rustc_data_structures::tagged_ptr

Struct TaggedPtr

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pub struct TaggedPtr<P, T, const COMPARE_PACKED: bool>
where
    P: Pointer,
    T: Tag,
{
    raw: CopyTaggedPtr<P, T, COMPARE_PACKED>,
}
Expand description

A tagged pointer that supports pointers that implement Drop.

This is essentially { pointer: P, tag: T } packed in a single pointer.

You should use CopyTaggedPtr instead of the this type in all cases where P implements Copy.

If COMPARE_PACKED is true, then the pointers will be compared and hashed without unpacking. Otherwise we don’t implement PartialEq, Eq and Hash; if you want that, wrap the TaggedPtr.

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§raw: CopyTaggedPtr<P, T, COMPARE_PACKED>

Implementations§

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impl<P, T, const CP: bool> TaggedPtr<P, T, CP>
where P: Pointer, T: Tag,

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pub fn new(pointer: P, tag: T) -> Self

Tags pointer with tag.

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pub fn tag(&self) -> T

Retrieves the tag.

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pub fn set_tag(&mut self, tag: T)

Sets the tag to a new value.

Trait Implementations§

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impl<P, T, const CP: bool> Clone for TaggedPtr<P, T, CP>
where P: Pointer + Clone, T: Tag,

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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<P, T, const CP: bool> Debug for TaggedPtr<P, T, CP>
where P: Pointer + Debug, T: Tag + Debug,

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

Formats the value using the given formatter. Read more
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impl<P, T, const CP: bool> Deref for TaggedPtr<P, T, CP>
where P: Pointer, T: Tag,

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type Target = <P as Deref>::Target

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl<P, T, const CP: bool> DerefMut for TaggedPtr<P, T, CP>
where P: Pointer + DerefMut, T: Tag,

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.
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impl<P, T, const CP: bool> Drop for TaggedPtr<P, T, CP>
where P: Pointer, T: Tag,

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl<P, T> Hash for TaggedPtr<P, T, true>
where P: Pointer, T: Tag,

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fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<P, T, HCX, const CP: bool> HashStable<HCX> for TaggedPtr<P, T, CP>
where P: Pointer + HashStable<HCX>, T: Tag + HashStable<HCX>,

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fn hash_stable(&self, hcx: &mut HCX, hasher: &mut StableHasher)

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impl<P, T> PartialEq for TaggedPtr<P, T, true>
where P: Pointer, T: Tag,

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fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<P, T> Eq for TaggedPtr<P, T, true>
where P: Pointer, T: Tag,

Auto Trait Implementations§

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impl<P, T, const COMPARE_PACKED: bool> Freeze for TaggedPtr<P, T, COMPARE_PACKED>

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impl<P, T, const COMPARE_PACKED: bool> RefUnwindSafe for TaggedPtr<P, T, COMPARE_PACKED>
where T: RefUnwindSafe, <P as Deref>::Target: RefUnwindSafe,

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impl<P, T, const COMPARE_PACKED: bool> Send for TaggedPtr<P, T, COMPARE_PACKED>
where P: Send, T: Send,

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impl<P, T, const COMPARE_PACKED: bool> Sync for TaggedPtr<P, T, COMPARE_PACKED>
where P: Sync, T: Sync,

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impl<P, T, const COMPARE_PACKED: bool> Unpin for TaggedPtr<P, T, COMPARE_PACKED>
where T: Unpin,

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impl<P, T, const COMPARE_PACKED: bool> UnwindSafe for TaggedPtr<P, T, COMPARE_PACKED>
where <P as Deref>::Target: RefUnwindSafe, T: UnwindSafe,

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = const ALIGN: Alignment = Alignment::of::<Self>();

Alignment of Self.
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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<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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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> 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
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

Layout§

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.