Standard library header <charconv>

Classes

(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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Technical Specifications