pub enum Entry<'a, T, S> {
Occupied(OccupiedEntry<'a, T, S>),
Vacant(VacantEntry<'a, T, S>),
}
🔬This is a nightly-only experimental API. (
hash_set_entry
#60896)Expand description
A view into a single entry in a set, which may either be vacant or occupied.
This enum
is constructed from the entry
method on HashSet
.
§Examples
#![feature(hash_set_entry)]
use std::collections::hash_set::HashSet;
let mut set = HashSet::new();
set.extend(["a", "b", "c"]);
assert_eq!(set.len(), 3);
// Existing value (insert)
let entry = set.entry("a");
let _raw_o = entry.insert();
assert_eq!(set.len(), 3);
// Nonexistent value (insert)
set.entry("d").insert();
// Existing value (or_insert)
set.entry("b").or_insert();
// Nonexistent value (or_insert)
set.entry("e").or_insert();
println!("Our HashSet: {:?}", set);
let mut vec: Vec<_> = set.iter().copied().collect();
// The `Iter` iterator produces items in arbitrary order, so the
// items must be sorted to test them against a sorted array.
vec.sort_unstable();
assert_eq!(vec, ["a", "b", "c", "d", "e"]);
Variants§
Occupied(OccupiedEntry<'a, T, S>)
🔬This is a nightly-only experimental API. (
hash_set_entry
#60896)An occupied entry.
§Examples
Vacant(VacantEntry<'a, T, S>)
🔬This is a nightly-only experimental API. (
hash_set_entry
#60896)A vacant entry.
§Examples
Implementations§
Source§impl<'a, T, S> Entry<'a, T, S>
impl<'a, T, S> Entry<'a, T, S>
Sourcepub fn insert(self) -> OccupiedEntry<'a, T, S>where
T: Hash,
S: BuildHasher,
🔬This is a nightly-only experimental API. (hash_set_entry
#60896)
pub fn insert(self) -> OccupiedEntry<'a, T, S>where
T: Hash,
S: BuildHasher,
hash_set_entry
#60896)Sets the value of the entry, and returns an OccupiedEntry.
§Examples
Sourcepub fn or_insert(self)where
T: Hash,
S: BuildHasher,
🔬This is a nightly-only experimental API. (hash_set_entry
#60896)
pub fn or_insert(self)where
T: Hash,
S: BuildHasher,
hash_set_entry
#60896)Ensures a value is in the entry by inserting if it was vacant.
§Examples
Trait Implementations§
Auto Trait Implementations§
impl<'a, T, S> Freeze for Entry<'a, T, S>where
T: Freeze,
impl<'a, T, S> RefUnwindSafe for Entry<'a, T, S>where
T: RefUnwindSafe,
S: RefUnwindSafe,
impl<'a, T, S> Send for Entry<'a, T, S>
impl<'a, T, S> Sync for Entry<'a, T, S>
impl<'a, T, S> Unpin for Entry<'a, T, S>where
T: Unpin,
impl<'a, T, S> !UnwindSafe for Entry<'a, T, S>
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more