std::str::Utf8Error - Rust
Description: API documentation for the Rust `Utf8Error` struct in crate `std`.
Keywords: rust, rustlang, rust-lang, Utf8Error

# Struct std::str::Utf8Error 1.0.0 [−] [src]

    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 `String`s and `&str`s make use of this error, for example.

## Methods

### `impl Utf8Error`
[src]

#### `fn valid_up_to(&self) -> usize`
1.5.0

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());Run

## Trait Implementations

### `impl Copy for Utf8Error`
[src]

### `impl PartialEq<Utf8Error> for Utf8Error`
[src]

#### `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 Display for Utf8Error`
[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`

Formats the value using the given formatter.

### `impl Clone for Utf8Error`
[src]

#### `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 Debug for Utf8Error`
[src]

#### `fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>`

Formats the value using the given formatter.

### `impl Eq for Utf8Error`
[src]

### `impl Error for Utf8Error`
[src]

#### `fn description(&self) -> &str`

A short description of the error. Read more

#### `fn cause(&self) -> Option<&Error>`

The lower-level cause of this error, if any. Read more

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
⇤
  Move up in search results
⇥
  Move down in search results
⏎
  Go to active search result
+
  Collapse/expand all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)