chars_format enum

Used with the <charconv> library to specify the floating-point format for primitive numerical conversions.

Syntax

enum class chars_format {
    scientific = unspecified,
    fixed = unspecified,
    hex = unspecified,
    general = fixed | scientific
};

Element	Description
`scientific`	Causes `from_chars()` to expect and parse an exponent. It is like the `printf()` format specifier `'e'`, which formats for scientific notation, like `"1.729e+01"`.
`fixed`	Causes `from_chars()` not to expect or parse an exponent. It is like the `printf()` format specifier `'f'`, which formats for floating-point, like `"17.29"`.
`hex`	Causes `from_chars()` to expect the number in hexadecimal format, but without a leading `0x`.
`general`	Causes `from_chars()` to accept (but not require) an exponent. For `to_chars()`, it is like the `printf()` format specifier `'g'`, which switches between scientific notation or fixed. It takes into consideration what the exponent will be so that it can generate reasonably compact output. For example: `1e-5` results in `"1e-05"`, but `1e-4` results in `"0.001"`. `1e5` results in `100000`, while `1e6` results in `1e+06`. `1e0` produces `1`.

For the from_chars functions, this enum describes what kind of input to expect. For the to_chars functions, it describes what kind of output to emit.

Header: <charconv>

Namespace: std

/std:c++17 or later is required.