# serde_json::map::OccupiedEntry - Rust
API documentation for the Rust `OccupiedEntry` struct in crate `serde_json`.
Keywords: rust, rustlang, rust-lang, OccupiedEntry

# Struct serde_json::map::OccupiedEntry [−] [src]

    pub struct OccupiedEntry<'a> { /* fields omitted */ }

An occupied Entry. It is part of the `Entry` enum.

## Implementations

### `impl<'a> OccupiedEntry<'a>` [src]

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

Gets a reference to the key in the entry.

# Examples

    use serde_json::map::Entry;

    let mut map = serde_json::Map::new();
    map.insert("serde".to_owned(), json!(12));

    match map.entry("serde") {
        Entry::Occupied(occupied) => {
            assert_eq!(occupied.key(), &"serde");
        }
        Entry::Vacant(_) => unimplemented!(),
    }

#### `pub fn get(&self) -> &Value` [src]

Gets a reference to the value in the entry.

# Examples

    use serde_json::map::Entry;

    let mut map = serde_json::Map::new();
    map.insert("serde".to_owned(), json!(12));

    match map.entry("serde") {
        Entry::Occupied(occupied) => {
            assert_eq!(occupied.get(), 12);
        }
        Entry::Vacant(_) => unimplemented!(),
    }

#### `pub fn get_mut(&mut self) -> &mut Value` [src]

Gets a mutable reference to the value in the entry.

# Examples

    use serde_json::map::Entry;

    let mut map = serde_json::Map::new();
    map.insert("serde".to_owned(), json!([1, 2, 3]));

    match map.entry("serde") {
        Entry::Occupied(mut occupied) => {
            occupied.get_mut().as_array_mut().unwrap().push(json!(4));
        }
        Entry::Vacant(_) => unimplemented!(),
    }

    assert_eq!(map["serde"].as_array().unwrap().len(), 4);

#### `pub fn into_mut(self) -> &'a mut Value` [src]

Converts the entry into a mutable reference to its value.

# Examples

    use serde_json::map::Entry;

    let mut map = serde_json::Map::new();
    map.insert("serde".to_owned(), json!([1, 2, 3]));

    match map.entry("serde") {
        Entry::Occupied(mut occupied) => {
            occupied.into_mut().as_array_mut().unwrap().push(json!(4));
        }
        Entry::Vacant(_) => unimplemented!(),
    }

    assert_eq!(map["serde"].as_array().unwrap().len(), 4);

#### `pub fn insert(&mut self, value: Value) -> Value` [src]

Sets the value of the entry with the `OccupiedEntry`'s key, and returns the entry's old value.

# Examples

    use serde_json::map::Entry;

    let mut map = serde_json::Map::new();
    map.insert("serde".to_owned(), json!(12));

    match map.entry("serde") {
        Entry::Occupied(mut occupied) => {
            assert_eq!(occupied.insert(json!(13)), 12);
            assert_eq!(occupied.get(), 13);
        }
        Entry::Vacant(_) => unimplemented!(),
    }

#### `pub fn remove(self) -> Value` [src]

Takes the value of the entry out of the map, and returns it.

# Examples

    use serde_json::map::Entry;

    let mut map = serde_json::Map::new();
    map.insert("serde".to_owned(), json!(12));

    match map.entry("serde") {
        Entry::Occupied(occupied) => {
            assert_eq!(occupied.remove(), 12);
        }
        Entry::Vacant(_) => unimplemented!(),
    }

## Auto Trait Implementations

### `impl<'a> RefUnwindSafe for OccupiedEntry<'a>` [src]

### `impl<'a> Send for OccupiedEntry<'a>` [src]

### `impl<'a> Sync for OccupiedEntry<'a>` [src]

### `impl<'a> Unpin for OccupiedEntry<'a>` [src]

### `impl<'a> !UnwindSafe for OccupiedEntry<'a>` [src]

## Blanket Implementations

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `pub fn type_id(&self) -> TypeId` [src]

Gets the `TypeId` of `self`. Read more

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

#### `pub fn borrow(&self) -> &Tⓘ

### Notable traits for &'_ mut R

`impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;`
` [src]

Immutably borrows from an owned value. Read more

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

#### `pub fn borrow_mut(&mut self) -> &mut Tⓘ

### Notable traits for &'_ mut R

`impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;`
` [src]

Mutably borrows from an owned value. Read more

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

#### `pub fn from(t: T) -> T` [src]

Performs the conversion.

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

#### `pub fn into(self) -> U` [src]

Performs the conversion.

### `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.

#### `pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>` [src]

Performs the conversion.

### `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.

#### `pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>` [src]

Performs the conversion.