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//! A double-ended iterator over entity references and entities.
use crate::EntityRef;
use core::iter::Enumerate;
use core::marker::PhantomData;
use core::slice;
/// Iterate over all keys in order.
pub struct Iter<'a, K: EntityRef, V>
where
V: 'a,
{
enumerate: Enumerate<slice::Iter<'a, V>>,
unused: PhantomData<K>,
}
impl<'a, K: EntityRef, V> Iter<'a, K, V> {
/// Create an `Iter` iterator that visits the `PrimaryMap` keys and values
/// of `iter`.
pub fn new(iter: slice::Iter<'a, V>) -> Self {
Self {
enumerate: iter.enumerate(),
unused: PhantomData,
}
}
}
impl<'a, K: EntityRef, V> Iterator for Iter<'a, K, V> {
type Item = (K, &'a V);
fn next(&mut self) -> Option<Self::Item> {
self.enumerate.next().map(|(i, v)| (K::new(i), v))
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.enumerate.size_hint()
}
}
impl<'a, K: EntityRef, V> DoubleEndedIterator for Iter<'a, K, V> {
fn next_back(&mut self) -> Option<Self::Item> {
self.enumerate.next_back().map(|(i, v)| (K::new(i), v))
}
}
impl<'a, K: EntityRef, V> ExactSizeIterator for Iter<'a, K, V> {}
/// Iterate over all keys in order.
pub struct IterMut<'a, K: EntityRef, V>
where
V: 'a,
{
enumerate: Enumerate<slice::IterMut<'a, V>>,
unused: PhantomData<K>,
}
impl<'a, K: EntityRef, V> IterMut<'a, K, V> {
/// Create an `IterMut` iterator that visits the `PrimaryMap` keys and values
/// of `iter`.
pub fn new(iter: slice::IterMut<'a, V>) -> Self {
Self {
enumerate: iter.enumerate(),
unused: PhantomData,
}
}
}
impl<'a, K: EntityRef, V> Iterator for IterMut<'a, K, V> {
type Item = (K, &'a mut V);
fn next(&mut self) -> Option<Self::Item> {
self.enumerate.next().map(|(i, v)| (K::new(i), v))
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.enumerate.size_hint()
}
}
impl<'a, K: EntityRef, V> DoubleEndedIterator for IterMut<'a, K, V> {
fn next_back(&mut self) -> Option<Self::Item> {
self.enumerate.next_back().map(|(i, v)| (K::new(i), v))
}
}
impl<'a, K: EntityRef, V> ExactSizeIterator for IterMut<'a, K, V> {}
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