Struct zng_var::types::AnyWhenVarBuilder

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pub struct AnyWhenVarBuilder { /* private fields */ }
Expand description

Manually build a ArcWhenVar<T> from type erased parts.

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impl AnyWhenVarBuilder

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pub fn new<O: VarValue>(default: impl IntoVar<O>) -> Self

Start building with only the default value.

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pub fn new_any(default: BoxedAnyVar) -> AnyWhenVarBuilder

Start building with already boxed var.

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pub fn from_var<O: VarValue>(var: &ContextualizedVar<O>) -> Self

Create a builder from the parts of a formed when_var!.

§Panics

Panics if called not called with a contextualized var produced by when_var!.

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pub fn condition_count(&self) -> usize

Returns the number of conditions set.

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pub fn set_default<O: VarValue>(&mut self, default: impl IntoVar<O>)

Set/replace the default value.

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pub fn set_default_any(&mut self, default: BoxedAnyVar)

Set/replace the default value with an already typed erased var.

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pub fn push<C, O, V>(&mut self, condition: C, value: V)
where C: Var<bool>, O: VarValue, V: IntoVar<O>,

Push a when condition.

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pub fn push_any(&mut self, condition: BoxedVar<bool>, value: BoxedAnyVar)

Push a when condition already boxed and type erased.

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pub fn replace_extend(&mut self, other: &Self)

Replace the default value if other has default and extend the conditions with clones of other.

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pub fn extend(&mut self, other: &Self)

Extend the conditions with clones of other.

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pub fn build<T: VarValue>(&self) -> Option<BoxedVar<T>>

Build the when var if all value variables are of type BoxedVar<T>.

Trait Implementations§

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impl Clone for AnyWhenVarBuilder

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for AnyWhenVarBuilder

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> IntoEither for T

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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 more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

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
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more