Struct ValueWriteAccess 

pub struct ValueWriteAccess<'a, T>
where
    T: 'a + ?Sized,
{ /* private fields */ }

Write guard over a value, obtained from a lifetime or one of its handles.

Derefs to the value mutably and releases the write claim on drop. While it is live no other access is allowed.

Implementations

impl<'a, T> ValueWriteAccess<'a, T>

where T: ?Sized,

pub unsafe fn new_raw( data: &'a mut T, lifetime: LifetimeState, ) -> ValueWriteAccess<'a, T>

Builds a guard from parts, without going through the state checks.

Safety

The write claim on lifetime must already be acquired, since dropping this guard releases one. data must be the value that lifetime guards, and must not be aliased.

impl<'a, T> ValueWriteAccess<'a, T>

where T: ?Sized,

pub fn remap<U>( self, f: impl FnOnce(&mut T) -> Option<&mut U>, ) -> Result<ValueWriteAccess<'a, U>, ValueWriteAccess<'a, T>>

Narrows the guard down to a part of the value, for example one field.

Gives the guard back unchanged when f returns None.

Trait Implementations

impl<T> Deref for ValueWriteAccess<'_, T>

where T: ?Sized,

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &<ValueWriteAccess<'_, T> as Deref>::Target

Dereferences the value.

impl<T> DerefMut for ValueWriteAccess<'_, T>

where T: ?Sized,

fn deref_mut(&mut self) -> &mut <ValueWriteAccess<'_, T> as Deref>::Target

Mutably dereferences the value.

impl<T> Drop for ValueWriteAccess<'_, T>

where T: ?Sized,

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

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

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.