dtoa: float64 to chars

Functions
size_t	c4::dtoa (substr str, double v, int precision=-1, RealFormat_e formatting=FTOA_FLEX) noexcept
	Convert a double-precision real number to string. More...

Detailed Description

Function Documentation

size_t c4::dtoa ( substr  str, double  v, int  precision = -1, RealFormat_e  formatting = FTOA_FLEX  )

inlinenoexcept

Convert a double-precision real number to string.

The string will in general be NOT null-terminated. For FTOA_FLEX, precision is the number of significand digits. Otherwise precision is the number of decimals. It is safe to call this function with an empty or too-small buffer.

Returns

the size of the buffer needed to write the number

Definition at line 2097 of file charconv.hpp.

Referenced by c4::to_chars(), and c4::xtoa().

{
#if C4CORE_HAVE_STD_TOCHARS
    return detail::rtoa(str, v, precision, formatting);
#else
    char fmt[16];
    detail::get_real_format_str(fmt, precision, formatting, /*length_modifier*/"l");
    return detail::print_one(str, fmt, v);
#endif
}