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  1. #include <iostream>
  2. #include <functional>
  3. #include <math.h>
  4. using namespace std;
  5. template<class VarType>class Proxy{
  6.     VarType& Var;
  7.     typedef const VarType& CVarRef;
  8.     std::function<void(CVarRef)> Setter;
  9.     std::function<CVarRef()> Getter;
  10. public:
  11.     Proxy(VarType& Var,std::function<void(CVarRef Val)> Setter=nullptr,std::function<CVarRef()> Getter=nullptr):Var(Var),Setter(Setter),Getter(Getter){}
  12.     ~Proxy(){}
  13.     inline operator CVarRef()const{return Getter?Getter():Var;}
  14.     inline const Proxy& operator=(CVarRef NewValue)const{
  15.         if(Setter)Setter(NewValue);
  16.         else Var=NewValue;
  17.         return *this;
  18.     }
  19. };
  20. class Hero{
  21.     int _Exp;
  22.     int _Level;
  23. public:
  24.     // Variables.
  25.     Proxy<int> Exp;
  26.     Proxy<const int> Level;
  27.     // Constructor.
  28.     Hero(int StartingExp=0):_Exp(StartingExp),_Level(sqrt(StartingExp)),Exp(_Exp,bind(&Hero::SetExp,this,placeholders::_1)),Level(_Level){}
  29.     // Destructor.
  30.     ~Hero(){}
  31.     // Functions.
  32.     void SetExp(const int& NewExp){
  33.         _Exp=NewExp;
  34.         _Level=sqrt(NewExp);
  35.     }
  36.     // Function Pointers.
  37.     // Operators.
  38. };
  39. ostream& operator<<(ostream& stream,const Hero& rhs){
  40.     return stream<<"Hero of level "<<rhs.Level<<" with "<<rhs.Exp<<" exp.";
  41. }
  42.  
  43. int main(){
  44. 	Hero Bob;
  45. 	Bob.Exp=44;
  46. 	//Bob.Level=99;
  47. 	cout<<Bob<<endl;
  48. }
Success #stdin #stdout 0s 3476KB
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Standard input is empty
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Hero of level 6 with 0 exp.
https://ideone.com/Vrbt79
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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