1.0.0[][src]Struct rustc_data_structures::sync::WriteGuard

pub struct WriteGuard<'b, T> where
    T: 'b + 'b + ?Sized
{ value: &'b mut T, borrow: BorrowRefMut<'b>, }

A wrapper type for a mutably borrowed value from a RefCell<T>.

See the module-level documentation for more.

Fields

Methods

impl<'b, T> RefMut<'b, T> where
    T: ?Sized
[src]

Make 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.

Examples

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'));

🔬 This is a nightly-only experimental API. (refcell_map_split)

Split 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.

Examples

#![feature(refcell_map_split)]
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]);

Trait Implementations

impl<'b, T> Debug for RefMut<'b, T> where
    T: Debug + ?Sized
[src]

Formats the value using the given formatter. Read more

impl<'b, T, U> CoerceUnsized<RefMut<'b, U>> for RefMut<'b, T> where
    T: Unsize<U> + ?Sized,
    U: ?Sized
[src]

impl<'b, T> DerefMut for RefMut<'b, T> where
    T: ?Sized
[src]

Important traits for &'a mut R

Mutably dereferences the value.

impl<'b, T> Deref for RefMut<'b, T> where
    T: ?Sized
[src]

The resulting type after dereferencing.

Important traits for &'a mut R

Dereferences the value.

impl<'a, T> Display for RefMut<'a, T> where
    T: Display + ?Sized
1.20.0
[src]

Formats the value using the given formatter. Read more

impl<'a, T> StableDeref for RefMut<'a, T> where
    T: ?Sized

Auto Trait Implementations

impl<'b, T> !Send for RefMut<'b, T>

impl<'b, T> !Sync for RefMut<'b, T>

Blanket Implementations

impl<T> Erased for T
[src]

impl<T> Send for T where
    T: ?Sized
[src]

impl<T> Sync for T where
    T: ?Sized
[src]

impl<T> From for T
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Performs the conversion.

impl<T> ToString for T where
    T: Display + ?Sized
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Converts the given value to a String. Read more

impl<T, U> Into for T where
    U: From<T>, 
[src]

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
[src]

🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<E> SpecializationError for E
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T