# 1.0.0[−][src]Trait std::convert::AsMut

    pub trait AsMut<T> where
        T: ?Sized, {
        fn as_mut(&mut self) -> &mut T;
    }

A cheap, mutable reference-to-mutable reference conversion.

This trait is similar to `AsRef` but used for converting between mutable references.

Note: this trait must not fail. If the conversion can fail, use a dedicated method which returns an `Option<T>` or a `Result<T, E>`.

# Generic Implementations

- `AsMut` auto-dereferences if the inner type is a mutable reference (e.g.: `foo.as_mut()` will work the same if `foo` has type `&mut Foo` or `&mut &mut Foo`)

# Examples

`Box<T>` implements `AsMut<T>`:

    fn add_one<T: AsMut<u64>>(num: &mut T) {
        *num.as_mut() += 1;
    }

    let mut boxed_num = Box::new(0);
    add_one(&mut boxed_num);
    assert_eq!(*boxed_num, 1);Run

## Required methods

###
ⓘImportant traits for &'_ mut I

### Important traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`
`fn as_mut(&mut self) -> &mut T`

Performs the conversion.

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## Implementors

### `impl<'_, T, U> AsMut<U> for &'_ mut T where
T: AsMut<U> + ?Sized,
U: ?Sized,` [src]

####
ⓘImportant traits for &'_ mut I

### Important traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`
`fn as_mut(&mut self) -> &mut U`[src]

### `impl<T> AsMut<[T]> for [T; 0]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 1]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 2]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 3]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 4]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 5]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 6]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 7]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 8]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 9]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 10]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 11]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 12]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 13]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 14]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 15]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 16]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 17]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 18]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 19]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 20]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 21]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 22]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 23]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 24]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 25]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 26]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 27]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 28]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 29]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 30]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 31]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T; 32]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for [T]`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<[T]> for Vec<T>`[src]

####
ⓘImportant traits for &'a [u8]

### Important traits for &'a [u8]

`impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]`
`fn as_mut(&mut self) -> &mut [T]`[src]

### `impl<T> AsMut<Vec<T>> for Vec<T>`[src]

####
ⓘImportant traits for Vec<u8>

### Important traits for Vec<u8>

`impl Write for Vec<u8>`
`fn as_mut(&mut self) -> &mut Vec<T>`[src]

### `impl<T> AsMut<T> for Box<T> where
T: ?Sized,` [src]

####
ⓘImportant traits for &'_ mut I

### Important traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`
`fn as_mut(&mut self) -> &mut T`[src]

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