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  1. #include <iostream>
  2. #include <functional>
  3. using namespace std;
  4.  
  5. class led {
  6. private: 
  7. 	int id; 
  8. 	static int nextid; 
  9. public:  
  10.     led() { id=++nextid; }
  11.     int get_id() { return id; }
  12. 	void turn_on() { cout<<"Turn on led "<<id<<endl; }
  13. 	void turn_off() { cout<<"Turn off led "<<id<<endl; }
  14. };
  15. class blinking_led : public led {
  16. public:
  17. 	void blink() { cout<<"Blink "<<get_id()<<endl; cout<<"  ->"; turn_on();cout<<"  ->"; turn_off();}
  18. };
  19. class auto_switch{
  20. 	std::function<void()> action; 
  21. public: 
  22. 	auto_switch(function<void()>a) : action(a) {}
  23. 	void go	() { action(); }
  24. }; 
  25.  
  26. int led::nextid=0; 
  27.  
  28. int main() {
  29. 	led l1; 
  30. 	blinking_led l2; 
  31. 	l1.turn_on(); l1.turn_off(); 
  32. 	l2.blink(); 
  33. 	auto_switch s(bind(&led::turn_off, l1));
  34. 	s.go(); 
  35. 	auto_switch s2(bind(&blinking_led::blink, l2));
  36. 	s2.go(); 
  37.  
  38. 	return 0;
  39. }
Success #stdin #stdout 0s 4524KB
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stdin
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Standard input is empty
stdout
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Turn on led 1
Turn off led 1
Blink 2
  ->Turn on led 2
  ->Turn off led 2
Turn off led 1
Blink 2
  ->Turn on led 2
  ->Turn off led 2
https://ideone.com/Kz5LqC
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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