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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. typedef int (*ptr1)(int, int);
  5. int add1(int a, int b){return a+b;}
  6.  
  7. typedef double (*ptr2)(double, double, double);
  8. double add2(double a, double b, double c){return a+b+c;}
  9.  
  10. template <typename TResult>
  11. class executor{
  12.     class executable;
  13.  
  14.     template<typename T1, typename T2, typename Func>
  15.     class _e2;
  16. public:
  17.     template <typename T1, typename T2, typename Func>
  18.     executor(T1 arg1, T2 arg2, Func f) : e(new _e2<T1,T2,Func>(arg1, arg2, f)){}
  19.  
  20.     template <typename T1, typename T2, typename T3, typename Func>
  21.     executor(T1 arg1, T2 arg2, T3 arg3, Func f) : e(new _e3<T1,T2,T3,Func>(arg1, arg2, arg3, f)){}
  22.  
  23.  
  24.     TResult execute() {return e->execute();}
  25. private:
  26.     executable *e;
  27. private:
  28.     class executable{
  29.     public:
  30.         virtual TResult execute() = 0;
  31.     };
  32.  
  33.     template<typename T1, typename T2, typename Func>
  34.     class _e2 : public executable{
  35.     public:
  36.         _e2(T1 arg1, T2 arg2, Func f) : _arg1(arg1), _arg2(arg2), _f(f) {}
  37.     public:
  38.         TResult execute() {return _f(_arg1, _arg2);}
  39.     private:
  40.         T1 _arg1;
  41.         T2 _arg2;
  42.         Func _f;
  43.     };
  44.  
  45.     template<typename T1, typename T2, typename T3, typename Func>
  46.     class _e3 : public executable{
  47.     public:
  48.         _e3(T1 arg1, T2 arg2, T3 arg3, Func f) : _arg1(arg1), _arg2(arg2), _arg3(arg3), _f(f) {}
  49.     public:
  50.         TResult execute() {return _f(_arg1, _arg2, _arg3);}
  51.     private:
  52.         T1 _arg1;
  53.         T2 _arg2;
  54.         T3 _arg3;
  55.         Func _f;
  56.     };
  57. };
  58.  
  59.  
  60. int main()
  61. {
  62.     executor<int> etor(1, 1, add1);
  63.     cout << etor.execute() << endl;
  64.  
  65.     executor<double> etor2(1.0, 1.0, 1.0, add2);
  66.     cout << etor2.execute() << endl;
  67.  
  68.     return 0;
  69. }
  70.  
Success #stdin #stdout 0.01s 2856KB
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https://ideone.com/hFi8p
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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