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

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

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

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` 1.36.0[src]

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

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

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

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

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

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

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

### `impl<T, const N: usize> BorrowMut<[T]> for [T; N]`1.4.0[src]

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

### `impl<T: ?Sized, A: Allocator> BorrowMut<T> for Box<T, A>`1.1.0[src]

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

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