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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. class c1 {
  6. public:
  7.     void f1(){std::cout<<"In f1\n";}
  8. };
  9.  
  10. class c2 {
  11. public:
  12.     void f2(){std::cout<<"In f2\n";}
  13. };
  14.  
  15. template<typename> struct which_member;
  16.  
  17. template<> struct which_member<c1> {
  18.     static constexpr void (c1::* func)() = &c1::f1;	
  19. };
  20.  
  21. template<> struct which_member<c2> {
  22.     static constexpr void (c2::* func)() = &c2::f2;	
  23. };
  24.  
  25. template <typename T>
  26. class C: public c1, c2 {
  27. public:
  28.  
  29.     void f() {
  30.         (static_cast<T*>(this)->*which_member<T>::func)();
  31.     }
  32. };
  33.  
  34. int main()
  35. {
  36.     C<c2> c;
  37.     c.f();
  38.     return 0;
  39. }
Success #stdin #stdout 0s 15240KB
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Standard input is empty
stdout
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In f2
https://ideone.com/yzPM5K
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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