pub struct RefMut<'b, T> where T: 'b + ?Sized, { /* fields omitted */ }
A wrapper type for a mutably borrowed value from a RefCell<T>.
See the module-level documentation for more.
impl<'b, T> RefMut<'b, T> where
T: ?Sized, [src]
pub fn map<U, F>(orig: RefMut<'b, T>, f: F) -> RefMut<'b, U> where
F: FnOnce(&mut T) -> &mut U,
U: ?Sized, [src]1.8.0
Makes a new RefMut for a component of the borrowed data, e.g., an enum variant.
The RefCell is already mutably borrowed, so this cannot fail.
This is an associated function that needs to be used as RefMut::map(...). A method would interfere with methods of the same name on the contents of a RefCell used through Deref.
use std::cell::{RefCell, RefMut};
let c = RefCell::new((5, 'b'));
{
let b1: RefMut<(u32, char)> = c.borrow_mut();
let mut b2: RefMut<u32> = RefMut::map(b1, |t| &mut t.0);
assert_eq!(*b2, 5);
*b2 = 42;
}
assert_eq!(*c.borrow(), (42, 'b'));pub fn map_split<U, V, F>(
orig: RefMut<'b, T>,
f: F
) -> (RefMut<'b, U>, RefMut<'b, V>) where
F: FnOnce(&mut T) -> (&mut U, &mut V),
U: ?Sized,
V: ?Sized, [src]1.35.0
Splits a RefMut into multiple RefMuts for different components of the borrowed data.
The underlying RefCell will remain mutably borrowed until both returned RefMuts go out of scope.
The RefCell is already mutably borrowed, so this cannot fail.
This is an associated function that needs to be used as RefMut::map_split(...). A method would interfere with methods of the same name on the contents of a RefCell used through Deref.
use std::cell::{RefCell, RefMut};
let cell = RefCell::new([1, 2, 3, 4]);
let borrow = cell.borrow_mut();
let (mut begin, mut end) = RefMut::map_split(borrow, |slice| slice.split_at_mut(2));
assert_eq!(*begin, [1, 2]);
assert_eq!(*end, [3, 4]);
begin.copy_from_slice(&[4, 3]);
end.copy_from_slice(&[2, 1]);pub fn leak(orig: RefMut<'b, T>) -> &'b mut TⓘNotable traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output;
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized,
type Item = <I as Iterator>::Item;
impl<R: Read + ?Sized, '_> Read for &'_ mut R
impl<W: Write + ?Sized, '_> Write for &'_ mut W
[src]
Convert into a mutable reference to the underlying data.
The underlying RefCell can not be borrowed from again and will always appear already mutably borrowed, making the returned reference the only to the interior.
This is an associated function that needs to be used as RefMut::leak(...). A method would interfere with methods of the same name on the contents of a RefCell used through Deref.
#![feature(cell_leak)]
use std::cell::{RefCell, RefMut};
let cell = RefCell::new(0);
let value = RefMut::leak(cell.borrow_mut());
assert_eq!(*value, 0);
*value = 1;
assert!(cell.try_borrow_mut().is_err());impl<'b, T, U> CoerceUnsized<RefMut<'b, U>> for RefMut<'b, T> where
T: Unsize<U> + ?Sized,
U: ?Sized, [src]
impl<'_, T> Debug for RefMut<'_, T> where
T: Debug + ?Sized, [src]
impl<'_, T> Deref for RefMut<'_, T> where
T: ?Sized, [src]
type Target = TThe resulting type after dereferencing.
fn deref(&self) -> &TⓘNotable traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output;
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized,
type Item = <I as Iterator>::Item;
impl<R: Read + ?Sized, '_> Read for &'_ mut R
impl<W: Write + ?Sized, '_> Write for &'_ mut W
[src]
impl<'_, T> DerefMut for RefMut<'_, T> where
T: ?Sized, [src]
fn deref_mut(&mut self) -> &mut TⓘNotable traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output;
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized,
type Item = <I as Iterator>::Item;
impl<R: Read + ?Sized, '_> Read for &'_ mut R
impl<W: Write + ?Sized, '_> Write for &'_ mut W
[src]
impl<'_, T> Display for RefMut<'_, T> where
T: Display + ?Sized, [src]1.20.0
impl<'b, T> !RefUnwindSafe for RefMut<'b, T>impl<'b, T> !Send for RefMut<'b, T>impl<'b, T> !Sync for RefMut<'b, T>impl<'b, T: ?Sized> Unpin for RefMut<'b, T>impl<'b, T> !UnwindSafe for RefMut<'b, T>impl<T> Any for T where
T: 'static + ?Sized, [src]
impl<T> Borrow<T> for T where
T: ?Sized, [src]
fn borrow(&self) -> &TⓘNotable traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output;
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized,
type Item = <I as Iterator>::Item;
impl<R: Read + ?Sized, '_> Read for &'_ mut R
impl<W: Write + ?Sized, '_> Write for &'_ mut W
[src]
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]
fn borrow_mut(&mut self) -> &mut TⓘNotable traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output;
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized,
type Item = <I as Iterator>::Item;
impl<R: Read + ?Sized, '_> Read for &'_ mut R
impl<W: Write + ?Sized, '_> Write for &'_ mut W
[src]
impl<T> From<T> for T[src]
impl<T, U> Into<U> for T where
U: From<T>, [src]
impl<T> ToString for T where
T: Display + ?Sized, [src]
impl<T, U> TryFrom<U> for T where
U: Into<T>, [src]
type Error = InfallibleThe type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>, [src]
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/cell/struct.RefMut.html