# Trait BorrowMut

1.0.0 · Source

    pub trait BorrowMut<Borrowed>: Borrow<Borrowed>where
        Borrowed: ?Sized,{
        // Required method
        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§

1.0.0 · Source

#### 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);

## Implementors§

1.36.0 · Source§

### impl BorrowMut<str> for String

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### impl BorrowMut<ByteStr> for ByteString

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### impl BorrowMut<[u8]> for ByteStr

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### impl BorrowMut<[u8]> for ByteString

1.0.0 · Source§

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

1.0.0 · Source§

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

1.0.0 · Source§

### impl<T, A> BorrowMut<[T]> for Vec<T, A>
where A: Allocator,

1.1.0 · Source§

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

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

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

1.4.0 · Source§

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