[−][src]Enum serde_json::map::Entry
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 Map
.
Variants
Vacant(VacantEntry<'a>)
A vacant Entry.
Occupied(OccupiedEntry<'a>)
An occupied Entry.
Implementations
impl<'a> Entry<'a>
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pub fn key(&self) -> &String
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Returns a reference to this entry's key.
Examples
let mut map = serde_json::Map::new(); assert_eq!(map.entry("serde").key(), &"serde");
pub fn or_insert(self, default: Value) -> &'a mut Value
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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
let mut map = serde_json::Map::new(); map.entry("serde").or_insert(json!(12)); assert_eq!(map["serde"], 12);
pub fn or_insert_with<F>(self, default: F) -> &'a mut Value where
F: FnOnce() -> Value,
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F: FnOnce() -> Value,
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
let mut map = serde_json::Map::new(); map.entry("serde").or_insert_with(|| json!("hoho")); assert_eq!(map["serde"], "hoho".to_owned());
Auto Trait Implementations
impl<'a> RefUnwindSafe for Entry<'a>
impl<'a> Send for Entry<'a>
impl<'a> Sync for Entry<'a>
impl<'a> Unpin for Entry<'a>
impl<'a> !UnwindSafe for Entry<'a>
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,