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<charconv> (C++17)

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(C++17)
 std::to_chars std::from_chars
() []
(C++17)
 std::from_chars
() []
(C++17)
 std::to_chars
() []

(C++17)
() []
(C++17)
() [] 

namespace std {
  //        
  enum class chars_format {
    scientific = /*   */,
    fixed = /*   */,
    hex = /*   */,
    general = fixed | scientific
  };


  //    
  struct to_chars_result { // 
    char* ptr;
    errc ec;
    friend bool operator==(const to_chars_result&, const to_chars_result&) = default;
    constexpr explicit operator bool() const noexcept { return ec == errc{}; }
  };

  constexpr
  // 
  to_chars_result to_chars(char* first, char* last,
                           /*   */ value, int base = 10);
  // 
  to_chars_result to_chars(char* first, char* last, bool value, int base = 10) = delete;
  //  
  to_chars_result to_chars(char* first, char* last, /*     */ value);
  //  
  to_chars_result to_chars(char* first, char* last, /*     */ value,
                           chars_format fmt);
  //  
  to_chars_result to_chars(char* first, char* last, /*     */ value,
                           chars_format fmt, int precision);

  //    
  struct from_chars_result { // 
    const char* ptr;
    errc ec;
    friend bool operator==(const from_chars_result&, const from_chars_result&) = default;
    constexpr explicit operator bool() const noexcept { return ec == errc{}; }
  };

  constexpr
  // 
  from_chars_result from_chars(const char* first, const char* last,
                               /*   */& value, int base = 10);
  //  
  from_chars_result from_chars(const char* first, const char* last,
                               /*     */& value,
                               chars_format fmt = chars_format::general);
}
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