Struct QueryManyIter

pub struct QueryManyIter<'w, 's, D, F, I>
where
    D: QueryData,
    F: QueryFilter,
    I: Iterator,
    <I as Iterator>::Item: EntityEquivalent,
{ /* private fields */ }

An Iterator over the query items generated from an iterator of Entitys.

Items are returned in the order of the provided iterator. Entities that don’t match the query are skipped.

This struct is created by the Query::iter_many and Query::iter_many_mut methods.

Implementations

impl<'w, 's, D, F, I> QueryManyIter<'w, 's, D, F, I>

where D: QueryData, F: QueryFilter, I: Iterator, <I as Iterator>::Item: EntityEquivalent,

pub fn fetch_next(&mut self) -> Option<<D as QueryData>::Item<'_>>

Get next result from the query

Examples found in repository

examples/animation/animation_graph.rs (line 428)

fn update_ui(
    mut text_query: Query<&mut Text>,
    mut background_query: Query<&mut Node, Without<Text>>,
    container_query: Query<(&Children, &ClipNode)>,
    animation_weights_query: Query<&ExampleAnimationWeights, Changed<ExampleAnimationWeights>>,
) {
    for animation_weights in animation_weights_query.iter() {
        for (children, clip_node) in &container_query {
            // Draw the green background color to visually indicate the weight.
            let mut bg_iter = background_query.iter_many_mut(children);
            if let Some(mut node) = bg_iter.fetch_next() {
                // All nodes are the same width, so `NODE_RECTS[0]` is as good as any other.
                node.width =
                    Val::Px(NODE_RECTS[0].width * animation_weights.weights[clip_node.index]);
            }

            // Update the node labels with the current weights.
            let mut text_iter = text_query.iter_many_mut(children);
            if let Some(mut text) = text_iter.fetch_next() {
                **text = format!(
                    "{}\n{:.2}",
                    clip_node.text, animation_weights.weights[clip_node.index]
                );
            }
        }
    }
}

pub fn sort<L>( self, ) -> QuerySortedManyIter<'w, 's, D, F, impl ExactSizeIterator + DoubleEndedIterator + FusedIterator + 'w>

where L: ReadOnlyQueryData + 'w, <L as QueryData>::Item<'lw>: for<'lw> Ord,

Sorts all query items into a new iterator, using the query lens as a key.

This sort is stable (i.e., does not reorder equal elements).

This uses slice::sort internally.

Defining the lens works like transmute_lens. This includes the allowed parameter type changes listed under allowed transmutes. However, the lens uses the filter of the original query when present.

The sort is not cached across system runs.

Unlike the sort methods on QueryIter, this does NOT panic if next/fetch_next has been called on QueryManyIter before.

Examples

// We can ensure that a query always returns in the same order.
fn system_1(query: Query<(Entity, &PartIndex)>) {
    let parts: Vec<(Entity, &PartIndex)> = query.iter_many(entity_list).sort::<&PartIndex>().collect();
}

// We can freely rearrange query components in the key.
fn system_2(query: Query<(&Length, &Width, &Height), With<PartMarker>>) {
    for (length, width, height) in query.iter_many(entity_list).sort::<(&Height, &Length, &Width)>() {
        println!("height: {height:?}, width: {width:?}, length: {length:?}")
    }
}

// You can use `fetch_next_back` to obtain mutable references in reverse order.
fn system_3(
    mut query: Query<&mut PartValue>,
) {
    // We need to collect the internal iterator before iterating mutably
    let mut parent_query_iter = query.iter_many_mut(entity_list)
        .sort::<Entity>();

    let mut scratch_value = 0;
    while let Some(mut part_value) = parent_query_iter.fetch_next_back()
    {
        // some order-dependent operation, here bitwise XOR
        **part_value ^= scratch_value;
        scratch_value = **part_value;
    }
}

pub fn sort_unstable<L>( self, ) -> QuerySortedManyIter<'w, 's, D, F, impl ExactSizeIterator + DoubleEndedIterator + FusedIterator + 'w>

where L: ReadOnlyQueryData + 'w, <L as QueryData>::Item<'lw>: for<'lw> Ord,

Sorts all query items into a new iterator, using the query lens as a key.

This sort is unstable (i.e., may reorder equal elements).

This uses slice::sort_unstable internally.

Defining the lens works like transmute_lens. This includes the allowed parameter type changes listed under allowed transmutes.. However, the lens uses the filter of the original query when present.

The sort is not cached across system runs.

Unlike the sort methods on QueryIter, this does NOT panic if next/fetch_next has been called on QueryManyIter before.

Example

#[derive(Component, PartialEq, Eq, PartialOrd, Ord)]
enum Flying {
    Enabled,
    Disabled
};

// We perform an unstable sort by a Component with few values.
fn system_1(query: Query<&Flying, With<PartMarker>>) {
    let part_values: Vec<&Flying> = query.iter_many(entity_list).sort_unstable::<&Flying>().collect();
}

pub fn sort_by<L>( self, compare: impl FnMut(&<L as QueryData>::Item<'_>, &<L as QueryData>::Item<'_>) -> Ordering, ) -> QuerySortedManyIter<'w, 's, D, F, impl ExactSizeIterator + DoubleEndedIterator + FusedIterator + 'w>

where L: ReadOnlyQueryData + 'w,

Sorts all query items into a new iterator with a comparator function over the query lens.

This sort is stable (i.e., does not reorder equal elements).

This uses slice::sort_by internally.

Defining the lens works like transmute_lens. This includes the allowed parameter type changes listed under allowed transmutes. However, the lens uses the filter of the original query when present.

The sort is not cached across system runs.

Unlike the sort methods on QueryIter, this does NOT panic if next/fetch_next has been called on QueryManyIter before.

Example

#[derive(Component)]
struct PartValue(f32);

// We can use a cmp function on components do not implement Ord.
fn system_1(query: Query<&PartValue>) {
    // Sort part values according to `f32::total_comp`.
    let part_values: Vec<&PartValue> = query
        .iter_many(entity_list)
        .sort_by::<&PartValue>(|value_1, value_2| value_1.total_cmp(*value_2))
        .collect();
}

pub fn sort_unstable_by<L>( self, compare: impl FnMut(&<L as QueryData>::Item<'_>, &<L as QueryData>::Item<'_>) -> Ordering, ) -> QuerySortedManyIter<'w, 's, D, F, impl ExactSizeIterator + DoubleEndedIterator + FusedIterator + 'w>

where L: ReadOnlyQueryData + 'w,

Sorts all query items into a new iterator with a comparator function over the query lens.

This sort is unstable (i.e., may reorder equal elements).

This uses slice::sort_unstable_by internally.

Defining the lens works like transmute_lens. This includes the allowed parameter type changes listed under allowed transmutes. However, the lens uses the filter of the original query when present.

The sort is not cached across system runs.

Unlike the sort methods on QueryIter, this does NOT panic if next/fetch_next has been called on QueryManyIter before.

pub fn sort_by_key<L, K>( self, f: impl FnMut(&<L as QueryData>::Item<'_>) -> K, ) -> QuerySortedManyIter<'w, 's, D, F, impl ExactSizeIterator + DoubleEndedIterator + FusedIterator + 'w>

where L: ReadOnlyQueryData + 'w, K: Ord,

Sorts all query items into a new iterator with a key extraction function over the query lens.

This sort is stable (i.e., does not reorder equal elements).

This uses slice::sort_by_key internally.

Defining the lens works like transmute_lens. This includes the allowed parameter type changes listed under allowed transmutes. However, the lens uses the filter of the original query when present.

The sort is not cached across system runs.

Unlike the sort methods on QueryIter, this does NOT panic if next/fetch_next has been called on QueryManyIter before.

Example

#[derive(Component)]
struct AvailableMarker;

#[derive(Component, PartialEq, Eq, PartialOrd, Ord, Copy, Clone)]
enum Rarity {
  Common,
  Rare,
  Epic,
  Legendary
};

#[derive(Component)]
struct PartValue(f32);

// We can sort with the internals of components that do not implement Ord.
fn system_1(query: Query<(Entity, &PartValue)>) {
    // Sort by the sines of the part values.
    let parts: Vec<(Entity, &PartValue)> = query
        .iter_many(entity_list)
        .sort_by_key::<&PartValue, _>(|value| value.sin() as usize)
        .collect();
}

// We can define our own custom comparison functions over an EntityRef.
fn system_2(query: Query<EntityRef, With<PartMarker>>) {
    // Sort by whether parts are available and their rarity.
    // We want the available legendaries to come first, so we reverse the iterator.
    let parts: Vec<EntityRef> = query.iter_many(entity_list)
        .sort_by_key::<EntityRef, _>(|entity_ref| {
            (
                entity_ref.contains::<AvailableMarker>(),
            )
        })
        .rev()
        .collect();
}

pub fn sort_unstable_by_key<L, K>( self, f: impl FnMut(&<L as QueryData>::Item<'_>) -> K, ) -> QuerySortedManyIter<'w, 's, D, F, impl ExactSizeIterator + DoubleEndedIterator + FusedIterator + 'w>

where L: ReadOnlyQueryData + 'w, K: Ord,

Sorts all query items into a new iterator with a key extraction function over the query lens.

This sort is unstable (i.e., may reorder equal elements).

This uses slice::sort_unstable_by_key internally.

Defining the lens works like transmute_lens. This includes the allowed parameter type changes listed under allowed transmutes. However, the lens uses the filter of the original query when present.

The sort is not cached across system runs.

Unlike the sort methods on QueryIter, this does NOT panic if next/fetch_next has been called on QueryManyIter before.

pub fn sort_by_cached_key<L, K>( self, f: impl FnMut(&<L as QueryData>::Item<'_>) -> K, ) -> QuerySortedManyIter<'w, 's, D, F, impl ExactSizeIterator + DoubleEndedIterator + FusedIterator + 'w>

where L: ReadOnlyQueryData + 'w, K: Ord,

Sort all query items into a new iterator with a key extraction function over the query lens.

This sort is stable (i.e., does not reorder equal elements).

This uses slice::sort_by_cached_key internally.

Defining the lens works like transmute_lens. This includes the allowed parameter type changes listed under allowed transmutes. However, the lens uses the filter of the original query when present.

The sort is not cached across system runs.

Unlike the sort methods on QueryIter, this does NOT panic if next/fetch_next has been called on QueryManyIter before.

impl<'w, 's, D, F, I> QueryManyIter<'w, 's, D, F, I>

where D: QueryData, F: QueryFilter, I: DoubleEndedIterator, <I as Iterator>::Item: EntityEquivalent,

pub fn fetch_next_back(&mut self) -> Option<<D as QueryData>::Item<'_>>

Get next result from the back of the query

Trait Implementations

impl<'w, 's, D, F, I> Debug for QueryManyIter<'w, 's, D, F, I>

where D: QueryData, F: QueryFilter, I: Iterator, <I as Iterator>::Item: EntityEquivalent,

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

Formats the value using the given formatter.

impl<'w, 's, D, F, I> DoubleEndedIterator for QueryManyIter<'w, 's, D, F, I>

where D: ReadOnlyQueryData, F: QueryFilter, I: DoubleEndedIterator, <I as Iterator>::Item: EntityEquivalent,

fn next_back( &mut self, ) -> Option<<QueryManyIter<'w, 's, D, F, I> as Iterator>::Item>

Removes and returns an element from the end of the iterator.

fn advance_back_by(&mut self, n: usize) -> Result<(), NonZero<usize>>

🔬This is a nightly-only experimental API. (iter_advance_by)

Advances the iterator from the back by n elements.

fn nth_back(&mut self, n: usize) -> Option<Self::Item>

Returns the nth element from the end of the iterator.

fn try_rfold<B, F, R>(&mut self, init: B, f: F) -> R

where Self: Sized, F: FnMut(B, Self::Item) -> R, R: Try<Output = B>,

This is the reverse version of Iterator::try_fold(): it takes elements starting from the back of the iterator.

fn rfold<B, F>(self, init: B, f: F) -> B

where Self: Sized, F: FnMut(B, Self::Item) -> B,

An iterator method that reduces the iterator’s elements to a single, final value, starting from the back.

fn rfind<P>(&mut self, predicate: P) -> Option<Self::Item>

where Self: Sized, P: FnMut(&Self::Item) -> bool,

Searches for an element of an iterator from the back that satisfies a predicate.

impl<'w, 's, F, I> EntitySetIterator for QueryManyIter<'w, 's, Entity, F, I>

where F: QueryFilter, I: EntitySetIterator,

fn collect_set<B>(self) -> B

where B: FromEntitySetIterator<Self::Item>, Self: Sized,

Transforms an EntitySetIterator into a collection.

impl<'w, 's, D, F, I> Iterator for QueryManyIter<'w, 's, D, F, I>

where D: ReadOnlyQueryData, F: QueryFilter, I: Iterator, <I as Iterator>::Item: EntityEquivalent,

type Item = <D as QueryData>::Item<'w>

The type of the elements being iterated over.

fn next(&mut self) -> Option<<QueryManyIter<'w, 's, D, F, I> as Iterator>::Item>

Advances the iterator and returns the next value.

fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the iterator.

fn next_chunk<const N: usize>( &mut self, ) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>

where Self: Sized,

🔬This is a nightly-only experimental API. (iter_next_chunk)

Advances the iterator and returns an array containing the next N values.

fn count(self) -> usize

where Self: Sized,

Consumes the iterator, counting the number of iterations and returning it.

fn last(self) -> Option<Self::Item>

where Self: Sized,

Consumes the iterator, returning the last element.

fn advance_by(&mut self, n: usize) -> Result<(), NonZero<usize>>

🔬This is a nightly-only experimental API. (iter_advance_by)

Advances the iterator by n elements.

fn nth(&mut self, n: usize) -> Option<Self::Item>

Returns the nth element of the iterator.

fn step_by(self, step: usize) -> StepBy<Self>

where Self: Sized,

Creates an iterator starting at the same point, but stepping by the given amount at each iteration.

fn chain<U>(self, other: U) -> Chain<Self, <U as IntoIterator>::IntoIter>

where Self: Sized, U: IntoIterator<Item = Self::Item>,

Takes two iterators and creates a new iterator over both in sequence.

fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter>

where Self: Sized, U: IntoIterator,

‘Zips up’ two iterators into a single iterator of pairs.

fn intersperse(self, separator: Self::Item) -> Intersperse<Self>

where Self: Sized, Self::Item: Clone,

🔬This is a nightly-only experimental API. (iter_intersperse)

Creates a new iterator which places a copy of separator between adjacent items of the original iterator.

fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G>

where Self: Sized, G: FnMut() -> Self::Item,

🔬This is a nightly-only experimental API. (iter_intersperse)

Creates a new iterator which places an item generated by separator between adjacent items of the original iterator.

fn map<B, F>(self, f: F) -> Map<Self, F>

where Self: Sized, F: FnMut(Self::Item) -> B,

Takes a closure and creates an iterator which calls that closure on each element.

fn for_each<F>(self, f: F)

where Self: Sized, F: FnMut(Self::Item),

Calls a closure on each element of an iterator.

fn filter<P>(self, predicate: P) -> Filter<Self, P>

where Self: Sized, P: FnMut(&Self::Item) -> bool,

Creates an iterator which uses a closure to determine if an element should be yielded.

fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F>

where Self: Sized, F: FnMut(Self::Item) -> Option<B>,

Creates an iterator that both filters and maps.

fn enumerate(self) -> Enumerate<Self>

where Self: Sized,

Creates an iterator which gives the current iteration count as well as the next value.

fn peekable(self) -> Peekable<Self>

where Self: Sized,

Creates an iterator which can use the peek and peek_mut methods to look at the next element of the iterator without consuming it. See their documentation for more information.

fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>

where Self: Sized, P: FnMut(&Self::Item) -> bool,

Creates an iterator that skips elements based on a predicate.

fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>

where Self: Sized, P: FnMut(&Self::Item) -> bool,

Creates an iterator that yields elements based on a predicate.

fn map_while<B, P>(self, predicate: P) -> MapWhile<Self, P>

where Self: Sized, P: FnMut(Self::Item) -> Option<B>,

Creates an iterator that both yields elements based on a predicate and maps.

fn skip(self, n: usize) -> Skip<Self>

where Self: Sized,

Creates an iterator that skips the first n elements.

fn take(self, n: usize) -> Take<Self>

where Self: Sized,

Creates an iterator that yields the first n elements, or fewer if the underlying iterator ends sooner.

fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F>

where Self: Sized, F: FnMut(&mut St, Self::Item) -> Option<B>,

An iterator adapter which, like fold, holds internal state, but unlike fold, produces a new iterator.

fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>

where Self: Sized, U: IntoIterator, F: FnMut(Self::Item) -> U,

Creates an iterator that works like map, but flattens nested structure.

fn flatten(self) -> Flatten<Self>

where Self: Sized, Self::Item: IntoIterator,

Creates an iterator that flattens nested structure.

fn map_windows<F, R, const N: usize>(self, f: F) -> MapWindows<Self, F, N>

where Self: Sized, F: FnMut(&[Self::Item; N]) -> R,

🔬This is a nightly-only experimental API. (iter_map_windows)

Calls the given function f for each contiguous window of size N over self and returns an iterator over the outputs of f. Like slice::windows(), the windows during mapping overlap as well.

fn fuse(self) -> Fuse<Self>

where Self: Sized,

Creates an iterator which ends after the first None.

fn inspect<F>(self, f: F) -> Inspect<Self, F>

where Self: Sized, F: FnMut(&Self::Item),

Does something with each element of an iterator, passing the value on.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Iterator.

fn collect<B>(self) -> B

where B: FromIterator<Self::Item>, Self: Sized,

Transforms an iterator into a collection.

fn try_collect<B>( &mut self, ) -> <<Self::Item as Try>::Residual as Residual<B>>::TryType

where Self: Sized, Self::Item: Try, <Self::Item as Try>::Residual: Residual<B>, B: FromIterator<<Self::Item as Try>::Output>,

🔬This is a nightly-only experimental API. (iterator_try_collect)

Fallibly transforms an iterator into a collection, short circuiting if a failure is encountered.

fn collect_into<E>(self, collection: &mut E) -> &mut E

where E: Extend<Self::Item>, Self: Sized,

🔬This is a nightly-only experimental API. (iter_collect_into)

Collects all the items from an iterator into a collection.

fn partition<B, F>(self, f: F) -> (B, B)

where Self: Sized, B: Default + Extend<Self::Item>, F: FnMut(&Self::Item) -> bool,

Consumes an iterator, creating two collections from it.

fn partition_in_place<'a, T, P>(self, predicate: P) -> usize

where T: 'a, Self: Sized + DoubleEndedIterator<Item = &'a mut T>, P: FnMut(&T) -> bool,

🔬This is a nightly-only experimental API. (iter_partition_in_place)

Reorders the elements of this iterator in-place according to the given predicate, such that all those that return true precede all those that return false. Returns the number of true elements found.

fn is_partitioned<P>(self, predicate: P) -> bool

where Self: Sized, P: FnMut(Self::Item) -> bool,

🔬This is a nightly-only experimental API. (iter_is_partitioned)

Checks if the elements of this iterator are partitioned according to the given predicate, such that all those that return true precede all those that return false.

fn try_fold<B, F, R>(&mut self, init: B, f: F) -> R

where Self: Sized, F: FnMut(B, Self::Item) -> R, R: Try<Output = B>,

An iterator method that applies a function as long as it returns successfully, producing a single, final value.

fn try_for_each<F, R>(&mut self, f: F) -> R

where Self: Sized, F: FnMut(Self::Item) -> R, R: Try<Output = ()>,

An iterator method that applies a fallible function to each item in the iterator, stopping at the first error and returning that error.

fn fold<B, F>(self, init: B, f: F) -> B

where Self: Sized, F: FnMut(B, Self::Item) -> B,

Folds every element into an accumulator by applying an operation, returning the final result.

fn reduce<F>(self, f: F) -> Option<Self::Item>

where Self: Sized, F: FnMut(Self::Item, Self::Item) -> Self::Item,

Reduces the elements to a single one, by repeatedly applying a reducing operation.

fn try_reduce<R>( &mut self, f: impl FnMut(Self::Item, Self::Item) -> R, ) -> <<R as Try>::Residual as Residual<Option<<R as Try>::Output>>>::TryType

where Self: Sized, R: Try<Output = Self::Item>, <R as Try>::Residual: Residual<Option<Self::Item>>,

🔬This is a nightly-only experimental API. (iterator_try_reduce)

Reduces the elements to a single one by repeatedly applying a reducing operation. If the closure returns a failure, the failure is propagated back to the caller immediately.

fn all<F>(&mut self, f: F) -> bool

where Self: Sized, F: FnMut(Self::Item) -> bool,

Tests if every element of the iterator matches a predicate.

fn any<F>(&mut self, f: F) -> bool

where Self: Sized, F: FnMut(Self::Item) -> bool,

Tests if any element of the iterator matches a predicate.

fn find<P>(&mut self, predicate: P) -> Option<Self::Item>

where Self: Sized, P: FnMut(&Self::Item) -> bool,

Searches for an element of an iterator that satisfies a predicate.

fn find_map<B, F>(&mut self, f: F) -> Option<B>

where Self: Sized, F: FnMut(Self::Item) -> Option<B>,

Applies function to the elements of iterator and returns the first non-none result.

fn try_find<R>( &mut self, f: impl FnMut(&Self::Item) -> R, ) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryType

where Self: Sized, R: Try<Output = bool>, <R as Try>::Residual: Residual<Option<Self::Item>>,

🔬This is a nightly-only experimental API. (try_find)

Applies function to the elements of iterator and returns the first true result or the first error.

fn position<P>(&mut self, predicate: P) -> Option<usize>

where Self: Sized, P: FnMut(Self::Item) -> bool,

Searches for an element in an iterator, returning its index.

fn rposition<P>(&mut self, predicate: P) -> Option<usize>

where P: FnMut(Self::Item) -> bool, Self: Sized + ExactSizeIterator + DoubleEndedIterator,

Searches for an element in an iterator from the right, returning its index.

fn max(self) -> Option<Self::Item>

where Self: Sized, Self::Item: Ord,

Returns the maximum element of an iterator.

fn min(self) -> Option<Self::Item>

where Self: Sized, Self::Item: Ord,

Returns the minimum element of an iterator.

fn max_by_key<B, F>(self, f: F) -> Option<Self::Item>

where B: Ord, Self: Sized, F: FnMut(&Self::Item) -> B,

Returns the element that gives the maximum value from the specified function.

fn max_by<F>(self, compare: F) -> Option<Self::Item>

where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Ordering,

Returns the element that gives the maximum value with respect to the specified comparison function.

fn min_by_key<B, F>(self, f: F) -> Option<Self::Item>

where B: Ord, Self: Sized, F: FnMut(&Self::Item) -> B,

Returns the element that gives the minimum value from the specified function.

fn min_by<F>(self, compare: F) -> Option<Self::Item>

where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Ordering,

Returns the element that gives the minimum value with respect to the specified comparison function.

fn rev(self) -> Rev<Self>

where Self: Sized + DoubleEndedIterator,

Reverses an iterator’s direction.

fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB)

where FromA: Default + Extend<A>, FromB: Default + Extend<B>, Self: Sized + Iterator<Item = (A, B)>,

Converts an iterator of pairs into a pair of containers.

fn copied<'a, T>(self) -> Copied<Self>

where T: 'a + Copy, Self: Sized + Iterator<Item = &'a T>,

Creates an iterator which copies all of its elements.

fn cloned<'a, T>(self) -> Cloned<Self>

where T: 'a + Clone, Self: Sized + Iterator<Item = &'a T>,

Creates an iterator which clones all of its elements.

fn cycle(self) -> Cycle<Self>

where Self: Sized + Clone,

Repeats an iterator endlessly.

fn array_chunks<const N: usize>(self) -> ArrayChunks<Self, N>

where Self: Sized,

🔬This is a nightly-only experimental API. (iter_array_chunks)

Returns an iterator over N elements of the iterator at a time.

fn sum<S>(self) -> S

where Self: Sized, S: Sum<Self::Item>,

Sums the elements of an iterator.

fn product<P>(self) -> P

where Self: Sized, P: Product<Self::Item>,

Iterates over the entire iterator, multiplying all the elements

fn cmp<I>(self, other: I) -> Ordering

where I: IntoIterator<Item = Self::Item>, Self::Item: Ord, Self: Sized,

Lexicographically compares the elements of this Iterator with those of another.

fn cmp_by<I, F>(self, other: I, cmp: F) -> Ordering

where Self: Sized, I: IntoIterator, F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Ordering,

🔬This is a nightly-only experimental API. (iter_order_by)

Lexicographically compares the elements of this Iterator with those of another with respect to the specified comparison function.

fn partial_cmp<I>(self, other: I) -> Option<Ordering>

where I: IntoIterator, Self::Item: PartialOrd<<I as IntoIterator>::Item>, Self: Sized,

Lexicographically compares the PartialOrd elements of this Iterator with those of another. The comparison works like short-circuit evaluation, returning a result without comparing the remaining elements. As soon as an order can be determined, the evaluation stops and a result is returned.

fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>

where Self: Sized, I: IntoIterator, F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Option<Ordering>,

🔬This is a nightly-only experimental API. (iter_order_by)

Lexicographically compares the elements of this Iterator with those of another with respect to the specified comparison function.

fn eq<I>(self, other: I) -> bool

where I: IntoIterator, Self::Item: PartialEq<<I as IntoIterator>::Item>, Self: Sized,

Determines if the elements of this Iterator are equal to those of another.

fn eq_by<I, F>(self, other: I, eq: F) -> bool

where Self: Sized, I: IntoIterator, F: FnMut(Self::Item, <I as IntoIterator>::Item) -> bool,

🔬This is a nightly-only experimental API. (iter_order_by)

Determines if the elements of this Iterator are equal to those of another with respect to the specified equality function.

fn ne<I>(self, other: I) -> bool

where I: IntoIterator, Self::Item: PartialEq<<I as IntoIterator>::Item>, Self: Sized,

Determines if the elements of this Iterator are not equal to those of another.

fn lt<I>(self, other: I) -> bool

where I: IntoIterator, Self::Item: PartialOrd<<I as IntoIterator>::Item>, Self: Sized,

Determines if the elements of this Iterator are lexicographically less than those of another.

fn le<I>(self, other: I) -> bool

where I: IntoIterator, Self::Item: PartialOrd<<I as IntoIterator>::Item>, Self: Sized,

Determines if the elements of this Iterator are lexicographically less or equal to those of another.

fn gt<I>(self, other: I) -> bool

where I: IntoIterator, Self::Item: PartialOrd<<I as IntoIterator>::Item>, Self: Sized,

Determines if the elements of this Iterator are lexicographically greater than those of another.

fn ge<I>(self, other: I) -> bool

where I: IntoIterator, Self::Item: PartialOrd<<I as IntoIterator>::Item>, Self: Sized,

Determines if the elements of this Iterator are lexicographically greater than or equal to those of another.

fn is_sorted(self) -> bool

where Self: Sized, Self::Item: PartialOrd,

Checks if the elements of this iterator are sorted.

fn is_sorted_by<F>(self, compare: F) -> bool

where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> bool,

Checks if the elements of this iterator are sorted using the given comparator function.

fn is_sorted_by_key<F, K>(self, f: F) -> bool

where Self: Sized, F: FnMut(Self::Item) -> K, K: PartialOrd,

Checks if the elements of this iterator are sorted using the given key extraction function.

impl<'w, 's, D, F, I> FusedIterator for QueryManyIter<'w, 's, D, F, I>

where D: ReadOnlyQueryData, F: QueryFilter, I: Iterator, <I as Iterator>::Item: EntityEquivalent,