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  1. #include <iostream>
  2.  
  3.     struct fooA {
  4.     	int foo1(int x, int y) { return x + y; }
  5.     	int foo2(int x, double y, void*) { return x + y; }
  6. 	};
  7.     struct fooB {
  8.     	void foo1(int x, int y) { std::cout << "fooB(" << x << ", " << y << ")\n"; }
  9.     	void foo2(int x, double y, void* z) { std::cout << "fooB(" << x << ", " << y << ", " << z << ")\n"; }
  10.     };
  11.     struct fooC {
  12.     	void foo1(int x, int y) { std::cout << "fooC(" << x << ", " << y << ")\n"; }
  13.     	void foo2(int x, double y, void* z) { std::cout << "fooC(" << x << ", " << y << ", " << z << ")\n"; }
  14.     };
  15.  
  16.     class foo {
  17.     public:
  18.         void foo1(int x, int y)
  19.         {
  20.             dispatch(&fooA::foo1, &fooB::foo1, &fooC::foo1, x, y);
  21.         }
  22.         void foo2(int x, double y, void *z)
  23.         {
  24.             dispatch(&fooA::foo2, &fooB::foo2, &fooC::foo2, x, y, z);
  25.         }
  26.  
  27.     private:
  28.         template <typename... Args>
  29.         void dispatch(int (fooA::* f)(Args...),
  30.                       void (fooB::* g)(Args...),
  31.                       void (fooC::*h)(Args...),
  32.                       Args... args)
  33.         {
  34.            switch((m_Member.*f)(args...)) {
  35.            case 1: (m_Member1.*g)(args...); return;
  36.            case 2: (m_Member2.*h)(args...); return;
  37.            }
  38.         }
  39.  
  40.         fooA m_Member;
  41.         fooB m_Member1;
  42.         fooC m_Member2;
  43.     };
  44.  
  45. int main() {
  46. 	foo dispatcher;
  47. 	dispatcher.foo1(1, 0);
  48. 	dispatcher.foo2(1, 1, 0);
  49. 	return 0;
  50. }
Success #stdin #stdout 0s 3340KB
comments (?)
stdin
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Standard input is empty
stdout
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fooB(1, 0)
fooC(1, 1, 0)
https://ideone.com/VPuTyF
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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