Struct bevy::utils::hashbrown::hash_set::OccupiedEntry

pub struct OccupiedEntry<'a, T, S, A = Global>
where A: Allocator,
{ /* private fields */ }
Expand description

A view into an occupied entry in a HashSet. It is part of the Entry enum.

§Examples

use hashbrown::hash_set::{Entry, HashSet, OccupiedEntry};

let mut set = HashSet::new();
set.extend(["a", "b", "c"]);

let _entry_o: OccupiedEntry<_, _> = set.entry("a").insert();
assert_eq!(set.len(), 3);

// Existing key
match set.entry("a") {
    Entry::Vacant(_) => unreachable!(),
    Entry::Occupied(view) => {
        assert_eq!(view.get(), &"a");
    }
}

assert_eq!(set.len(), 3);

// Existing key (take)
match set.entry("c") {
    Entry::Vacant(_) => unreachable!(),
    Entry::Occupied(view) => {
        assert_eq!(view.remove(), "c");
    }
}
assert_eq!(set.get(&"c"), None);
assert_eq!(set.len(), 2);

Implementations§

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impl<T, S, A> OccupiedEntry<'_, T, S, A>
where A: Allocator,

pub fn get(&self) -> &T

Gets a reference to the value in the entry.

§Examples
use hashbrown::hash_set::{Entry, HashSet};

let mut set: HashSet<&str> = HashSet::new();
set.entry("poneyland").or_insert();

match set.entry("poneyland") {
    Entry::Vacant(_) => panic!(),
    Entry::Occupied(entry) => assert_eq!(entry.get(), &"poneyland"),
}

pub fn remove(self) -> T

Takes the value out of the entry, and returns it. Keeps the allocated memory for reuse.

§Examples
use hashbrown::HashSet;
use hashbrown::hash_set::Entry;

let mut set: HashSet<&str> = HashSet::new();
// The set is empty
assert!(set.is_empty() && set.capacity() == 0);

set.entry("poneyland").or_insert();
let capacity_before_remove = set.capacity();

if let Entry::Occupied(o) = set.entry("poneyland") {
    assert_eq!(o.remove(), "poneyland");
}

assert_eq!(set.contains("poneyland"), false);
// Now set hold none elements but capacity is equal to the old one
assert!(set.len() == 0 && set.capacity() == capacity_before_remove);

pub fn replace(self) -> T

Replaces the entry, returning the old value. The new value in the hash map will be the value used to create this entry.

§Panics

Will panic if this OccupiedEntry was created through Entry::insert.

§Examples
 use hashbrown::hash_set::{Entry, HashSet};
 use std::rc::Rc;

 let mut set: HashSet<Rc<String>> = HashSet::new();
 let key_one = Rc::new("Stringthing".to_string());
 let key_two = Rc::new("Stringthing".to_string());

 set.insert(key_one.clone());
 assert!(Rc::strong_count(&key_one) == 2 && Rc::strong_count(&key_two) == 1);

 match set.entry(key_two.clone()) {
     Entry::Occupied(entry) => {
         let old_key: Rc<String> = entry.replace();
         assert!(Rc::ptr_eq(&key_one, &old_key));
     }
     Entry::Vacant(_) => panic!(),
 }

 assert!(Rc::strong_count(&key_one) == 1 && Rc::strong_count(&key_two) == 2);
 assert!(set.contains(&"Stringthing".to_owned()));

Trait Implementations§

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impl<T, S, A> Debug for OccupiedEntry<'_, T, S, A>
where T: Debug, A: Allocator,

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<'a, T, S, A> Freeze for OccupiedEntry<'a, T, S, A>
where T: Freeze,

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impl<'a, T, S, A> RefUnwindSafe for OccupiedEntry<'a, T, S, A>

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impl<'a, T, S, A> Send for OccupiedEntry<'a, T, S, A>
where T: Send, S: Send, A: Send,

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impl<'a, T, S, A> Sync for OccupiedEntry<'a, T, S, A>
where T: Sync, S: Sync, A: Sync,

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impl<'a, T, S, A> Unpin for OccupiedEntry<'a, T, S, A>
where T: Unpin,

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impl<'a, T, S, A = Global> !UnwindSafe for OccupiedEntry<'a, T, S, 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, U> AsBindGroupShaderType<U> for T
where U: ShaderType, &'a T: for<'a> Into<U>,

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fn as_bind_group_shader_type(&self, _images: &RenderAssets<GpuImage>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
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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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fn downcast(&self) -> &T

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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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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<S> FromSample<S> for S

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fn from_sample_(s: S) -> S

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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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Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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where U: From<T>,

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Calls U::from(self).

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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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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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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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Dereferences the given pointer. Read more
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Mutably dereferences the given pointer. Read more
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