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GeezerVison is showing doc.rust-lang.org — BorrowMut in std::borrow - Rust

std::borrow

Trait BorrowMut 

1.0.0 (const: unstable) · 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 (const: unstable) · 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);

Dyn Compatibility§

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§

Source§

impl BorrowMut<ByteStr> for ByteString

Source§

impl BorrowMut<[u8]> for ByteStr

Source§

impl BorrowMut<[u8]> for ByteString

1.36.0 · Source§

impl BorrowMut<str> for String

1.1.0 · Source§

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

Source§

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

Source§

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

1.0.0 · Source§

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

1.4.0 (const: unstable) · Source§

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

1.0.0 (const: unstable) · Source§

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

1.0.0 (const: unstable) · Source§

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

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