Struct parentree::Tree

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pub struct Tree<T>(_);

Implementations§

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pub fn modify_recursive<F, Arg>( &mut self, key: DefaultKey, func: F, arg: Arg ) -> Argwhere F: Fn(&mut T, Arg) -> Arg,

Methods from Deref<Target = DenseSlotMap<DefaultKey, Node<T>>>§

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pub fn len(&self) -> usize

Returns the number of elements in the slot map.

Examples

let mut sm = DenseSlotMap::with_capacity(10);
sm.insert("len() counts actual elements, not capacity");
let key = sm.insert("removed elements don't count either");
sm.remove(key);
assert_eq!(sm.len(), 1);

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pub fn is_empty(&self) -> bool

Returns if the slot map is empty.

Examples

let mut sm = DenseSlotMap::new();
let key = sm.insert("dummy");
assert_eq!(sm.is_empty(), false);
sm.remove(key);
assert_eq!(sm.is_empty(), true);

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pub fn capacity(&self) -> usize

Returns the number of elements the DenseSlotMap can hold without reallocating.

Examples

let sm: DenseSlotMap<_, f64> = DenseSlotMap::with_capacity(10);
assert_eq!(sm.capacity(), 10);

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pub fn contains_key(&self, key: K) -> bool

Returns true if the slot map contains key.

Examples

let mut sm = DenseSlotMap::new();
let key = sm.insert(42);
assert_eq!(sm.contains_key(key), true);
sm.remove(key);
assert_eq!(sm.contains_key(key), false);

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pub fn get(&self, key: K) -> Option<&V>

Returns a reference to the value corresponding to the key.

Examples

let mut sm = DenseSlotMap::new();
let key = sm.insert("bar");
assert_eq!(sm.get(key), Some(&"bar"));
sm.remove(key);
assert_eq!(sm.get(key), None);

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pub unsafe fn get_unchecked(&self, key: K) -> &V

Returns a reference to the value corresponding to the key without version or bounds checking.

Safety

This should only be used if contains_key(key) is true. Otherwise it is potentially unsafe.

Examples

let mut sm = DenseSlotMap::new();
let key = sm.insert("bar");
assert_eq!(unsafe { sm.get_unchecked(key) }, &"bar");
sm.remove(key);
// sm.get_unchecked(key) is now dangerous!

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pub fn iter(&self) -> Iter<'_, K, V>

An iterator visiting all key-value pairs in arbitrary order. The iterator element type is (K, &'a V).

Examples

let mut sm = DenseSlotMap::new();
let k0 = sm.insert(0);
let k1 = sm.insert(1);
let k2 = sm.insert(2);

let mut it = sm.iter();
for (k, v) in sm.iter() {
    println!("key: {:?}, val: {}", k, v);
}

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pub fn keys(&self) -> Keys<'_, K, V>

An iterator visiting all keys in arbitrary order. The iterator element type is K.

Examples

let mut sm = DenseSlotMap::new();
let k0 = sm.insert(10);
let k1 = sm.insert(20);
let k2 = sm.insert(30);
let keys: HashSet<_> = sm.keys().collect();
let check: HashSet<_> = vec![k0, k1, k2].into_iter().collect();
assert_eq!(keys, check);

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pub fn values(&self) -> Values<'_, K, V>

An iterator visiting all values in arbitrary order. The iterator element type is &'a V.

Examples

let mut sm = DenseSlotMap::new();
let k0 = sm.insert(10);
let k1 = sm.insert(20);
let k2 = sm.insert(30);
let values: HashSet<_> = sm.values().collect();
let check: HashSet<_> = vec![&10, &20, &30].into_iter().collect();
assert_eq!(values, check);