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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. // -------------------------------------
  5. // Executer
  6. template <class T, class M0, class M1> class Executer {
  7. public:
  8.   void operator()(T &klass) {
  9.     cout << "execute: " << klass.i << endl;
  10.     M0()(klass);
  11.     M1()(klass);
  12.   }
  13. };
  14. // -------------------------------------
  15. // Method0
  16. template <class T> class Method0 {
  17. public:
  18.   void operator()(T &klass);
  19. };
  20. // -------------------------------------
  21. // CommonMethod1
  22. template <class T> class CommonMethod1 {
  23. public:
  24.   void operator()(T &klass) {
  25.     cout << "\tMethod1 for Klass0 and Klass1: " << klass.i << endl;
  26.   }
  27. };
  28.  
  29. // -------------------------------------
  30. // Klass0
  31. class Klass0 {
  32.   using this_t = Klass0;
  33.   using executer_t = Executer<this_t, Method0<this_t>, CommonMethod1<this_t>>;
  34.   friend executer_t;
  35.   friend class Method0<this_t>;
  36.   friend class CommonMethod1<this_t>;
  37.  
  38. public:
  39.   Klass0(int j) : i(j) {}
  40.   void execute() { executer_t()(*this); }
  41.  
  42. private:
  43.   int i;
  44. };
  45. // -------------------------------------
  46. // Method0<Klass0>
  47. template <> void Method0<Klass0>::operator()(Klass0 &klass) {
  48.   cout << "\tMethod0 for Klass0: " << klass.i << endl;
  49. }
  50.  
  51. // -------------------------------------
  52. // Klass1
  53. class Klass1 {
  54.   using this_t = Klass1;
  55.   using executer_t = Executer<this_t, Method0<this_t>, CommonMethod1<this_t>>;
  56.   friend executer_t;
  57.   friend class Method0<this_t>;
  58.   friend class CommonMethod1<this_t>;
  59.  
  60. public:
  61.   Klass1(int j) : i(j) {}
  62.   void execute() { executer_t()(*this); }
  63.  
  64. private:
  65.   int i;
  66. };
  67. // -------------------------------------
  68. // Method0<Klass1>
  69. template <> void Method0<Klass1>::operator()(Klass1 &klass) {
  70.   cout << "\tMethod0 for Klass1: " << klass.i << endl;
  71. }
  72.  
  73. // -------------------------------------
  74. int main() {
  75.   Klass0(0).execute();
  76.   Klass1(1).execute();
  77. }
  78.  
Success #stdin #stdout 0s 4320KB
comments (?)
stdin 
Standard input is empty
stdout 
execute: 0
	Method0 for Klass0: 0
	Method1 for Klass0 and Klass1: 0
execute: 1
	Method0 for Klass1: 1
	Method1 for Klass0 and Klass1: 1
https://ideone.com/CcRHnO
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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