pub struct VacantEntry<'a> { /* private fields */ }
Expand description
A vacant Entry. It is part of the Entry
enum.
Implementations§
Source§impl<'a> VacantEntry<'a>
impl<'a> VacantEntry<'a>
Sourcepub fn key(&self) -> &String
pub fn key(&self) -> &String
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!(),
}
Sourcepub fn insert(self, value: Value) -> &'a mut Value
pub fn insert(self, value: Value) -> &'a mut Value
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> Freeze for VacantEntry<'a>
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§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
Layout§
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.
Size: 56 bytes