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

    pub trait BorrowMut<Borrowed: ?Sized>: Borrow<Borrowed> {
        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

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

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

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

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

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

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

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