Trait std::borrow::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§


fn borrow_mut(&mut self) -> &mut Borrowed

Mutably borrows from an owned value.

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];



1.36.0 · source§

impl BorrowMut<str> for String

const: unstable · source§

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

const: unstable · source§

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


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,

1.4.0 (const: unstable) · source§

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