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QueryCtx

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Struct QueryCtx 

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pub struct QueryCtx<'a> {
    pub target: Option<&'a dyn Any>,
    pub chain: Option<&'a ChainFlags>,
    pub caps: &'a TypeMap,
}
Expand description

Read-only context for a Condition.

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§target: Option<&'a dyn Any>

Subject of the query.

§chain: Option<&'a ChainFlags>

Chain flags, or None outside a chain.

§caps: &'a TypeMap

Services available to the condition.

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impl QueryCtx<'_>

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pub fn target_as<T: Any>(&self) -> Option<&T>

Returns the query target as type T.

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pub fn service<T: Any>(&self) -> Option<&T>

Returns the host service of type T.

Auto Trait Implementations§

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impl<'a> !RefUnwindSafe for QueryCtx<'a>

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impl<'a> !Send for QueryCtx<'a>

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impl<'a> !Sync for QueryCtx<'a>

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impl<'a> !UnwindSafe for QueryCtx<'a>

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impl<'a> Freeze for QueryCtx<'a>

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impl<'a> Unpin for QueryCtx<'a>

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impl<'a> UnsafeUnpin for QueryCtx<'a>

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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 = !

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.