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

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

Variants

Vacant(VacantEntry<'a>)

A vacant Entry.

Tuple Fields of Vacant

0: VacantEntry<'a>
Occupied(OccupiedEntry<'a>)

An occupied Entry.

Tuple Fields of Occupied

0: OccupiedEntry<'a>

Implementations

Returns a reference to this entry’s key.

Examples

let mut map = serde_json::Map::new();
assert_eq!(map.entry("serde").key(), &"serde");

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);

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());

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

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.