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  1. #include <iostream>
  2.  
  3. // prints something; 
  4. // the template doesn't add anything
  5. template <typename T>
  6. struct Printer
  7. {
  8.     void print()
  9.     {
  10.         std::cout << "Printer::print" << std::endl;
  11.     }
  12. };
  13.  
  14. // this is an actual template
  15. // calls the method indicated by the second template argument
  16. // belonging to the class indicated by the first template argument
  17. template < typename U, void(U::*func)()>
  18. struct Caller
  19. {
  20.     void call(U obj)
  21.     {
  22.         (obj.*func)();
  23.     }
  24. };
  25.  
  26. // just a wrapper
  27. template<typename V>
  28. struct Wrapper
  29. {
  30.     void call_caller_on_printer()
  31.     {
  32.         Printer<int> a_printer;
  33.         Caller<Printer<int>, &Printer<int>::print> caller;
  34.         caller.call(a_printer);
  35.     }
  36. };
  37.  
  38. int main()
  39. {
  40.     Wrapper<int> the_wrapper;
  41.     the_wrapper.call_caller_on_printer();
  42.  
  43.     return 0;
  44. }
Success #stdin #stdout 0.02s 2724KB
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stdin
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Standard input is empty
stdout
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Printer::print
https://ideone.com/pR7y6
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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