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  1. #include <cstddef>
  2. #include <string>
  3. #include <type_traits>
  4. #include <iostream>
  5.  
  6. namespace a {
  7. 	constexpr int operator""_x(const char *str, std::size_t size) {
  8.     	return size;
  9. 	}
  10. }
  11.  
  12. constexpr int f(const char* str)
  13. {
  14. 	return a::operator""_x(str, 3);
  15. 	// std::char_traits::length is constexpr since C++17
  16. }
  17.  
  18. int main()
  19. {
  20. 	const char *str = "333";
  21. 	using str_char_type = std::remove_const_t<std::remove_pointer_t<decltype(str)>>;
  22.  
  23. 	static_assert(std::is_same<
  24. 		char,
  25. 		str_char_type
  26. 	>::value, "err");
  27.  
  28. 	std::cout << f(str);
  29.  
  30. 	return 0;
  31. }
  32.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/iX4uPO
language:
C++14 (gcc 8.3)
created:
49 days ago
visibility:
public

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