ByOption

godot::meta

Enum ByOption 

pub enum ByOption<Via> {
    _Phantom(PhantomData<Via>),
}
Expand description

Pass optional arguments by returning Option<&T::Via>, allowing delegation to underlying type’s strategy.

This enables Option<T> to benefit from the underlying type’s efficient passing without cloning. ByRef doesn’t support this because it would transform Option<T> to &Option<T>; however, we need Option<&T> instead.

See ToGodot::Pass.

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_Phantom(PhantomData<Via>)

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impl<Via> ArgPassing for ByOption<Via>
where Via: GodotType, <Via as GodotType>::ToFfi<'f>: for<'f> GodotNullableFfi,

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type Output<'r, T: 'r> = Option<&'r Via> where ByOption<Via>: 'r

Return type: T or &'r T.

Auto Trait Implementations§

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impl<Via> Freeze for ByOption<Via>

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impl<Via> RefUnwindSafe for ByOption<Via>
where Via: RefUnwindSafe,

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impl<Via> Send for ByOption<Via>
where Via: Send,

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impl<Via> Sync for ByOption<Via>
where Via: Sync,

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impl<Via> Unpin for ByOption<Via>
where Via: Unpin,

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impl<Via> UnwindSafe for ByOption<Via>
where Via: UnwindSafe,

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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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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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, 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.