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use associated type bounds in QueryManyIter and QueryIter::sort() (#14107)

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# Objective

The bounds for query iterators are quite intimidating.

## Solution

With Rust 1.79, [associated type
bounds](https://github.com/rust-lang/rust/pull/122055/) stabilized,
which can simplify the bounds slightly.
This commit is contained in:
Vic 2024-07-02 15:39:22 +02:00 committed by GitHub
parent a58c4f7825
commit 7e0d262d77
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1 changed files with 11 additions and 26 deletions
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37
crates/bevy_ecs/src/query/iter.rs
View file

@ -279,7 +279,7 @@ impl<'w, 's, D: QueryData, F: QueryFilter> QueryIter<'w, 's, D, F> {
/// # schedule.add_systems((system_1, system_2, system_3));
/// # schedule.run(&mut world);
/// ```
pub fn sort<L: ReadOnlyQueryData + 'w>(
pub fn sort<L: ReadOnlyQueryData<Item<'w>: Ord> + 'w>(
self,
) -> QuerySortedIter<
'w,
@ -287,10 +287,7 @@ impl<'w, 's, D: QueryData, F: QueryFilter> QueryIter<'w, 's, D, F> {
D,
F,
impl ExactSizeIterator<Item = Entity> + DoubleEndedIterator + FusedIterator + 'w,
>
where
L::Item<'w>: Ord,
{
> {
// On the first successful iteration of `QueryIterationCursor`, `archetype_entities` or `table_entities`
// will be set to a non-zero value. The correctness of this method relies on this.
// I.e. this sort method will execute if and only if `next` on `QueryIterationCursor` of a
@ -376,7 +373,7 @@ impl<'w, 's, D: QueryData, F: QueryFilter> QueryIter<'w, 's, D, F> {
/// # schedule.add_systems((system_1));
/// # schedule.run(&mut world);
/// ```
pub fn sort_unstable<L: ReadOnlyQueryData + 'w>(
pub fn sort_unstable<L: ReadOnlyQueryData<Item<'w>: Ord> + 'w>(
self,
) -> QuerySortedIter<
'w,
@ -384,10 +381,7 @@ impl<'w, 's, D: QueryData, F: QueryFilter> QueryIter<'w, 's, D, F> {
D,
F,
impl ExactSizeIterator<Item = Entity> + DoubleEndedIterator + FusedIterator + 'w,
>
where
L::Item<'w>: Ord,
{
> {
// On the first successful iteration of `QueryIterationCursor`, `archetype_entities` or `table_entities`
// will be set to a non-zero value. The correctness of this method relies on this.
// I.e. this sort method will execute if and only if `next` on `QueryIterationCursor` of a
@ -1083,10 +1077,7 @@ impl<'w, 's, D: QueryData, F: QueryFilter, I: Iterator<Item = Entity>> Debug
/// Entities that don't match the query are skipped.
///
/// This struct is created by the [`Query::iter_many`](crate::system::Query::iter_many) and [`Query::iter_many_mut`](crate::system::Query::iter_many_mut) methods.
pub struct QueryManyIter<'w, 's, D: QueryData, F: QueryFilter, I: Iterator>
where
I::Item: Borrow<Entity>,
{
pub struct QueryManyIter<'w, 's, D: QueryData, F: QueryFilter, I: Iterator<Item: Borrow<Entity>>> {
entity_iter: I,
entities: &'w Entities,
tables: &'w Tables,
@ -1096,9 +1087,8 @@ where
query_state: &'s QueryState<D, F>,
}
impl<'w, 's, D: QueryData, F: QueryFilter, I: Iterator> QueryManyIter<'w, 's, D, F, I>
where
I::Item: Borrow<Entity>,
impl<'w, 's, D: QueryData, F: QueryFilter, I: Iterator<Item: Borrow<Entity>>>
QueryManyIter<'w, 's, D, F, I>
{
/// # Safety
/// - `world` must have permission to access any of the components registered in `query_state`.
@ -1196,10 +1186,8 @@ where
}
}
impl<'w, 's, D: ReadOnlyQueryData, F: QueryFilter, I: Iterator> Iterator
impl<'w, 's, D: ReadOnlyQueryData, F: QueryFilter, I: Iterator<Item: Borrow<Entity>>> Iterator
for QueryManyIter<'w, 's, D, F, I>
where
I::Item: Borrow<Entity>,
{
type Item = D::Item<'w>;
@ -1216,16 +1204,13 @@ where
}
// This is correct as [`QueryManyIter`] always returns `None` once exhausted.
impl<'w, 's, D: ReadOnlyQueryData, F: QueryFilter, I: Iterator> FusedIterator
impl<'w, 's, D: ReadOnlyQueryData, F: QueryFilter, I: Iterator<Item: Borrow<Entity>>> FusedIterator
for QueryManyIter<'w, 's, D, F, I>
where
I::Item: Borrow<Entity>,
{
}
impl<'w, 's, D: QueryData, F: QueryFilter, I: Iterator> Debug for QueryManyIter<'w, 's, D, F, I>
where
I::Item: Borrow<Entity>,
impl<'w, 's, D: QueryData, F: QueryFilter, I: Iterator<Item: Borrow<Entity>>> Debug
for QueryManyIter<'w, 's, D, F, I>
{
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.debug_struct("QueryManyIter").finish()