pub enum RustcEntry<'a, K, V, A = Global>where
    A: Allocator + Clone,{
    Occupied(RustcOccupiedEntry<'a, K, V, A>),
    Vacant(RustcVacantEntry<'a, K, V, A>),
}
Expand description

A view into a single entry in a map, which may either be vacant or occupied.

This enum is constructed from the rustc_entry method on HashMap.

Variants§

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Occupied(RustcOccupiedEntry<'a, K, V, A>)

An occupied entry.

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Vacant(RustcVacantEntry<'a, K, V, A>)

A vacant entry.

Implementations§

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impl<'a, K, V, A: Allocator + Clone> RustcEntry<'a, K, V, A>

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pub fn insert(self, value: V) -> RustcOccupiedEntry<'a, K, V, A>

Sets the value of the entry, and returns a RustcOccupiedEntry.

Examples
use hashbrown::HashMap;

let mut map: HashMap<&str, u32> = HashMap::new();
let entry = map.rustc_entry("horseyland").insert(37);

assert_eq!(entry.key(), &"horseyland");
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pub fn or_insert(self, default: V) -> &'a mut Vwhere K: Hash,

Ensures a value is in the entry by inserting the default if empty, and returns a mutable reference to the value in the entry.

Examples
use hashbrown::HashMap;

let mut map: HashMap<&str, u32> = HashMap::new();

map.rustc_entry("poneyland").or_insert(3);
assert_eq!(map["poneyland"], 3);

*map.rustc_entry("poneyland").or_insert(10) *= 2;
assert_eq!(map["poneyland"], 6);
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pub fn or_insert_with<F: FnOnce() -> V>(self, default: F) -> &'a mut Vwhere K: Hash,

Ensures a value is in the entry by inserting the result of the default function if empty, and returns a mutable reference to the value in the entry.

Examples
use hashbrown::HashMap;

let mut map: HashMap<&str, String> = HashMap::new();
let s = "hoho".to_string();

map.rustc_entry("poneyland").or_insert_with(|| s);

assert_eq!(map["poneyland"], "hoho".to_string());
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pub fn key(&self) -> &K

Returns a reference to this entry’s key.

Examples
use hashbrown::HashMap;

let mut map: HashMap<&str, u32> = HashMap::new();
assert_eq!(map.rustc_entry("poneyland").key(), &"poneyland");
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pub fn and_modify<F>(self, f: F) -> Selfwhere F: FnOnce(&mut V),

Provides in-place mutable access to an occupied entry before any potential inserts into the map.

Examples
use hashbrown::HashMap;

let mut map: HashMap<&str, u32> = HashMap::new();

map.rustc_entry("poneyland")
   .and_modify(|e| { *e += 1 })
   .or_insert(42);
assert_eq!(map["poneyland"], 42);

map.rustc_entry("poneyland")
   .and_modify(|e| { *e += 1 })
   .or_insert(42);
assert_eq!(map["poneyland"], 43);
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impl<'a, K, V: Default, A: Allocator + Clone> RustcEntry<'a, K, V, A>

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pub fn or_default(self) -> &'a mut Vwhere K: Hash,

Ensures a value is in the entry by inserting the default value if empty, and returns a mutable reference to the value in the entry.

Examples
use hashbrown::HashMap;

let mut map: HashMap<&str, Option<u32>> = HashMap::new();
map.rustc_entry("poneyland").or_default();

assert_eq!(map["poneyland"], None);

Trait Implementations§

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impl<K: Debug, V: Debug, A: Allocator + Clone> Debug for RustcEntry<'_, K, V, A>

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<'a, K, V, A> RefUnwindSafe for RustcEntry<'a, K, V, A>where A: RefUnwindSafe, K: RefUnwindSafe, V: RefUnwindSafe,

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impl<'a, K, V, A> Send for RustcEntry<'a, K, V, A>where A: Send, K: Send, V: Send,

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impl<'a, K, V, A> Sync for RustcEntry<'a, K, V, A>where A: Sync, K: Sync, V: Sync,

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impl<'a, K, V, A> Unpin for RustcEntry<'a, K, V, A>where K: Unpin,

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impl<'a, K, V, A = Global> !UnwindSafe for RustcEntry<'a, K, V, A>

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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 Twhere 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 Twhere 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 Twhere 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.