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  1. #include <iostream>
  2. #include <sstream>
  3. #include <string>
  4.  
  5. struct printable
  6. {
  7. 	template <typename T>
  8. 	printable(T const* value)
  9. 		: data_(value), to_string_impl_(&printable::to_string_impl<T>)
  10. 	{}
  11.  
  12. 	std::string to_string() const
  13. 	{
  14. 		return to_string_impl_(data_);
  15. 	}
  16.  
  17. private:
  18. 	void const* data_;
  19. 	std::string (* to_string_impl_) ( void const*);
  20.  
  21. 	template <typename T>
  22. 	static std::string to_string_impl(void const* data)
  23. 	{
  24. 		std::ostringstream oss;
  25. 		oss << *static_cast<T const*>(data);
  26. 		return oss.str();
  27. 	}
  28. };
  29.  
  30. int main()
  31. {
  32. 	int i = 42;
  33. 	double d = 3.14;
  34.  
  35. 	printable a(&i), b(&d);
  36.  
  37. 	std::cout << "i: " << a.to_string() << '\n';
  38. 	std::cout << "d: " << b.to_string() << '\n';
  39. }
Success #stdin #stdout 0s 3020KB
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stdin
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Standard input is empty
stdout
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i: 42
d: 3.14
https://ideone.com/VFfDa8
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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