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>

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!(),
}

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!(),
}