Struct hetero_container::OccupiedEntry

pub struct OccupiedEntry<'a, V> { /* fields omitted */ }

A view into an occupied entry in a HeteroContainer. It is part of the Entry enum.

Implementations

impl<'a, V: 'static> OccupiedEntry<'a, V>

pub fn key(&self) -> &TypeId

Gets a reference to the key in the container.

Examples

use hetero_container::HeteroContainer;
use std::any::TypeId;

let mut container: HeteroContainer = HeteroContainer::new();
container.entry().or_insert("hello");
assert_eq!(container.entry::<&str>().key(), &TypeId::of::<&str>());

pub fn insert(&mut self, value: V) -> V

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

Examples

use hetero_container::{HeteroContainer, Entry};

let mut container: HeteroContainer = HeteroContainer::new();

if let Entry::Vacant(o, _) = container.entry() {
    o.insert("hello world");
}
assert_eq!(container.get::<&str>(), Some(&"hello world"));

pub fn remove(self) -> V

Takes the value out of the entry, and returns it.

Examples

use hetero_container::{HeteroContainer, Entry};

let mut container: HeteroContainer = HeteroContainer::new();
container.entry().or_insert("hello");

if let Entry::Occupied(o, _) = container.entry::<&str>() {
    assert_eq!(o.remove(), "hello");
}

assert_eq!(container.contains::<&str>(), false);

pub fn get(&self) -> &V

Gets a reference to the value in the entry.

Examples

use hetero_container::{HeteroContainer, Entry};

let mut container: HeteroContainer = HeteroContainer::new();
container.entry().or_insert("hello");

if let Entry::Occupied(o, _) = container.entry::<&str>() {
    assert_eq!(o.get(), &"hello")
}

pub fn get_mut(&mut self) -> &mut V

Gets a mutable reference to the value in the entry.

If you need a reference to the OccupiedEntry which may outlive the destruction of the Entry value, see into_mut.

Examples

use hetero_container::{HeteroContainer, Entry};

let mut container: HeteroContainer = HeteroContainer::new();
container.entry().or_insert(12);

assert_eq!(container.get::<i32>(), Some(&12));
if let Entry::Occupied(mut o, _) = container.entry::<i32>() {
    *o.get_mut() += 10;
    assert_eq!(*o.get(), 22);

    // We can use the same Entry multiple times.
    *o.get_mut() += 2;
}

pub fn into_mut(self) -> &'a mut V

Converts the OccupiedEntry into a mutable reference to the value in the entry with a lifetime bound to the map itself.

If you need multiple references to the OccupiedEntry, see get_mut.

Examples

use hetero_container::{HeteroContainer, Entry};

let mut container: HeteroContainer = HeteroContainer::new();
container.entry().or_insert(12);

assert_eq!(container.get::<i32>(), Some(&12));
if let Entry::Occupied(o, _) = container.entry::<i32>() {
    *o.into_mut() += 10;
}

assert_eq!(container.get::<i32>(), Some(&22))

Trait Implementations

impl<'a, V: Debug> Debug for OccupiedEntry<'a, V>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.