UnordBag in rustc_data_structures::unord - Rust
Description: This is a collection type that tries very hard to not expose any internal iteration. This is a useful property when trying to uphold the determinism invariants imposed by the query system.

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## UnordBag

# Struct UnordBag

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    pub struct UnordBag<V> {
        inner: Vec<V>,
    }

Expand description

This is a collection type that tries very hard to not expose any internal iteration. This is a useful property when trying to uphold the determinism invariants imposed by the query system.

This collection type is a good choice for collections the keys of which don’t have a semantic ordering and don’t implement `Hash` or `Eq`.

See MCP 533 for more information.

## Fields§

§`inner: Vec<V>`

## Implementations§

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### impl<V> UnordBag<V>

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#### pub fn new() -> Self

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#### pub fn len(&self) -> usize

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#### pub fn push(&mut self, v: V)

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#### pub fn items(&self) -> UnordItems<&V, impl Iterator<Item = &V>>

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#### pub fn into_items(self) -> UnordItems<V, impl Iterator<Item = V>>

## Trait Implementations§

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### impl<V: Clone> Clone for UnordBag<V>

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#### fn clone(&self) -> UnordBag<V>

Returns a duplicate 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<V: Debug> Debug for UnordBag<V>

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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<V, __D: Decoder> Decodable<__D> for UnordBag<V>
where Vec<V>: Decodable<__D>,

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#### fn decode(__decoder: &mut __D) -> Self

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### impl<V: Default> Default for UnordBag<V>

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#### fn default() -> UnordBag<V>

Returns the “default value” for a type. Read more
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### impl<V, __E: Encoder> Encodable<__E> for UnordBag<V>
where Vec<V>: Encodable<__E>,

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#### fn encode(&self, __encoder: &mut __E)

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### impl<T> Extend<T> for UnordBag<T>

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#### fn extend<I: IntoIterator<Item = T>>(&mut self, iter: I)

Extends a collection with the contents of an iterator. Read more
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#### fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (`extend_one`)
Extends a collection with exactly one element.
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#### fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (`extend_one`)
Reserves capacity in a collection for the given number of additional elements. Read more
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### impl<T, I: Iterator<Item = T>> From<UnordItems<T, I>> for UnordBag<T>

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#### fn from(value: UnordItems<T, I>) -> Self

Converts to this type from the input type.
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### impl<V: PartialEq> PartialEq for UnordBag<V>

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#### fn eq(&self, other: &UnordBag<V>) -> 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<V: Hash + Eq + StableHash> StableHash for UnordBag<V>

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#### fn stable_hash<Hcx: StableHashCtxt>( &self, hcx: &mut Hcx, hasher: &mut StableHasher, )

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### impl<V: Eq> Eq for UnordBag<V>

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### impl<T> !IntoIterator for UnordBag<T>

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### impl<V> StructuralPartialEq for UnordBag<V>

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### impl<T> UnordCollection for UnordBag<T>

## Auto Trait Implementations§

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### impl<V> DynSend for UnordBag<V>
where V: DynSend,

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### impl<V> DynSync for UnordBag<V>
where V: DynSync,

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### impl<V> Freeze for UnordBag<V>

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### impl<V> RefUnwindSafe for UnordBag<V>
where V: RefUnwindSafe,

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### impl<V> Send for UnordBag<V>
where V: Send,

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### impl<V> Sync for UnordBag<V>
where V: Sync,

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### impl<V> Unpin for UnordBag<V>
where V: Unpin,

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### impl<V> UnsafeUnpin for UnordBag<V>

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### impl<V> UnwindSafe for UnordBag<V>
where V: 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, 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<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<C, T> ExtendUnord<T> for C
where C: Extend<T> + UnordCollection,

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#### fn extend_unord<I>(&mut self, items: UnordItems<T, I>)
where I: Iterator<Item = T>,

Extend this unord collection with the given `UnordItems`. This method is called `extend_unord` instead of just `extend` so it does not conflict with `Extend::extend`. Otherwise there would be many places where the two methods would have to be explicitly disambiguated via UFCS.
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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> Pointable for T

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#### const ALIGN: usize

The alignment of pointer.
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#### type Init = T

The type for initializers.
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#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. 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

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes