# Standard library header <charconv>

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### Classes

chars_format (C++17) | specifies formatting for std::to_chars and std::from_chars (enum)

### Functions

from_chars (C++17) | converts a character sequence to an integer or floating-point value (function)
to_chars (C++17) | converts an integer or floating-point value to a character sequence (function)

### Synopsis

    namespace std {
      // floating-point format for primitive numerical conversion
      enum class chars_format {
        scientific = /*unspecified*/ ,
        fixed = /*unspecified*/ ,
        hex = /*unspecified*/ ,
        general = fixed | scientific
      };
      // primitive numerical output conversion
      struct to_chars_result {
        char* ptr;
        errc ec;
      };
      to_chars_result to_chars(char* first, char* last, /*see description*/ value, int base = 10);
      to_chars_result to_chars(char* first, char* last, float value);
      to_chars_result to_chars(char* first, char* last, double value);
      to_chars_result to_chars(char* first, char* last, long double value);
      to_chars_result to_chars(char* first, char* last, float value, chars_format fmt);
      to_chars_result to_chars(char* first, char* last, double value, chars_format fmt);
      to_chars_result to_chars(char* first, char* last, long double value, chars_format fmt);
      to_chars_result to_chars(char* first, char* last, float value,
                               chars_format fmt, int precision);
      to_chars_result to_chars(char* first, char* last, double value,
                               chars_format fmt, int precision);
      to_chars_result to_chars(char* first, char* last, long double value,
                               chars_format fmt, int precision);
      // primitive numerical input conversion
      struct from_chars_result {
        const char* ptr;
        errc ec;
      };
      from_chars_result from_chars(const char* first, const char* last,
                                   /*see description*/ & value, int base = 10);
      from_chars_result from_chars(const char* first, const char* last, float& value,
                                   chars_format fmt = chars_format::general);
      from_chars_result from_chars(const char* first, const char* last, double& value,
                                   chars_format fmt = chars_format::general);
      from_chars_result from_chars(const char* first, const char* last, long double& value,
                                   chars_format fmt = chars_format::general);
    }

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