Struct wasmer_types::lib::std::sync::MappedRwLockWriteGuard

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

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

Available on crate feature std only.

Expand description

RAII structure used to release the exclusive write access of a lock when dropped, which can point to a subfield of the protected data.

This structure is created by the map and try_map methods on RwLockWriteGuard.

Implementations§

impl<'a, T> MappedRwLockWriteGuard<'a, T>
where T: ?Sized,

pub fn map<U, F>( orig: MappedRwLockWriteGuard<'a, T>, f: F, ) -> MappedRwLockWriteGuard<'a, U>
where F: FnOnce(&mut T) -> &mut U, U: ?Sized,

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

Makes a MappedRwLockWriteGuard for a component of the borrowed data, e.g. an enum variant.

The RwLock is already locked for writing, so this cannot fail.

This is an associated function that needs to be used as MappedRwLockWriteGuard::map(...). A method would interfere with methods of the same name on the contents of the MappedRwLockWriteGuard used through Deref.

§Panics

If the closure panics, the guard will be dropped (unlocked) and the RwLock will be poisoned.

pub fn try_map<U, F>( orig: MappedRwLockWriteGuard<'a, T>, f: F, ) -> Result<MappedRwLockWriteGuard<'a, U>, MappedRwLockWriteGuard<'a, T>>
where F: FnOnce(&mut T) -> Option<&mut U>, U: ?Sized,

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

Makes a MappedRwLockWriteGuard for a component of the borrowed data. The original guard is returned as an Err(...) if the closure returns None.

The RwLock is already locked for writing, so this cannot fail.

This is an associated function that needs to be used as MappedRwLockWriteGuard::try_map(...). A method would interfere with methods of the same name on the contents of the MappedRwLockWriteGuard used through Deref.

§Panics

If the closure panics, the guard will be dropped (unlocked) and the RwLock will be poisoned.

Trait Implementations§

impl<T> Debug for MappedRwLockWriteGuard<'_, T>
where T: Debug + ?Sized,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more

impl<T> Deref for MappedRwLockWriteGuard<'_, T>
where T: ?Sized,

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for MappedRwLockWriteGuard<'_, T>
where T: ?Sized,

fn deref_mut(&mut self) -> &mut T

Mutably dereferences the value.

impl<T> Display for MappedRwLockWriteGuard<'_, T>
where T: Display + ?Sized,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more

impl<T> Drop for MappedRwLockWriteGuard<'_, T>
where T: ?Sized,

fn drop(&mut self)

Executes the destructor for this type. Read more

impl<T> !Send for MappedRwLockWriteGuard<'_, T>
where T: ?Sized,

impl<T> Sync for MappedRwLockWriteGuard<'_, T>
where T: Sync + ?Sized,

Auto Trait Implementations§

impl<'a, T> Freeze for MappedRwLockWriteGuard<'a, T>
where T: ?Sized,

impl<'a, T> RefUnwindSafe for MappedRwLockWriteGuard<'a, T>
where T: RefUnwindSafe + ?Sized,

impl<'a, T> Unpin for MappedRwLockWriteGuard<'a, T>
where T: ?Sized,

impl<'a, T> !UnwindSafe for MappedRwLockWriteGuard<'a, T>

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> ArchivePointee for T

type ArchivedMetadata = ()

The archived version of the pointer metadata for this type.

fn pointer_metadata( _: &<T as ArchivePointee>::ArchivedMetadata, ) -> <T as Pointee>::Metadata

Converts some archived metadata to the pointer metadata for itself.

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

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

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

Mutably borrows from an owned value. Read more

impl<F, W, T, D> Deserialize<With<T, W>, D> for F
where W: DeserializeWith<F, T, D>, D: Fallible + ?Sized, F: ?Sized,

fn deserialize( &self, deserializer: &mut D, ) -> Result<With<T, W>, <D as Fallible>::Error>

Deserializes using the given deserializer

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T> LayoutRaw for T

fn layout_raw(_: <T as Pointee>::Metadata) -> Result<Layout, LayoutError>

Gets the layout of the type.

impl<T> Pointee for T

type Metadata = ()

The type for metadata in pointers and references to Self.

impl<T> Same for T

type Output = T

Should always be Self

impl<T> ToString for T
where T: Display + ?Sized,

default fn to_string(&self) -> String

Converts the given value to a String. Read more

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.