collections::str::Utf8Error
Struct collections::str::Utf8Error
pub struct Utf8Error { /* fields omitted */ }
Errors which can occur when attempting to interpret a sequence of u8 as a string.
As such, the from_utf8 family of functions and methods for both Strings and &strs make use of this error, for example.
Methods
impl Utf8Error
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fn valid_up_to(&self) -> usize1.5.0
Returns the index in the given string up to which valid UTF-8 was verified.
It is the maximum index such that from_utf8(&input[..index]) would return Ok(_).
Examples
Basic usage:
use std::str; // some invalid bytes, in a vector let sparkle_heart = vec![0, 159, 146, 150]; // std::str::from_utf8 returns a Utf8Error let error = str::from_utf8(&sparkle_heart).unwrap_err(); // the second byte is invalid here assert_eq!(1, error.valid_up_to());
fn error_len(&self) -> Option<usize>
Provide more information about the failure:
None: the end of the input was reached unexpectedly.self.valid_up_to()is 1 to 3 bytes from the end of the input. If a byte stream (such as a file or a network socket) is being decoded incrementally, this could be a validcharwhose UTF-8 byte sequence is spanning multiple chunks.Some(len): an unexpected byte was encountered. The length provided is that of the invalid byte sequence that starts at the index given byvalid_up_to(). Decoding should resume after that sequence (after inserting a U+FFFD REPLACEMENT CHARACTER) in case of lossy decoding.
Trait Implementations
impl Eq for Utf8Error
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impl Copy for Utf8Error
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impl Debug for Utf8Error
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fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>
Formats the value using the given formatter.
impl PartialEq<Utf8Error> for Utf8Error
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fn eq(&self, __arg_0: &Utf8Error) -> bool
This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, __arg_0: &Utf8Error) -> bool
This method tests for !=.
impl Clone for Utf8Error
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fn clone(&self) -> Utf8Error
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source. Read more
impl Display for Utf8Error
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fn fmt(&self, f: &mut Formatter) -> Result<(), Error>
Formats the value using the given formatter. Read more
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/collections/str/struct.Utf8Error.html
