Function cras::from_chars(const ::std::string&, double&, const ::std::chars_format)

Function Documentation

inline ::std::from_chars_result cras::from_chars(const ::std::string &string, double &value, const ::std::chars_format fmt = ::std::chars_format::general) noexcept

Convert the given string to its best double representation. The behavior is similar to std::from_chars(), i.e. no leading space of plus sign is allowed.

Parameters:

  • string – [in] The string to convert.

  • value – [out] The parsed value (valid only if parsing succeeded, i.e. ec in the result is 0).

  • fmt – [in] Bitmask of std::chars_format values that specify the format rules with which the value should be interpreted. Not all formats have to be supported.

Returns:

Struct containing the error code ec - 0 on success, std::errc::invalid_argument if no number could be parsed, and std::errc::result_out_of_range if a numeric value was parsed but did not fit into a double. It is implementation specific, whether result_out_of_range or 0/inf will be returned for too small/large values. ptr points to the first character that was not parsed as a part of the numeric value.