MapVec

veloren_world::util::map_vec

Struct MapVec 

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pub struct MapVec<K, T> {
    entries: DHashMap<K, T>,
    default: T,
}
Expand description

A static table of known values where any key always maps to a single value.

It’s not really intended to be a “collection” in the same way that, say, HashMap or Vec is Since it’s not intended to have a way of expressing that a value is not present (hence the default behaviour) It’s really quite specifically tailored to its application in the economy code where it wouldn’t make sense to not have certain entries Store is a bit different in that it is the one to generate an index, and so it can hold as many things as you like Whereas with MapVec, we always know the index ahead of time.

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§entries: DHashMap<K, T>

We use this hasher (FxHasher32) because (1) we don’t care about DDOS attacks (ruling out SipHash); (2) we care about determinism across computers (ruling out AAHash); (3) we have 1-byte keys (for which FxHash is supposedly fastest).

§default: T

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impl<K: Copy + Eq + Hash, T: Clone> MapVec<K, T>

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pub fn from_list<'a>( i: impl IntoIterator<Item = &'a (K, T)>, default: T, ) -> Self
where K: 'a, T: 'a,

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pub fn from_iter(i: impl Iterator<Item = (K, T)>, default: T) -> Self

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pub fn from_default(default: T) -> Self

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pub fn get_mut(&mut self, entry: K) -> &mut T

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pub fn get(&self, entry: K) -> &T

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pub fn map<U: Default>(self, f: impl FnMut(K, T) -> U) -> MapVec<K, U>

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pub fn iter(&self) -> impl Iterator<Item = (K, &T)> + '_

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pub fn iter_mut(&mut self) -> impl Iterator<Item = (K, &mut T)> + '_

Trait Implementations§

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impl<K: Clone, T: Clone> Clone for MapVec<K, T>

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fn clone(&self) -> MapVec<K, T>

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<K: Debug, T: Debug> Debug for MapVec<K, T>

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

Formats the value using the given formatter. Read more
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impl<K, T: Default> Default for MapVec<K, T>

Need manual implementation of Default since K doesn’t need that bound.

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<K: Copy + Eq + Hash, T: Clone> Index<K> for MapVec<K, T>

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type Output = T

The returned type after indexing.
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fn index(&self, entry: K) -> &Self::Output

Performs the indexing (container[index]) operation. Read more
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impl<K: Copy + Eq + Hash, T: Clone> IndexMut<K> for MapVec<K, T>

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fn index_mut(&mut self, entry: K) -> &mut Self::Output

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

Auto Trait Implementations§

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impl<K, T> Freeze for MapVec<K, T>
where T: Freeze,

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impl<K, T> RefUnwindSafe for MapVec<K, T>
where T: RefUnwindSafe, K: RefUnwindSafe,

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impl<K, T> Send for MapVec<K, T>
where T: Send, K: Send,

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impl<K, T> Sync for MapVec<K, T>
where T: Sync, K: Sync,

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impl<K, T> Unpin for MapVec<K, T>
where T: Unpin, K: Unpin,

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impl<K, T> UnwindSafe for MapVec<K, T>
where T: UnwindSafe, K: UnwindSafe,

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where T: 'static + ?Sized,

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Casts the value.
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Immutably borrows from an owned value. Read more
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🔬This is a nightly-only experimental API. (clone_to_uninit)
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