[−][src]Struct serde_json::map::VacantEntry

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

A vacant Entry. It is part of the Entry enum.

Methods

impl<'a> VacantEntry<'a>[src]

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

Gets a reference to the key that would be used when inserting a value through the VacantEntry.

Examples

use serde_json::map::Entry;

let mut map = serde_json::Map::new();

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

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

Sets the value of the entry with the VacantEntry's key, and returns a mutable reference to it.

Examples

use serde_json::map::Entry;

let mut map = serde_json::Map::new();

match map.entry("serde") {
    Entry::Vacant(vacant) => {
        vacant.insert(json!("hoho"));
    }
    Entry::Occupied(_) => unimplemented!(),
}

Auto Trait Implementations

impl<'a> RefUnwindSafe for VacantEntry<'a>

impl<'a> Send for VacantEntry<'a>

impl<'a> Sync for VacantEntry<'a>

impl<'a> Unpin for VacantEntry<'a>

impl<'a> !UnwindSafe for VacantEntry<'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.