Struct bumpalo::collections::string::FromUtf8Error
source · pub struct FromUtf8Error<'bump> { /* private fields */ }
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 u8
s 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§
source§impl<'bump> FromUtf8Error<'bump>
impl<'bump> FromUtf8Error<'bump>
sourcepub fn as_bytes(&self) -> &[u8]
pub fn as_bytes(&self) -> &[u8]
Returns a slice of 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());
sourcepub fn into_bytes(self) -> Vec<'bump, u8>
pub fn into_bytes(self) -> Vec<'bump, u8>
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());
sourcepub fn utf8_error(&self) -> Utf8Error
pub fn utf8_error(&self) -> Utf8Error
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 u8
s 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());