Enum serde_json::map::Entry[][src]

pub enum Entry<'a> {
    Vacant(VacantEntry<'a>),
    Occupied(OccupiedEntry<'a>),
}

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>[src]

pub fn key(&self) -> &String[src]

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[src]

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
[src]

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());

pub fn and_modify<F>(self, f: F) -> Self where
    F: FnOnce(&mut Value), 
[src]

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

Examples

let mut map = serde_json::Map::new();
map.entry("serde")
    .and_modify(|e| *e = json!("rust"))
    .or_insert(json!("cpp"));

assert_eq!(map["serde"], "cpp");

map.entry("serde")
    .and_modify(|e| *e = json!("rust"))
    .or_insert(json!("cpp"));

assert_eq!(map["serde"], "rust");

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
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.