Trait encode_unicode::U8UtfExt
source · [−]pub trait U8UtfExt {
fn extra_utf8_bytes(self) -> Result<usize, Utf8Error>;
fn extra_utf8_bytes_unchecked(self) -> usize;
}
Expand description
Methods for working with u8
s as UTF-8 bytes.
Required Methods
fn extra_utf8_bytes(self) -> Result<usize, Utf8Error>
fn extra_utf8_bytes(self) -> Result<usize, Utf8Error>
How many more bytes will you need to complete this codepoint?
Errors
An error is returned if the byte is not a valid start of an UTF-8 codepoint:
128..192
:UnexpectedContinuationByte
245..
,192
and193
:NonUtf8Byte
fn extra_utf8_bytes_unchecked(self) -> usize
fn extra_utf8_bytes_unchecked(self) -> usize
How many more bytes will you need to complete this codepoint?
This function assumes that the byte is a valid UTF-8 start, and might return any value otherwise. (but the function is safe to call with any value and will return a consistent result).