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  1. #include <iostream>
  2. #include <string>
  3. #include <boost/variant.hpp>
  4.  
  5. template <typename T>
  6. struct conversion_traits
  7. {
  8. 	typedef T type;
  9. };
  10.  
  11. template <>
  12. struct conversion_traits<const char*>
  13. {
  14. 	typedef std::string type;
  15. };
  16.  
  17. template <template <typename> class conv_traits, typename... Types>
  18. struct my_variant : public boost::variant<Types...>
  19. {
  20.     using boost::variant<Types...>::variant;
  21.  
  22. 	template <typename T>
  23.     auto operator=(T rhs)
  24.     {
  25.         return boost::variant<Types...>::operator=(static_cast<typename conv_traits<T>::type>(rhs));
  26.     }
  27. };
  28.  
  29. int main() 
  30. {
  31.     my_variant<conversion_traits, std::string, void const*> foo;
  32.     foo = "bar";
  33.     std::cout << foo.which(); 
  34.     return 0;
  35. }
Success #stdin #stdout 0s 3280KB
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https://ideone.com/AXUqTv
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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