[−][src]Struct serde_json::map::VacantEntry
A vacant Entry. It is part of the Entry
enum.
Implementations
impl<'a> VacantEntry<'a>
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pub fn key(&self) -> &String
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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
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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,
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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>,