  
  27.     friend void printWeather(const Temperature &temperature, 
  28.         const Humidity &humidity);
  29. };
  30.  
  31. void printWeather(const Temperature &temperature,
  32.     const Humidity &humidity)
  33. {
  34.     std::cout << "The temperature is " << temperature.m_temp <<
  35.        " and the humidity is " << humidity.m_humidity << '\n';
  36. }
  37.  
  38. int main()
  39. {
  40.     Humidity hum(10);
  41.     Temperature temp(12);
  42.  
  43.     printWeather(temp, hum);
  44.  
  45.     return 0;
  46. }
  47.  
  48.  
Success #stdin #stdout 0s 16064KB
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Standard input is empty
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The temperature is 12 and the humidity is 10
https://ideone.com/R7QCw0
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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