std::borrow::BorrowMut - Rust
Description: API documentation for the Rust `BorrowMut` trait in crate `std`.
Keywords: rust, rustlang, rust-lang, BorrowMut

# 1.0.0[−][src]Trait std::borrow::BorrowMut

    pub trait BorrowMut<Borrowed>: Borrow<Borrowed> where
        Borrowed: ?Sized, {
        fn borrow_mut(&mut self) -> &mut Borrowed;
    }

A trait for mutably borrowing data.

As a companion to `Borrow<T>` this trait allows a type to borrow as an underlying type by providing a mutable reference. See `Borrow<T>` for more information on borrowing as another type.

## Required methods

###
ⓘImportant traits for &'_ mut F

### Important traits for &'_ mut F

`impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, R: Read + ?Sized> Read for &'_ mut Rimpl<'_, W: Write + ?Sized> Write for &'_ mut W`
`fn borrow_mut(&mut self) -> &mut Borrowed`

Mutably borrows from an owned value.

# Examples

    use std::borrow::BorrowMut;

    fn check<T: BorrowMut<[i32]>>(mut v: T) {
        assert_eq!(&mut [1, 2, 3], v.borrow_mut());
    }

    let v = vec![1, 2, 3];

    check(v);Run

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## Implementors

### `impl BorrowMut<str> for String`[src]

#### `fn borrow_mut(&mut self) -> &mut str`[src]

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

####
ⓘImportant traits for &'_ mut F

### Important traits for &'_ mut F

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

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

####
ⓘImportant traits for &'_ [u8]

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

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

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

####
ⓘImportant traits for &'_ mut F

### Important traits for &'_ mut F

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

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

####
ⓘImportant traits for &'_ mut F

### Important traits for &'_ mut F

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

### `impl<const N: usize, T> BorrowMut<[T]> for [T; N] where
[T; N]: LengthAtMost32,` [src]

####
ⓘImportant traits for &'_ [u8]

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

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

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