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

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

Expand description

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

[src]

#### 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

## Implementations on Foreign Types

[src]

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

[src]

#### pub fn borrow_mut(&mut self) -> &mut T

1.4.0[src]

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

[src]

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

## Implementors

1.36.0[src]

### impl BorrowMut<str> for String

[src]

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

[src]

### impl<T> BorrowMut<T> for T where
T: ?Sized,

1.1.0[src]

### impl<T: ?Sized, A: Allocator> BorrowMut<T> for Box<T, A>