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@@ -1,4 +1,5 @@
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//! Trivially-copyable, easily comparable typed [indices](MapIndex), and a [Pool] to contain them
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//! Trivially-copyable, easily comparable typed [indices](MapIndex),
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//! and an [IndexMap] to contain them.
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//!
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//! # Examples
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//!
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@@ -9,8 +10,8 @@
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//! NumbersKey
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//! }
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//!
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//! // then, create a pool with that type
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//! let mut numbers: Pool<i32, NumbersKey> = Pool::new();
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//! // then, create a map with that type
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//! let mut numbers: IndexMap<i32, NumbersKey> = IndexMap::new();
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//! let first = numbers.insert(1);
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//! let second = numbers.insert(2);
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//! let third = numbers.insert(3);
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@@ -27,7 +28,7 @@
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//! assert_eq!(Some(&100000), numbers.get(first));
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//! ```
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/// Creates newtype indices over [`usize`] for use as [Pool] keys.
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/// Creates newtype indices over [`usize`] for use as [IndexMap] keys.
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#[macro_export]
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macro_rules! make_index {($($(#[$meta:meta])* $name:ident),*$(,)?) => {$(
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$(#[$meta])*
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@@ -58,24 +59,22 @@ pub use make_index;
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use self::iter::MapIndexIter;
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/// An index into a [Pool]. For full type-safety,
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/// there should be a unique [InternKey] for each [Pool]
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/// An index into a [IndexMap]. For full type-safety,
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/// there should be a unique [MapIndex] for each [IndexMap].
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pub trait MapIndex: std::fmt::Debug {
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/// Constructs an [`MapIndex`] from a [`usize`] without checking bounds.
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///
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/// # Safety
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///
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/// The provided value should be within the bounds of its associated container.
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// ID::from_raw_unchecked here isn't *actually* unsafe, since bounds should always be
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// checked, however, the function has unverifiable preconditions.
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fn from_usize(value: usize) -> Self;
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/// Gets the index of the [`InternKey`] by value
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/// Gets the index of the [`MapIndex`] by value
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fn get(&self) -> usize;
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}
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#[derive(Clone, Debug, PartialEq, Eq)]
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pub struct IndexMap<K: MapIndex, V> {
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pool: Vec<V>,
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map: Vec<V>,
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id_type: std::marker::PhantomData<K>,
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}
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@@ -84,48 +83,48 @@ impl<V, K: MapIndex> IndexMap<K, V> {
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Self::default()
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}
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pub fn get(&self, index: K) -> Option<&V> {
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self.pool.get(index.get())
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self.map.get(index.get())
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}
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pub fn get_mut(&mut self, index: K) -> Option<&mut V> {
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self.pool.get_mut(index.get())
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self.map.get_mut(index.get())
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}
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pub fn get_many_mut<const N: usize>(
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&mut self,
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indices: [K; N],
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) -> Result<[&mut V; N], GetManyMutError<N>> {
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self.pool.get_many_mut(indices.map(|id| id.get()))
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self.map.get_many_mut(indices.map(|id| id.get()))
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}
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pub fn iter(&self) -> impl Iterator<Item = &V> {
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self.pool.iter()
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self.map.iter()
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}
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pub fn iter_mut(&mut self) -> impl Iterator<Item = &mut V> {
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self.pool.iter_mut()
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self.map.iter_mut()
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}
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pub fn key_iter(&self) -> iter::MapIndexIter<K> {
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// Safety: Pool currently has pool.len() entries, and data cannot be removed
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MapIndexIter::new(0..self.pool.len())
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// Safety: IndexMap currently has map.len() entries, and data cannot be removed
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MapIndexIter::new(0..self.map.len())
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}
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/// Constructs an [ID](InternKey) from a [usize], if it's within bounds
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/// Constructs an [ID](MapIndex) from a [usize], if it's within bounds
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#[doc(hidden)]
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pub fn try_key_from(&self, value: usize) -> Option<K> {
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(value < self.pool.len()).then(|| K::from_usize(value))
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(value < self.map.len()).then(|| K::from_usize(value))
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}
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pub fn insert(&mut self, value: V) -> K {
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let id = self.pool.len();
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self.pool.push(value);
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let id = self.map.len();
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self.map.push(value);
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// Safety: value was pushed to `self.pool[id]`
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// Safety: value was pushed to `self.map[id]`
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K::from_usize(id)
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}
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}
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impl<K: MapIndex, V> Default for IndexMap<K, V> {
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fn default() -> Self {
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Self { pool: vec![], id_type: std::marker::PhantomData }
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Self { map: vec![], id_type: std::marker::PhantomData }
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}
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}
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@@ -133,16 +132,16 @@ impl<K: MapIndex, V> Index<K> for IndexMap<K, V> {
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type Output = V;
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fn index(&self, index: K) -> &Self::Output {
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match self.pool.get(index.get()) {
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None => panic!("Index {:?} out of bounds in pool!", index),
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match self.map.get(index.get()) {
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None => panic!("Index {:?} out of bounds in IndexMap!", index),
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Some(value) => value,
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}
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}
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}
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impl<K: MapIndex, V> IndexMut<K> for IndexMap<K, V> {
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fn index_mut(&mut self, index: K) -> &mut Self::Output {
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match self.pool.get_mut(index.get()) {
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None => panic!("Index {:?} out of bounds in pool!", index),
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match self.map.get_mut(index.get()) {
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None => panic!("Index {:?} out of bounds in IndexMap!", index),
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Some(value) => value,
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}
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}
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@@ -153,11 +152,11 @@ mod iter {
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use super::MapIndex;
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/// Iterates over the keys of a [Pool](super::Pool) independently of the pool itself.
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/// Iterates over the keys of an [IndexMap](super::IndexMap), independently of the map.
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///
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/// This is guaranteed to never overrun the length of the pool,
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/// but is *NOT* guaranteed to iterate over all elements of the pool
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/// if the pool is extended during iteration.
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/// This is guaranteed to never overrun the length of the map,
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/// but is *NOT* guaranteed to iterate over all elements of the map
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/// if the map is extended during iteration.
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#[derive(Clone, Debug, PartialEq, Eq, Hash)]
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pub struct MapIndexIter<K: MapIndex> {
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range: Range<usize>,
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@@ -165,12 +164,12 @@ mod iter {
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}
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impl<K: MapIndex> MapIndexIter<K> {
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/// Creates a new [InternKeyIter] producing the given [InternKey]
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/// Creates a new [MapIndexIter] producing the given [MapIndex]
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///
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/// # Safety:
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/// - Range must not exceed bounds of the associated [Pool](super::Pool)
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/// - Items must not be removed from the pool
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/// - Items must be contiguous within the pool
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/// - Range must not exceed bounds of the associated [IndexMap](super::IndexMap)
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/// - Items must not be removed from the map
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/// - Items must be contiguous within the map
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pub(super) fn new(range: Range<usize>) -> Self {
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Self { range, _id: Default::default() }
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}
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@@ -180,7 +179,7 @@ mod iter {
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type Item = ID;
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fn next(&mut self) -> Option<Self::Item> {
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// Safety: InternKeyIter can only be created by InternKeyIter::new()
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// Safety: MapIndexIter can only be created by MapIndexIter::new()
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Some(ID::from_usize(self.range.next()?))
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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