Enum abi_stable::std_types::map::REntry [−][src]
#[repr(C)]
pub enum REntry<'a, K, V> {
Occupied(ROccupiedEntry<'a, K, V>),
Vacant(RVacantEntry<'a, K, V>),
}
Expand description
A handle into an entry in a map, which is either vacant or occupied.
Variants
Occupied(ROccupiedEntry<'a, K, V>)
Tuple Fields of Occupied
0: ROccupiedEntry<'a, K, V>
Vacant(RVacantEntry<'a, K, V>)
Tuple Fields of Vacant
0: RVacantEntry<'a, K, V>
Implementations
Returns a reference to the value in the entry.
Example
use abi_stable::std_types::RHashMap;
let mut map: RHashMap<u32, u32> = vec![(1, 100)].into_iter().collect();
assert_eq!(map.entry(0).get(), None);
assert_eq!(map.entry(1).get(), Some(&100));
Returns a mutable reference to the value in the entry.
Example
use abi_stable::std_types::RHashMap;
let mut map: RHashMap<u32, u32> = vec![(1, 100)].into_iter().collect();
assert_eq!(map.entry(0).get_mut(), None);
assert_eq!(map.entry(1).get_mut(), Some(&mut 100));
Inserts default
as the value in the entry if it wasn’t occupied,
returning a mutable reference to the value in the entry.
Example
use abi_stable::std_types::RHashMap;
let mut map = RHashMap::<u32, u32>::new();
assert_eq!(map.entry(0).or_insert(100), &mut 100);
assert_eq!(map.entry(0).or_insert(400), &mut 100);
Inserts default()
as the value in the entry if it wasn’t occupied,
returning a mutable reference to the value in the entry.
Example
use abi_stable::std_types::{RHashMap, RString};
let mut map = RHashMap::<u32, RString>::new();
assert_eq!(
map.entry(0).or_insert_with(|| "foo".into()),
&mut RString::from("foo")
);
assert_eq!(
map.entry(0).or_insert_with(|| "bar".into()),
&mut RString::from("foo")
);
Gets the key of the entry.
Example
use abi_stable::std_types::{RHashMap, RString};
let mut map = RHashMap::<RString, RString>::new();
map.insert("foo".into(), "bar".into());
assert_eq!(map.entry("foo".into()).key(), &RString::from("foo"));
Allows mutating an occupied entry before doing other operations.
This is a no-op on a vacant entry.
Example
use abi_stable::std_types::{RHashMap, RString};
let mut map = RHashMap::<RString, RString>::new();
map.insert("foo".into(), "bar".into());
assert_eq!(
map.entry("foo".into())
.and_modify(|x| x.push_str("hoo"))
.get(),
Some(&RString::from("barhoo"))
);
Inserts the V::default()
value in the entry if it wasn’t occupied,
returning a mutable reference to the value in the entry.
Example
use abi_stable::std_types::RHashMap;
let mut map = RHashMap::<u32, u32>::new();
assert_eq!(map.entry(0).or_insert(100), &mut 100);
assert_eq!(map.entry(0).or_default(), &mut 100);
assert_eq!(map.entry(1).or_default(), &mut 0);
Trait Implementations
impl<'a, K, V> GetStaticEquivalent_ for REntry<'a, K, V> where
K: __StableAbi,
V: __StableAbi,
K: 'a,
V: 'a,
impl<'a, K, V> GetStaticEquivalent_ for REntry<'a, K, V> where
K: __StableAbi,
V: __StableAbi,
K: 'a,
V: 'a,
type StaticEquivalent = _static_REntry<'static, __GetStaticEquivalent<K>, __GetStaticEquivalent<V>>
impl<'a, K, V> StableAbi for REntry<'a, K, V> where
K: __StableAbi,
V: __StableAbi,
K: 'a,
V: 'a,
impl<'a, K, V> StableAbi for REntry<'a, K, V> where
K: __StableAbi,
V: __StableAbi,
K: 'a,
V: 'a,
type IsNonZeroType = False
type IsNonZeroType = False
Whether this type has a single invalid bit-pattern. Read more
The layout of the type provided by implementors.
const
-equivalents of the associated types.
Auto Trait Implementations
impl<'a, K, V> RefUnwindSafe for REntry<'a, K, V> where
K: RefUnwindSafe,
V: RefUnwindSafe,
impl<'a, K, V> !UnwindSafe for REntry<'a, K, V>
Blanket Implementations
Mutably borrows from an owned value. Read more
type ForSelf = WithMetadata_<T, T>
type ForSelf = WithMetadata_<T, T>
This is always WithMetadata_<Self, Self>
Compares the address of self
with the address of other
. Read more
Emulates the pipeline operator, allowing method syntax in more places. Read more
The same as piped
except that the function takes &Self
Useful for functions that take &Self
instead of Self
. Read more
The same as piped
, except that the function takes &mut Self
.
Useful for functions that take &mut Self
instead of Self
. Read more
Mutates self using a closure taking self by mutable reference, passing it along the method chain. Read more
Observes the value of self, passing it along unmodified. Useful in long method chains. Read more
Performs a conversion with Into
.
using the turbofish .into_::<_>()
syntax. Read more
Performs a reference to reference conversion with AsRef
,
using the turbofish .as_ref_::<_>()
syntax. Read more
Performs a mutable reference to mutable reference conversion with AsMut
,
using the turbofish .as_mut_::<_>()
syntax. Read more
unsafe fn transmute_element<T>(
self
) -> <Self as CanTransmuteElement<T>>::TransmutedPtr where
Self: CanTransmuteElement<T>,
unsafe fn transmute_element<T>(
self
) -> <Self as CanTransmuteElement<T>>::TransmutedPtr where
Self: CanTransmuteElement<T>,
Transmutes the element type of this pointer.. Read more
type Type = T
type Type = T
This is always Self
.
Converts a value back to the original type.
Converts a mutable reference back to the original type.
alloc
only.Converts a box back to the original type.
Converts a value back to the original type.
Converts a reference back to the original type.
Converts a mutable reference back to the original type.
alloc
only.Converts a box back to the original type.
alloc
only.Converts an Arc back to the original type.
alloc
only.Converts an Rc back to the original type.