fork(2) download
copy 
  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. #include <boost/tti/has_member_function.hpp>
  5. #include <boost/function_types/result_type.hpp>
  6.  
  7. struct Interface
  8. {
  9.     std::string interface()const
  10.     {
  11.         return "interface";
  12.     }
  13. };
  14.  
  15. struct my_interface
  16. {
  17.     std::string get_my_interface()const
  18.     {
  19.         return "get_my_interface";
  20.     }
  21. };
  22.  
  23. struct myInterfaceType
  24. {
  25.     std::string myInterface()const
  26.     {
  27.         return "myInterface";
  28.     }
  29. };
  30.  
  31. namespace foo
  32. {
  33. namespace detail
  34. {
  35.     BOOST_TTI_HAS_MEMBER_FUNCTION(interface)
  36.     BOOST_TTI_HAS_MEMBER_FUNCTION(get_my_interface)
  37.     BOOST_TTI_HAS_MEMBER_FUNCTION(myInterface)
  38. }
  39.  
  40. template<typename Interface>
  41. struct GenericInterface
  42. {
  43.     template<typename T = Interface>
  44.     typename std::enable_if<  detail::has_member_function_interface<std::string (T::*)()const>::value,std::string >::type  query_interface()const
  45.     {
  46.         return i.interface();
  47.     }
  48.     template<typename T = Interface>
  49.     typename std::enable_if<  detail::has_member_function_get_my_interface<std::string (T::*)()const >::value, std::string>::type query_interface()const
  50.     {
  51.         return i.get_my_interface();
  52.     }
  53.     template<typename T = Interface>
  54.     typename std::enable_if< detail::has_member_function_myInterface<std::string (T::*)()const >::value, std::string >::type query_interface()const
  55.     {
  56.         return i.myInterface();
  57.     }
  58.     void print()
  59.     {
  60.         std::cout << query_interface() << "\n";
  61.     }
  62.  
  63. private:
  64.     Interface i;
  65. };
  66. }
  67.  
  68. int main(int argc, char *argv[])
  69. {
  70.     foo::GenericInterface<Interface> gInterface;
  71.     foo::GenericInterface<my_interface> gmy_interface;
  72.     foo::GenericInterface<myInterfaceType> gmyInterface;
  73.  
  74.     gInterface.print();
  75.     gmy_interface.print();
  76.     gmyInterface.print();
  77.  
  78.     std::cout << std::boolalpha <<foo::detail::has_member_function_get_my_interface<std::string (my_interface::*)()const>::value << std::endl;
  79.     std::cout << std::boolalpha <<foo::detail::has_member_function_interface<myInterfaceType,std::string>::value << std::endl;
  80.     std::cout << std::boolalpha << foo::detail::has_member_function_interface<std::string (Interface::*)()const>::value << std::endl;
  81.  
  82.     static_assert(foo::detail::has_member_function_interface<std::string (Interface::*)()const>::value,"fail");
  83.  
  84.     std::cout << "Hello World!" << std::endl;
  85.     return 0;
  86. }
  87.  
Success #stdin #stdout 0s 3456KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
interface
get_my_interface
myInterface
true
false
true
Hello World!
https://ideone.com/zTzwIL
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!