std::chars_format
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header  <charconv>
  | 
||
|   enum class chars_format {     scientific = /*unspecified*/,  | 
(since C++17) | |
A BitmaskType used to specify floating-point formatting for std::to_chars and std::from_chars.
Notes
| Feature-test macro | Value | Std | Feature | 
|---|---|---|---|
__cpp_lib_to_chars | 
201611L | (C++17) | Elementary string conversions (std::to_chars, std::from_chars) | 
Example
| This section is incomplete Reason: no example  | 
See also
|    (C++17)  | 
  converts an integer or floating-point value to a character sequence  (function)  | 
|    (C++17)  | 
  converts a character sequence to an integer or floating-point value  (function)  |