cast::revm::interpreter::primitives::alloy_primitives::map::hash_map

Enum Entry

1.0.0 · Source
pub enum Entry<'a, K, V>
where K: 'a, V: 'a,
{ Occupied(OccupiedEntry<'a, K, V>), Vacant(VacantEntry<'a, K, V>), }
Available on crate feature map only.
Expand description

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

This enum is constructed from the entry method on HashMap.

Variants§

§1.0.0

Occupied(OccupiedEntry<'a, K, V>)

An occupied entry.

§1.0.0

Vacant(VacantEntry<'a, K, V>)

A vacant entry.

Implementations§

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impl<'a, K, V> Entry<'a, K, V>

1.0.0 · Source

pub fn or_insert(self, default: V) -> &'a mut V

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 std::collections::HashMap;

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

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

*map.entry("poneyland").or_insert(10) *= 2;
assert_eq!(map["poneyland"], 6);
1.0.0 · Source

pub fn or_insert_with<F>(self, default: F) -> &'a mut V
where F: FnOnce() -> V,

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 std::collections::HashMap;

let mut map = HashMap::new();
let value = "hoho";

map.entry("poneyland").or_insert_with(|| value);

assert_eq!(map["poneyland"], "hoho");
1.50.0 · Source

pub fn or_insert_with_key<F>(self, default: F) -> &'a mut V
where F: FnOnce(&K) -> V,

Ensures a value is in the entry by inserting, if empty, the result of the default function. This method allows for generating key-derived values for insertion by providing the default function a reference to the key that was moved during the .entry(key) method call.

The reference to the moved key is provided so that cloning or copying the key is unnecessary, unlike with .or_insert_with(|| ... ).

§Examples
use std::collections::HashMap;

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

map.entry("poneyland").or_insert_with_key(|key| key.chars().count());

assert_eq!(map["poneyland"], 9);
1.10.0 · Source

pub fn key(&self) -> &K

Returns a reference to this entry’s key.

§Examples
use std::collections::HashMap;

let mut map: HashMap<&str, u32> = HashMap::new();
assert_eq!(map.entry("poneyland").key(), &"poneyland");
1.26.0 · Source

pub fn and_modify<F>(self, f: F) -> Entry<'a, K, V>
where F: FnOnce(&mut V),

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

§Examples
use std::collections::HashMap;

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

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

map.entry("poneyland")
   .and_modify(|e| { *e += 1 })
   .or_insert(42);
assert_eq!(map["poneyland"], 43);
1.83.0 · Source

pub fn insert_entry(self, value: V) -> OccupiedEntry<'a, K, V>

Sets the value of the entry, and returns an OccupiedEntry.

§Examples
use std::collections::HashMap;

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

assert_eq!(entry.key(), &"poneyland");
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impl<'a, K, V> Entry<'a, K, V>
where V: Default,

1.28.0 · Source

pub fn or_default(self) -> &'a mut V

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 std::collections::HashMap;

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

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

Trait Implementations§

1.12.0 · Source§

impl<K, V> Debug for Entry<'_, K, V>
where K: Debug, V: Debug,

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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, K, V> Freeze for Entry<'a, K, V>
where K: Freeze,

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impl<'a, K, V> RefUnwindSafe for Entry<'a, K, V>

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

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

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

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impl<'a, K, V> !UnwindSafe for Entry<'a, K, V>

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Gets the TypeId of self. Read more
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Immutably borrows from an owned value. Read more
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Causes self to use its Display implementation when Debug-formatted.
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Causes self to use its LowerExp implementation when Debug-formatted.
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Causes self to use its UpperExp implementation when Debug-formatted.
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Causes self to use its UpperHex implementation when Debug-formatted.
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fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Calls .tap_deref() only in debug builds, and is erased in release builds.
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fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
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impl<T> TryConv for T

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fn try_conv<T>(self) -> Result<T, Self::Error>
where Self: TryInto<T>,

Attempts to convert self into T using TryInto<T>. 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<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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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: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.