Struct zng_var::ContextInitHandle
source · pub struct ContextInitHandle(/* private fields */);
Expand description
Identifies the unique context a ContextualizedVar
is in.
Each node that sets context-vars have an unique ID, it is different after each (re)init. The ContextualizedVar
records this ID, and rebuilds when it has changed. The contextualized inner vars are retained when the ID has at least one
clone.
Implementations§
source§impl ContextInitHandle
impl ContextInitHandle
sourcepub fn with_context<R>(&self, action: impl FnOnce() -> R) -> R
pub fn with_context<R>(&self, action: impl FnOnce() -> R) -> R
Runs action
with self
as the current context ID.
Note that ContextVar::with_context
already calls this method.
sourcepub fn downgrade(&self) -> WeakContextInitHandle
pub fn downgrade(&self) -> WeakContextInitHandle
Create a weak handle that can be used to monitor self
, but does not hold it.
Trait Implementations§
source§impl Clone for ContextInitHandle
impl Clone for ContextInitHandle
source§fn clone(&self) -> ContextInitHandle
fn clone(&self) -> ContextInitHandle
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl Debug for ContextInitHandle
impl Debug for ContextInitHandle
source§impl Default for ContextInitHandle
impl Default for ContextInitHandle
source§fn default() -> ContextInitHandle
fn default() -> ContextInitHandle
Returns the “default value” for a type. Read more
source§impl Hash for ContextInitHandle
impl Hash for ContextInitHandle
source§impl PartialEq for ContextInitHandle
impl PartialEq for ContextInitHandle
impl Eq for ContextInitHandle
Auto Trait Implementations§
impl Freeze for ContextInitHandle
impl RefUnwindSafe for ContextInitHandle
impl Send for ContextInitHandle
impl Sync for ContextInitHandle
impl Unpin for ContextInitHandle
impl UnwindSafe for ContextInitHandle
Blanket Implementations§
source§impl<T> AnyVarValue for Twhere
T: VarValue,
impl<T> AnyVarValue for Twhere
T: VarValue,
source§fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Access to mut
dyn Any
methods.source§fn clone_boxed(&self) -> Box<dyn AnyVarValue>
fn clone_boxed(&self) -> Box<dyn AnyVarValue>
Clone the value.
source§fn clone_boxed_var(&self) -> Box<dyn AnyVar>
fn clone_boxed_var(&self) -> Box<dyn AnyVar>
Clone the value into a new boxed
LocalVar<Self>
.source§fn eq_any(&self, other: &(dyn AnyVarValue + 'static)) -> bool
fn eq_any(&self, other: &(dyn AnyVarValue + 'static)) -> bool
Gets if
self
equals other
.source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
🔬This is a nightly-only experimental API. (
clone_to_uninit
)§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
Compare self to
key
and return true
if they are equal.§impl<T> Instrument for T
impl<T> Instrument for T
§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
Converts
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
Converts
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more