1.0.0[−][src]Struct alloc::string::FromUtf8Error
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:
// some invalid bytes, in a vector let bytes = vec![0, 159]; let value = String::from_utf8(bytes); assert!(value.is_err()); assert_eq!(vec![0, 159], value.unwrap_err().into_bytes());
Methods
impl FromUtf8Error
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pub fn as_bytes(&self) -> &[u8]
1.26.0[src]
Returns a slice of u8
s bytes that were attempted to convert to a String
.
Examples
Basic usage:
// some invalid bytes, in a vector let bytes = vec![0, 159]; let value = String::from_utf8(bytes); assert_eq!(&[0, 159], value.unwrap_err().as_bytes());
pub fn into_bytes(self) -> Vec<u8>
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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:
// some invalid bytes, in a vector let bytes = vec![0, 159]; let value = String::from_utf8(bytes); assert_eq!(vec![0, 159], value.unwrap_err().into_bytes());
pub fn utf8_error(&self) -> Utf8Error
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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:
// some invalid bytes, in a vector let bytes = vec![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());
Trait Implementations
impl Display for FromUtf8Error
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impl Debug for FromUtf8Error
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Auto Trait Implementations
impl Send for FromUtf8Error
impl Sync for FromUtf8Error
Blanket Implementations
impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for T
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,