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Undefined

ferrijs_std::utils::option

Struct Undefined 

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pub struct Undefined<T>(pub Option<T>);
Expand description

Helper type for treating an undefined value as None, without treating null as None

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§0: Option<T>

Trait Implementations§

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impl<T: Clone> Clone for Undefined<T>

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fn clone(&self) -> Undefined<T>

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T> Default for Undefined<T>

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<'js, T: FromJs<'js>> FromJs<'js> for Undefined<T>

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fn from_js(ctx: &Ctx<'js>, value: Value<'js>) -> Result<Self>

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impl<'js, T: IntoJs<'js>> IntoJs<'js> for Undefined<T>

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fn into_js(self, ctx: &Ctx<'js>) -> Result<Value<'js>>

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impl<'js, T: JsLifetime<'js>> JsLifetime<'js> for Undefined<T>

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type Changed<'to> = Undefined<<T as JsLifetime<'js>>::Changed<'to>>

The target which has the same type as a Self but with another lifetime 't
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impl<'js, T: Trace<'js>> Trace<'js> for Undefined<T>

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fn trace<'a>(&self, tracer: Tracer<'a, 'js>)

Auto Trait Implementations§

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impl<T> Freeze for Undefined<T>
where Option<T>: Freeze,

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impl<T> RefUnwindSafe for Undefined<T>
where Option<T>: RefUnwindSafe,

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impl<T> Send for Undefined<T>
where Option<T>: Send,

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impl<T> Sync for Undefined<T>
where Option<T>: Sync,

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impl<T> Unpin for Undefined<T>
where Option<T>: Unpin,

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impl<T> UnsafeUnpin for Undefined<T>
where Option<T>: UnsafeUnpin,

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impl<T> UnwindSafe for Undefined<T>
where Option<T>: UnwindSafe,

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<'js, T> AsProperty<'js, T> for T
where T: IntoJs<'js>,

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fn config( self, ctx: &Ctx<'js>, ) -> Result<(i32, Value<'js>, Value<'js>, Value<'js>), Error>

Property configuration 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<ST, DT> CastableFrom<ST, Initialized, Initialized> for DT
where ST: ?Sized, DT: ?Sized,

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impl<ST, DT> CastableFrom<ST, Uninit, Uninit> for DT
where ST: ?Sized, DT: ?Sized,

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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. 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<'js, T> FromParam<'js> for T
where T: FromJs<'js>,

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fn param_requirement() -> ParamRequirement

The parameters requirements this value requires.
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fn from_param<'a>(params: &mut ParamsAccessor<'a, 'js>) -> Result<T, Error>

Convert from a parameter value.
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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<'js, T> IntoArg<'js> for T
where T: IntoJs<'js>,

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fn num_args(&self) -> usize

The number of arguments this value produces.
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fn into_arg(self, args: &mut Args<'js>) -> Result<(), Error>

Convert the value into an argument.
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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> ParallelSend for T
where T: Send,

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impl<T> Read<Exclusive, BecauseExclusive> for T
where T: ?Sized,

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impl<T> Same for T

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type Output = T

Should always be Self
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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 = !

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

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