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  1. #include <iostream>
  2. #include <functional>
  3. using namespace std;
  4.  
  5. template <typename T>
  6. class Property{
  7. 	private:
  8.  
  9. 	T val;
  10.  
  11. 	std::function<void(T& v,const T& newV)> setFN = nullptr;
  12.  
  13. 	public:
  14.  
  15. 	void setter(decltype(setFN) newSetter){
  16. 		setFN = newSetter;
  17. 	}
  18.  
  19. 	void set(const T& newVal){
  20. 		if(!setFN)
  21. 			val = newVal;
  22. 		else
  23. 			setFN(val,newVal);
  24. 	}
  25.  
  26. 	T get(){
  27. 		return val;
  28. 	}
  29. };
  30.  
  31. int main() {
  32.  
  33. 	Property<int> x;
  34.  
  35. 	x.set(5);
  36. 	std::cout << x.get() << std::endl;
  37.  
  38. 	x.setter([](int& v, const int& newV){std::cout << "Setter called\n"; v=newV;});
  39.  
  40. 	x.set(2);
  41. 	std::cout << x.get() << std::endl;
  42. 	// your code goes here
  43. 	return 0;
  44. }
Success #stdin #stdout 0s 3412KB
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stdin
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Standard input is empty
stdout
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5
Setter called
2
https://ideone.com/jmNSSf
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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