Struct SecondaryMap

pub struct SecondaryMap<K, V>
where
    K: EntityRef,
    V: Clone,
{
    pub(crate) elems: Vec<V>,
    pub(crate) default: V,
    pub(crate) unused: PhantomData<K>,
}

A mapping K -> V for densely indexed entity references.

The SecondaryMap data structure uses the dense index space to implement a map with a vector. Unlike PrimaryMap, an SecondaryMap can’t be used to allocate entity references. It is used to associate secondary information with entities.

The map does not track if an entry for a key has been inserted or not. Instead it behaves as if all keys have a default entry from the beginning.

Fields

elems: Vec<V>

default: V

unused: PhantomData<K>

Implementations

impl<K, V> SecondaryMap<K, V>

where K: EntityRef, V: Clone,

Shared SecondaryMap implementation for all value types.

pub fn new() -> Self

where V: Default,

Create a new empty map.

pub fn with_capacity(capacity: usize) -> Self

where V: Default,

Create a new, empty map with the specified capacity.

The map will be able to hold exactly capacity elements without reallocating.

pub fn with_default(default: V) -> Self

Create a new empty map with a specified default value.

This constructor does not require V to implement Default.

pub fn capacity(&self) -> usize

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

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

Get the element at k if it exists.

pub fn is_empty(&self) -> bool

Is this map completely empty?

pub fn clear(&mut self)

Remove all entries from this map.

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

Iterate over all the keys and values in this map.

pub fn iter_mut(&mut self) -> IterMut<'_, K, V>

Iterate over all the keys and values in this map, mutable edition.

pub fn keys(&self) -> Keys<K>

Iterate over all the keys in this map.

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

Iterate over all the values in this map.

pub fn values_mut(&mut self) -> IterMut<'_, V>

Iterate over all the values in this map, mutable edition.

pub fn resize(&mut self, n: usize)

Resize the map to have n entries by adding default entries as needed.

Trait Implementations

impl<K, V> Archive for SecondaryMap<K, V>

where K: EntityRef, V: Clone + Archive, Vec<V>: Archive, PhantomData<K>: Archive,

type Archived = ArchivedSecondaryMap<K, V>

The archived representation of this type.

type Resolver = SecondaryMapResolver<K, V>

The resolver for this type. It must contain all the additional information from serializing needed to make the archived type from the normal type.

fn resolve(&self, resolver: Self::Resolver, out: Place<Self::Archived>)

Creates the archived version of this value at the given position and writes it to the given output.

const COPY_OPTIMIZATION: CopyOptimization<Self> = _

An optimization flag that allows the bytes of this type to be copied directly to a writer instead of calling serialize.

impl<K, V> Clone for SecondaryMap<K, V>

where K: EntityRef + Clone, V: Clone + Clone,

fn clone(&self) -> SecondaryMap<K, V>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<K, V> Debug for SecondaryMap<K, V>

where K: EntityRef + Debug, V: Clone + Debug,

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

Formats the value using the given formatter.

impl<K, V> Default for SecondaryMap<K, V>

where K: EntityRef, V: Clone + Default,

fn default() -> Self

Returns the “default value” for a type.

impl<'de, K, V> Deserialize<'de> for SecondaryMap<K, V>

where K: EntityRef, V: Clone + Deserialize<'de>,

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<__D: Fallible + ?Sized, K, V> Deserialize<SecondaryMap<K, V>, __D> for Archived<SecondaryMap<K, V>>

where K: EntityRef, V: Clone + Archive, Vec<V>: Archive, <Vec<V> as Archive>::Archived: Deserialize<Vec<V>, __D>, <V as Archive>::Archived: Deserialize<V, __D>, PhantomData<K>: Archive, <PhantomData<K> as Archive>::Archived: Deserialize<PhantomData<K>, __D>,

fn deserialize( &self, deserializer: &mut __D, ) -> Result<SecondaryMap<K, V>, <__D as Fallible>::Error>

Deserializes using the given deserializer

impl<K, V> Index<K> for SecondaryMap<K, V>

where K: EntityRef, V: Clone,

Immutable indexing into an SecondaryMap.

All keys are permitted. Untouched entries have the default value.

type Output = V

The returned type after indexing.

fn index(&self, k: K) -> &V

Performs the indexing (container[index]) operation.

impl<K, V> IndexMut<K> for SecondaryMap<K, V>

where K: EntityRef, V: Clone,

Mutable indexing into an SecondaryMap.

The map grows as needed to accommodate new keys.

fn index_mut(&mut self, k: K) -> &mut V

Performs the mutable indexing (container[index]) operation.

impl<K, V> PartialEq for SecondaryMap<K, V>

where K: EntityRef, V: Clone + PartialEq,

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<__S: Fallible + ?Sized, K, V> Serialize<__S> for SecondaryMap<K, V>

where K: EntityRef, V: Clone + Serialize<__S>, Vec<V>: Serialize<__S>, PhantomData<K>: Serialize<__S>,

fn serialize( &self, serializer: &mut __S, ) -> Result<<Self as Archive>::Resolver, <__S as Fallible>::Error>

Writes the dependencies for the object and returns a resolver that can create the archived type.

impl<K, V> Serialize for SecondaryMap<K, V>

where K: EntityRef, V: Clone + PartialEq + Serialize,

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl<K, V> Eq for SecondaryMap<K, V>

where K: EntityRef, V: Clone + PartialEq + Eq,