Struct alloc::collections::btree_map::VacantEntry
1.0.0 · source · pub struct VacantEntry<'a, K, V, A: Allocator + Clone = Global> { /* private fields */ }
Expand description
A view into a vacant entry in a BTreeMap
.
It is part of the Entry
enum.
Implementations§
source§impl<'a, K: Ord, V, A: Allocator + Clone> VacantEntry<'a, K, V, A>
impl<'a, K: Ord, V, A: Allocator + Clone> VacantEntry<'a, K, V, A>
sourcepub fn insert(self, value: V) -> &'a mut V
pub fn insert(self, value: V) -> &'a mut V
Sets the value of the entry with the VacantEntry
’s key,
and returns a mutable reference to it.
Examples
use std::collections::BTreeMap;
use std::collections::btree_map::Entry;
let mut map: BTreeMap<&str, u32> = BTreeMap::new();
if let Entry::Vacant(o) = map.entry("poneyland") {
o.insert(37);
}
assert_eq!(map["poneyland"], 37);
Run