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  1. #include <type_traits>
  2. #include <string>
  3. #include <iostream>
  4.  
  5. // Данные
  6. struct Base
  7. {};
  8.  
  9. struct A : Base
  10. {
  11.     std::string name = "A";
  12. };
  13.  
  14. struct B : Base
  15. {
  16.     std::string name = "B";
  17. };
  18.  
  19. // Геттеры
  20. template< typename T >
  21. struct Meta
  22. {
  23.     static_assert(std::is_base_of<Base, T>::value, "");
  24.  
  25.     public:
  26.     explicit Meta( const T& data )
  27.         : _data{ data }
  28.     {}
  29.  
  30.     std::string name() const
  31.     {
  32.         return "Name is: " + _data.name;
  33.     }
  34.  
  35.     const T* operator->() const
  36.     {
  37.         return &_data;
  38.     }
  39.  
  40. private:
  41.     const T& _data;
  42. };
  43.  
  44. template< typename T >
  45. Meta<T> Wrap( const T& data )
  46. {
  47.     return Meta<T>{ data };
  48. }
  49.  
  50.  
  51. int main()
  52. {
  53.     const A a;
  54.     const B b;
  55.     const auto wa = Wrap( a );
  56.     const auto wb = Wrap( b );
  57.  
  58.     std::cout << wa.name() << "\n";
  59.     std::cout << wb.name() << "\n";
  60.  
  61.     //for ( const auto& meta : { wa, wb } )
  62.     //    std::cout << meta.name() << "\n";
  63.  
  64.     return 0;
  65. }
Success #stdin #stdout 0s 16064KB
comments (?)
stdin 
Standard input is empty
stdout 
Name is: A
Name is: B
https://ideone.com/CAO5DS
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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