Trait encode_unicode::U8UtfExt [−] [src]

pub trait U8UtfExt {
    fn extra_utf8_bytes(self) -> Result<usize, InvalidUtf8FirstByte>;
    fn extra_utf8_bytes_unchecked(self) -> usize;
}

Methods for working with u8s as UTF-8 bytes.

Required Methods

`fn extra_utf8_bytes(self) -> Result<usize, InvalidUtf8FirstByte>`

How many more bytes will you need to complete this codepoint?

Errors

An error is returned if this is not a valid start of an UTF-8 codepoint: * 128..192: ContinuationByte * 240..: TooLongSequence

`fn extra_utf8_bytes_unchecked(self) -> usize`

How many more bytes will you need to complete this codepoint?

This function assumes that self is a valid UTF-8 start, and will return gibberish otherwize. The formula is self.not().leading_zeros().saturating_sub(1).

Implementors

impl U8UtfExt for u8