Struct bumpalo::collections::string::FromUtf8Error [−][src]
pub struct FromUtf8Error<'bump> { /* fields omitted */ }Expand description
A possible error value when converting a String from a UTF-8 byte vector.
This type is the error type for the from_utf8 method on String. It
is designed in such a way to carefully avoid reallocations: the
into_bytes method will give back the byte vector that was used in the
conversion attempt.
The Utf8Error type provided by std::str represents an error that may
occur when converting a slice of u8s to a &str. In this sense, it’s
an analogue to FromUtf8Error, and you can get one from a FromUtf8Error
through the utf8_error method.
Examples
Basic usage:
use bumpalo::{Bump, collections::String};
let b = Bump::new();
// some invalid bytes, in a vector
let bytes = bumpalo::vec![in &b; 0, 159];
let value = String::from_utf8(bytes);
assert!(value.is_err());
assert_eq!(bumpalo::vec![in &b; 0, 159], value.unwrap_err().into_bytes());Implementations
Returns a slice of u8s bytes that were attempted to convert to a String.
Examples
Basic usage:
use bumpalo::{Bump, collections::String};
let b = Bump::new();
// some invalid bytes, in a vector
let bytes = bumpalo::vec![in &b; 0, 159];
let value = String::from_utf8(bytes);
assert_eq!(&[0, 159], value.unwrap_err().as_bytes());Returns the bytes that were attempted to convert to a String.
This method is carefully constructed to avoid allocation. It will consume the error, moving out the bytes, so that a copy of the bytes does not need to be made.
Examples
Basic usage:
use bumpalo::{Bump, collections::String};
let b = Bump::new();
// some invalid bytes, in a vector
let bytes = bumpalo::vec![in &b; 0, 159];
let value = String::from_utf8(bytes);
assert_eq!(bumpalo::vec![in &b; 0, 159], value.unwrap_err().into_bytes());Fetch a Utf8Error to get more details about the conversion failure.
The Utf8Error type provided by std::str represents an error that may
occur when converting a slice of u8s to a &str. In this sense, it’s
an analogue to FromUtf8Error. See its documentation for more details
on using it.
Examples
Basic usage:
use bumpalo::{Bump, collections::String};
let b = Bump::new();
// some invalid bytes, in a vector
let bytes = bumpalo::vec![in &b; 0, 159];
let error = String::from_utf8(bytes).unwrap_err().utf8_error();
// the first byte is invalid here
assert_eq!(1, error.valid_up_to());