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SingletonRef

hydro_lang::singleton_ref

Struct SingletonRef 

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pub struct SingletonRef<'a, 'slf, T, L, const IS_MUT: bool = false> { /* private fields */ }
Expand description

A lightweight handle to a singleton that can be captured inside q!() closures.

Created via Singleton::by_ref(). When used inside a q!() closure, resolves to a reference to the singleton’s value (&T) at runtime.

This type is Copy (required by q!() macro internals). TODO(mingwei): https://github.com/hydro-project/stageleft/issues/73

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impl<'slf, T, L, const IS_MUT: bool> SingletonRef<'_, 'slf, T, L, IS_MUT>

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pub fn as_ref(&self) -> SingletonRef<'_, 'slf, T, L, false>

Converts this singleton into a shared (non-mut) SingletonRef.

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pub fn as_mut(&self) -> SingletonRef<'_, 'slf, T, L, true>

Converts this singleton into an exclusive (mut) SingletonRef.

Trait Implementations§

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impl<T, L, const IS_MUT: bool> Clone for SingletonRef<'_, '_, T, L, IS_MUT>

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fn clone(&self) -> Self

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, L, const IS_MUT: bool> Copy for SingletonRef<'_, '_, T, L, IS_MUT>

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impl<'a, 'slf, T: 'a, L> FreeVariableWithContextWithProps<L, ()> for SingletonRef<'a, 'slf, T, L>
where L: Location<'a>,

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type O = &'a T

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fn to_tokens(self, ctx: &L) -> (QuoteTokens, ())

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fn uninitialized(&self, _ctx: &Ctx) -> fn() -> Self::O

Auto Trait Implementations§

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impl<'a, 'slf, T, L, const IS_MUT: bool = false> !RefUnwindSafe for SingletonRef<'a, 'slf, T, L, IS_MUT>

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impl<'a, 'slf, T, L, const IS_MUT: bool = false> !Send for SingletonRef<'a, 'slf, T, L, IS_MUT>

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impl<'a, 'slf, T, L, const IS_MUT: bool = false> !Sync for SingletonRef<'a, 'slf, T, L, IS_MUT>

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impl<'a, 'slf, T, L, const IS_MUT: bool = false> !UnwindSafe for SingletonRef<'a, 'slf, T, L, IS_MUT>

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impl<'a, 'slf, T, L, const IS_MUT: bool> Freeze for SingletonRef<'a, 'slf, T, L, IS_MUT>

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impl<'a, 'slf, T, L, const IS_MUT: bool> Unpin for SingletonRef<'a, 'slf, T, L, IS_MUT>
where L: Unpin,

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impl<'a, 'slf, T, L, const IS_MUT: bool> UnsafeUnpin for SingletonRef<'a, 'slf, T, L, IS_MUT>

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> AsOut<T> for T
where T: Copy,

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fn as_out(&mut self) -> Out<'_, T>

Returns an out reference to self.
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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, 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<Ctx, T> FreeVariableWithContext<Ctx> for T
where T: FreeVariableWithContextWithProps<Ctx, ()>,

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fn to_tokens(self, ctx: &Ctx) -> QuoteTokens
where Self: Sized,

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fn uninitialized(&self, ctx: &Ctx) -> fn() -> Self::O

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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<Unshared, Shared> IntoShared<Shared> for Unshared
where Shared: FromUnshared<Unshared>,

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fn into_shared(self) -> Shared

Creates a shared type from an unshared type.
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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> ToSinkBuild for T

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fn iter_to_sink_build(self) -> SendIterBuild<Self>
where Self: Sized + Iterator,

Starts a SinkBuild adaptor chain to send all items from self as an Iterator.
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fn stream_to_sink_build(self) -> SendStreamBuild<Self>
where Self: Sized + Stream,

Starts a SinkBuild adaptor chain to send all items from self as a [Stream].
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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<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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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