bevy_render::view::visibility

Struct PreviousVisibleEntities

Source 
pub struct PreviousVisibleEntities(/* private fields */);
Expand description

Stores all entities that were visible in the previous frame.

As systems that check visibility judge entities visible, they remove them from this set. Afterward, the mark_newly_hidden_entities_invisible system runs and marks every mesh still remaining in this set as hidden.

Methods from Deref<Target = EntityHashSet>§

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pub fn len(&self) -> usize

Returns the number of elements in the set.

Source

pub fn is_empty(&self) -> bool

Returns true if the set contains no elements.

Source

pub fn drain(&mut self) -> Drain<'_>

Clears the set, returning all elements in an iterator.

Equivalent to HashSet::drain.

Source

pub fn iter(&self) -> Iter<'_>

An iterator visiting all elements in arbitrary order. The iterator element type is &'a Entity.

Equivalent to HashSet::iter.

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pub fn extract_if<F>(&mut self, f: F) -> ExtractIf<'_, F>
where F: FnMut(&Entity) -> bool,

Drains elements which are true under the given predicate, and returns an iterator over the removed items.

Equivalent to HashSet::extract_if.

Methods from Deref<Target = HashSet<Entity, EntityHash>>§

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pub fn capacity(&self) -> usize

Returns the number of elements the set can hold without reallocating.

Refer to capacity for further details.

§Examples
let map = HashSet::with_capacity(5);

assert!(map.capacity() >= 5);
Source

pub fn iter(&self) -> Iter<'_, T> ⓘ

An iterator visiting all elements in arbitrary order. The iterator element type is &'a T.

Refer to iter for further details.

§Examples
let mut map = HashSet::new();

map.insert("foo");
map.insert("bar");
map.insert("baz");

for value in map.iter() {
    // "foo", "bar", "baz"
    // Note that the above order is not guaranteed
}
Source

pub fn len(&self) -> usize

Returns the number of elements in the set.

Refer to len for further details.

§Examples
let mut map = HashSet::new();

assert_eq!(map.len(), 0);

map.insert("foo");

assert_eq!(map.len(), 1);
Source

pub fn is_empty(&self) -> bool

Returns true if the set contains no elements.

Refer to is_empty for further details.

§Examples
let mut map = HashSet::new();

assert!(map.is_empty());

map.insert("foo");

assert!(!map.is_empty());
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pub fn drain(&mut self) -> Drain<'_, T> ⓘ

Clears the set, returning all elements in an iterator.

Refer to drain for further details.

§Examples
let mut map = HashSet::new();

map.insert("foo");
map.insert("bar");
map.insert("baz");

for value in map.drain() {
    // "foo", "bar", "baz"
    // Note that the above order is not guaranteed
}

assert!(map.is_empty());
Source

pub fn retain<F>(&mut self, f: F)
where F: FnMut(&T) -> bool,

Retains only the elements specified by the predicate.

Refer to retain for further details.

§Examples
let mut map = HashSet::new();

map.insert("foo");
map.insert("bar");
map.insert("baz");

map.retain(|value| *value == "baz");

assert_eq!(map.len(), 1);
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pub fn extract_if<F>(&mut self, f: F) -> ExtractIf<'_, T, F> ⓘ
where F: FnMut(&T) -> bool,

Drains elements which are true under the given predicate, and returns an iterator over the removed items.

Refer to extract_if for further details.

§Examples
let mut map = HashSet::new();

map.insert("foo");
map.insert("bar");
map.insert("baz");

let extracted = map
    .extract_if(|value| *value == "baz")
    .collect::<Vec<_>>();

assert_eq!(map.len(), 2);
assert_eq!(extracted.len(), 1);
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pub fn clear(&mut self)

Clears the set, removing all values.

Refer to clear for further details.

§Examples
let mut map = HashSet::new();

map.insert("foo");
map.insert("bar");
map.insert("baz");

map.clear();

assert!(map.is_empty());
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pub fn hasher(&self) -> &S

Returns a reference to the set’s BuildHasher.

Refer to hasher for further details.

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pub fn reserve(&mut self, additional: usize)

Reserves capacity for at least additional more elements to be inserted in the HashSet. The collection may reserve more space to avoid frequent reallocations.

Refer to reserve for further details.

§Examples
let mut map = HashSet::with_capacity(5);

assert!(map.capacity() >= 5);

map.reserve(10);

assert!(map.capacity() - map.len() >= 10);
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pub fn try_reserve(&mut self, additional: usize) -> Result<(), TryReserveError>

Tries to reserve capacity for at least additional more elements to be inserted in the given HashSet<K,V>. The collection may reserve more space to avoid frequent reallocations.

Refer to try_reserve for further details.

§Examples
let mut map = HashSet::with_capacity(5);

assert!(map.capacity() >= 5);

map.try_reserve(10).expect("Out of Memory!");

assert!(map.capacity() - map.len() >= 10);
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pub fn shrink_to_fit(&mut self)

Shrinks the capacity of the set as much as possible. It will drop down as much as possible while maintaining the internal rules and possibly leaving some space in accordance with the resize policy.

Refer to shrink_to_fit for further details.

§Examples
let mut map = HashSet::with_capacity(5);

map.insert("foo");
map.insert("bar");
map.insert("baz");

assert!(map.capacity() >= 5);

map.shrink_to_fit();

assert_eq!(map.capacity(), 3);
Source

pub fn shrink_to(&mut self, min_capacity: usize)

Shrinks the capacity of the set with a lower limit. It will drop down no lower than the supplied limit while maintaining the internal rules and possibly leaving some space in accordance with the resize policy.

Refer to shrink_to for further details.

Source

pub fn difference<'a>( &'a self, other: &'a HashSet<T, S>, ) -> Difference<'a, T, S>

Visits the values representing the difference, i.e., the values that are in self but not in other.

Refer to difference for further details.

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pub fn symmetric_difference<'a>( &'a self, other: &'a HashSet<T, S>, ) -> SymmetricDifference<'a, T, S>

Visits the values representing the symmetric difference, i.e., the values that are in self or in other but not in both.

Refer to symmetric_difference for further details.

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pub fn intersection<'a>( &'a self, other: &'a HashSet<T, S>, ) -> Intersection<'a, T, S>

Visits the values representing the intersection, i.e., the values that are both in self and other.

Refer to intersection for further details.

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pub fn union<'a>(&'a self, other: &'a HashSet<T, S>) -> Union<'a, T, S>

Visits the values representing the union, i.e., all the values in self or other, without duplicates.

Refer to union for further details.

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pub fn contains<Q>(&self, value: &Q) -> bool
where Q: Hash + Equivalent<T> + ?Sized,

Returns true if the set contains a value.

Refer to contains for further details.

§Examples
let mut map = HashSet::new();

map.insert("foo");

assert!(map.contains("foo"));
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pub fn get<Q>(&self, value: &Q) -> Option<&T>
where Q: Hash + Equivalent<T> + ?Sized,

Returns a reference to the value in the set, if any, that is equal to the given value.

Refer to get for further details.

§Examples
let mut map = HashSet::new();

map.insert("foo");

assert_eq!(map.get("foo"), Some(&"foo"));
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pub fn get_or_insert(&mut self, value: T) -> &T

Inserts the given value into the set if it is not present, then returns a reference to the value in the set.

Refer to get_or_insert for further details.

§Examples
let mut map = HashSet::new();

assert_eq!(map.get_or_insert("foo"), &"foo");
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pub fn get_or_insert_with<Q, F>(&mut self, value: &Q, f: F) -> &T
where Q: Hash + Equivalent<T> + ?Sized, F: FnOnce(&Q) -> T,

Inserts a value computed from f into the set if the given value is not present, then returns a reference to the value in the set.

Refer to get_or_insert_with for further details.

§Examples
let mut map = HashSet::new();

assert_eq!(map.get_or_insert_with(&"foo", |_| "foo"), &"foo");
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pub fn entry(&mut self, value: T) -> Entry<'_, T, S>

Gets the given value’s corresponding entry in the set for in-place manipulation.

Refer to entry for further details.

§Examples
let mut map = HashSet::new();

let value = map.entry("foo").or_insert();
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pub fn is_disjoint(&self, other: &HashSet<T, S>) -> bool

Returns true if self has no elements in common with other. This is equivalent to checking for an empty intersection.

Refer to is_disjoint for further details.

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pub fn is_subset(&self, other: &HashSet<T, S>) -> bool

Returns true if the set is a subset of another, i.e., other contains at least all the values in self.

Refer to is_subset for further details.

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pub fn is_superset(&self, other: &HashSet<T, S>) -> bool

Returns true if the set is a superset of another, i.e., self contains at least all the values in other.

Refer to is_superset for further details.

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pub fn insert(&mut self, value: T) -> bool

Adds a value to the set.

Refer to insert for further details.

§Examples
let mut map = HashSet::new();

map.insert("foo");

assert!(map.contains("foo"));
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pub fn replace(&mut self, value: T) -> Option<T>

Adds a value to the set, replacing the existing value, if any, that is equal to the given one. Returns the replaced value.

Refer to replace for further details.

§Examples
let mut map = HashSet::new();

map.insert("foo");

assert_eq!(map.replace("foo"), Some("foo"));
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pub fn remove<Q>(&mut self, value: &Q) -> bool
where Q: Hash + Equivalent<T> + ?Sized,

Removes a value from the set. Returns whether the value was present in the set.

Refer to remove for further details.

§Examples
let mut map = HashSet::new();

map.insert("foo");

assert!(map.remove("foo"));

assert!(map.is_empty());
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pub fn take<Q>(&mut self, value: &Q) -> Option<T>
where Q: Hash + Equivalent<T> + ?Sized,

Removes and returns the value in the set, if any, that is equal to the given one.

Refer to take for further details.

§Examples
let mut map = HashSet::new();

map.insert("foo");

assert_eq!(map.take("foo"), Some("foo"));

assert!(map.is_empty());
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pub fn allocation_size(&self) -> usize

Returns the total amount of memory allocated internally by the hash set, in bytes.

Refer to allocation_size for further details.

§Examples
let mut map = HashSet::new();

assert_eq!(map.allocation_size(), 0);

map.insert("foo");

assert!(map.allocation_size() >= size_of::<&'static str>());
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pub unsafe fn insert_unique_unchecked(&mut self, value: T) -> &T

Insert a value the set without checking if the value already exists in the set.

Refer to insert_unique_unchecked for further details.

§Safety

This operation is safe if a value does not exist in the set.

However, if a value exists in the set already, the behavior is unspecified: this operation may panic, loop forever, or any following operation with the set may panic, loop forever or return arbitrary result.

That said, this operation (and following operations) are guaranteed to not violate memory safety.

However this operation is still unsafe because the resulting HashSet may be passed to unsafe code which does expect the set to behave correctly, and would cause unsoundness as a result.

Methods from Deref<Target = HashSet<T, S>>§

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pub fn capacity(&self) -> usize

Returns the number of elements the set can hold without reallocating.

§Examples
use hashbrown::HashSet;
let set: HashSet<i32> = HashSet::with_capacity(100);
assert!(set.capacity() >= 100);
Source

pub fn iter(&self) -> Iter<'_, T> ⓘ

An iterator visiting all elements in arbitrary order. The iterator element type is &'a T.

§Examples
use hashbrown::HashSet;
let mut set = HashSet::new();
set.insert("a");
set.insert("b");

// Will print in an arbitrary order.
for x in set.iter() {
    println!("{}", x);
}
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pub fn len(&self) -> usize

Returns the number of elements in the set.

§Examples
use hashbrown::HashSet;

let mut v = HashSet::new();
assert_eq!(v.len(), 0);
v.insert(1);
assert_eq!(v.len(), 1);
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pub fn is_empty(&self) -> bool

Returns true if the set contains no elements.

§Examples
use hashbrown::HashSet;

let mut v = HashSet::new();
assert!(v.is_empty());
v.insert(1);
assert!(!v.is_empty());
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pub fn drain(&mut self) -> Drain<'_, T, A> ⓘ

Clears the set, returning all elements in an iterator.

§Examples
use hashbrown::HashSet;

let mut set: HashSet<_> = [1, 2, 3].into_iter().collect();
assert!(!set.is_empty());

// print 1, 2, 3 in an arbitrary order
for i in set.drain() {
    println!("{}", i);
}

assert!(set.is_empty());
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pub fn retain<F>(&mut self, f: F)
where F: FnMut(&T) -> bool,

Retains only the elements specified by the predicate.

In other words, remove all elements e such that f(&e) returns false.

§Examples
use hashbrown::HashSet;

let xs = [1,2,3,4,5,6];
let mut set: HashSet<i32> = xs.into_iter().collect();
set.retain(|&k| k % 2 == 0);
assert_eq!(set.len(), 3);
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pub fn extract_if<F>(&mut self, f: F) -> ExtractIf<'_, T, F, A> ⓘ
where F: FnMut(&T) -> bool,

Drains elements which are true under the given predicate, and returns an iterator over the removed items.

In other words, move all elements e such that f(&e) returns true out into another iterator.

If the returned ExtractIf is not exhausted, e.g. because it is dropped without iterating or the iteration short-circuits, then the remaining elements will be retained. Use retain() with a negated predicate if you do not need the returned iterator.

§Examples
use hashbrown::HashSet;

let mut set: HashSet<i32> = (0..8).collect();
let drained: HashSet<i32> = set.extract_if(|v| v % 2 == 0).collect();

let mut evens = drained.into_iter().collect::<Vec<_>>();
let mut odds = set.into_iter().collect::<Vec<_>>();
evens.sort();
odds.sort();

assert_eq!(evens, vec![0, 2, 4, 6]);
assert_eq!(odds, vec![1, 3, 5, 7]);
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pub fn clear(&mut self)

Clears the set, removing all values.

§Examples
use hashbrown::HashSet;

let mut v = HashSet::new();
v.insert(1);
v.clear();
assert!(v.is_empty());
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pub fn allocator(&self) -> &A

Returns a reference to the underlying allocator.

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pub fn hasher(&self) -> &S

Returns a reference to the set’s BuildHasher.

§Examples
use hashbrown::HashSet;
use hashbrown::DefaultHashBuilder;

let hasher = DefaultHashBuilder::default();
let set: HashSet<i32> = HashSet::with_hasher(hasher);
let hasher: &DefaultHashBuilder = set.hasher();
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pub fn reserve(&mut self, additional: usize)

Reserves capacity for at least additional more elements to be inserted in the HashSet. The collection may reserve more space to avoid frequent reallocations.

§Panics

Panics if the new capacity exceeds isize::MAX bytes and abort the program in case of allocation error. Use try_reserve instead if you want to handle memory allocation failure.

§Examples
use hashbrown::HashSet;
let mut set: HashSet<i32> = HashSet::new();
set.reserve(10);
assert!(set.capacity() >= 10);
Source

pub fn try_reserve(&mut self, additional: usize) -> Result<(), TryReserveError>

Tries to reserve capacity for at least additional more elements to be inserted in the given HashSet<K,V>. The collection may reserve more space to avoid frequent reallocations.

§Errors

If the capacity overflows, or the allocator reports a failure, then an error is returned.

§Examples
use hashbrown::HashSet;
let mut set: HashSet<i32> = HashSet::new();
set.try_reserve(10).expect("why is the test harness OOMing on 10 bytes?");
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pub fn shrink_to_fit(&mut self)

Shrinks the capacity of the set as much as possible. It will drop down as much as possible while maintaining the internal rules and possibly leaving some space in accordance with the resize policy.

§Examples
use hashbrown::HashSet;

let mut set = HashSet::with_capacity(100);
set.insert(1);
set.insert(2);
assert!(set.capacity() >= 100);
set.shrink_to_fit();
assert!(set.capacity() >= 2);
Source

pub fn shrink_to(&mut self, min_capacity: usize)

Shrinks the capacity of the set with a lower limit. It will drop down no lower than the supplied limit while maintaining the internal rules and possibly leaving some space in accordance with the resize policy.

Panics if the current capacity is smaller than the supplied minimum capacity.

§Examples
use hashbrown::HashSet;

let mut set = HashSet::with_capacity(100);
set.insert(1);
set.insert(2);
assert!(set.capacity() >= 100);
set.shrink_to(10);
assert!(set.capacity() >= 10);
set.shrink_to(0);
assert!(set.capacity() >= 2);
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pub fn difference<'a>( &'a self, other: &'a HashSet<T, S, A>, ) -> Difference<'a, T, S, A>

Visits the values representing the difference, i.e., the values that are in self but not in other.

§Examples
use hashbrown::HashSet;
let a: HashSet<_> = [1, 2, 3].into_iter().collect();
let b: HashSet<_> = [4, 2, 3, 4].into_iter().collect();

// Can be seen as `a - b`.
for x in a.difference(&b) {
    println!("{}", x); // Print 1
}

let diff: HashSet<_> = a.difference(&b).collect();
assert_eq!(diff, [1].iter().collect());

// Note that difference is not symmetric,
// and `b - a` means something else:
let diff: HashSet<_> = b.difference(&a).collect();
assert_eq!(diff, [4].iter().collect());
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pub fn symmetric_difference<'a>( &'a self, other: &'a HashSet<T, S, A>, ) -> SymmetricDifference<'a, T, S, A>

Visits the values representing the symmetric difference, i.e., the values that are in self or in other but not in both.

§Examples
use hashbrown::HashSet;
let a: HashSet<_> = [1, 2, 3].into_iter().collect();
let b: HashSet<_> = [4, 2, 3, 4].into_iter().collect();

// Print 1, 4 in arbitrary order.
for x in a.symmetric_difference(&b) {
    println!("{}", x);
}

let diff1: HashSet<_> = a.symmetric_difference(&b).collect();
let diff2: HashSet<_> = b.symmetric_difference(&a).collect();

assert_eq!(diff1, diff2);
assert_eq!(diff1, [1, 4].iter().collect());
Source

pub fn intersection<'a>( &'a self, other: &'a HashSet<T, S, A>, ) -> Intersection<'a, T, S, A>

Visits the values representing the intersection, i.e., the values that are both in self and other.

§Examples
use hashbrown::HashSet;
let a: HashSet<_> = [1, 2, 3].into_iter().collect();
let b: HashSet<_> = [4, 2, 3, 4].into_iter().collect();

// Print 2, 3 in arbitrary order.
for x in a.intersection(&b) {
    println!("{}", x);
}

let intersection: HashSet<_> = a.intersection(&b).collect();
assert_eq!(intersection, [2, 3].iter().collect());
Source

pub fn union<'a>(&'a self, other: &'a HashSet<T, S, A>) -> Union<'a, T, S, A>

Visits the values representing the union, i.e., all the values in self or other, without duplicates.

§Examples
use hashbrown::HashSet;
let a: HashSet<_> = [1, 2, 3].into_iter().collect();
let b: HashSet<_> = [4, 2, 3, 4].into_iter().collect();

// Print 1, 2, 3, 4 in arbitrary order.
for x in a.union(&b) {
    println!("{}", x);
}

let union: HashSet<_> = a.union(&b).collect();
assert_eq!(union, [1, 2, 3, 4].iter().collect());
Source

pub fn contains<Q>(&self, value: &Q) -> bool
where Q: Hash + Equivalent<T> + ?Sized,

Returns true if the set contains a value.

The value may be any borrowed form of the set’s value type, but Hash and Eq on the borrowed form must match those for the value type.

§Examples
use hashbrown::HashSet;

let set: HashSet<_> = [1, 2, 3].into_iter().collect();
assert_eq!(set.contains(&1), true);
assert_eq!(set.contains(&4), false);
Source

pub fn get<Q>(&self, value: &Q) -> Option<&T>
where Q: Hash + Equivalent<T> + ?Sized,

Returns a reference to the value in the set, if any, that is equal to the given value.

The value may be any borrowed form of the set’s value type, but Hash and Eq on the borrowed form must match those for the value type.

§Examples
use hashbrown::HashSet;

let set: HashSet<_> = [1, 2, 3].into_iter().collect();
assert_eq!(set.get(&2), Some(&2));
assert_eq!(set.get(&4), None);
Source

pub fn get_or_insert(&mut self, value: T) -> &T

Inserts the given value into the set if it is not present, then returns a reference to the value in the set.

§Examples
use hashbrown::HashSet;

let mut set: HashSet<_> = [1, 2, 3].into_iter().collect();
assert_eq!(set.len(), 3);
assert_eq!(set.get_or_insert(2), &2);
assert_eq!(set.get_or_insert(100), &100);
assert_eq!(set.len(), 4); // 100 was inserted
Source

pub fn get_or_insert_with<Q, F>(&mut self, value: &Q, f: F) -> &T
where Q: Hash + Equivalent<T> + ?Sized, F: FnOnce(&Q) -> T,

Inserts a value computed from f into the set if the given value is not present, then returns a reference to the value in the set.

§Examples
use hashbrown::HashSet;

let mut set: HashSet<String> = ["cat", "dog", "horse"]
    .iter().map(|&pet| pet.to_owned()).collect();

assert_eq!(set.len(), 3);
for &pet in &["cat", "dog", "fish"] {
    let value = set.get_or_insert_with(pet, str::to_owned);
    assert_eq!(value, pet);
}
assert_eq!(set.len(), 4); // a new "fish" was inserted

The following example will panic because the new value doesn’t match.

ⓘ
let mut set = hashbrown::HashSet::new();
set.get_or_insert_with("rust", |_| String::new());
Source

pub fn entry(&mut self, value: T) -> Entry<'_, T, S, A>

Gets the given value’s corresponding entry in the set for in-place manipulation.

§Examples
use hashbrown::HashSet;
use hashbrown::hash_set::Entry::*;

let mut singles = HashSet::new();
let mut dupes = HashSet::new();

for ch in "a short treatise on fungi".chars() {
    if let Vacant(dupe_entry) = dupes.entry(ch) {
        // We haven't already seen a duplicate, so
        // check if we've at least seen it once.
        match singles.entry(ch) {
            Vacant(single_entry) => {
                // We found a new character for the first time.
                single_entry.insert();
            }
            Occupied(single_entry) => {
                // We've already seen this once, "move" it to dupes.
                single_entry.remove();
                dupe_entry.insert();
            }
        }
    }
}

assert!(!singles.contains(&'t') && dupes.contains(&'t'));
assert!(singles.contains(&'u') && !dupes.contains(&'u'));
assert!(!singles.contains(&'v') && !dupes.contains(&'v'));
Source

pub fn is_disjoint(&self, other: &HashSet<T, S, A>) -> bool

Returns true if self has no elements in common with other. This is equivalent to checking for an empty intersection.

§Examples
use hashbrown::HashSet;

let a: HashSet<_> = [1, 2, 3].into_iter().collect();
let mut b = HashSet::new();

assert_eq!(a.is_disjoint(&b), true);
b.insert(4);
assert_eq!(a.is_disjoint(&b), true);
b.insert(1);
assert_eq!(a.is_disjoint(&b), false);
Source

pub fn is_subset(&self, other: &HashSet<T, S, A>) -> bool

Returns true if the set is a subset of another, i.e., other contains at least all the values in self.

§Examples
use hashbrown::HashSet;

let sup: HashSet<_> = [1, 2, 3].into_iter().collect();
let mut set = HashSet::new();

assert_eq!(set.is_subset(&sup), true);
set.insert(2);
assert_eq!(set.is_subset(&sup), true);
set.insert(4);
assert_eq!(set.is_subset(&sup), false);
Source

pub fn is_superset(&self, other: &HashSet<T, S, A>) -> bool

Returns true if the set is a superset of another, i.e., self contains at least all the values in other.

§Examples
use hashbrown::HashSet;

let sub: HashSet<_> = [1, 2].into_iter().collect();
let mut set = HashSet::new();

assert_eq!(set.is_superset(&sub), false);

set.insert(0);
set.insert(1);
assert_eq!(set.is_superset(&sub), false);

set.insert(2);
assert_eq!(set.is_superset(&sub), true);
Source

pub fn insert(&mut self, value: T) -> bool

Adds a value to the set.

If the set did not have this value present, true is returned.

If the set did have this value present, false is returned.

§Examples
use hashbrown::HashSet;

let mut set = HashSet::new();

assert_eq!(set.insert(2), true);
assert_eq!(set.insert(2), false);
assert_eq!(set.len(), 1);
Source

pub unsafe fn insert_unique_unchecked(&mut self, value: T) -> &T

Insert a value the set without checking if the value already exists in the set.

This operation is faster than regular insert, because it does not perform lookup before insertion.

This operation is useful during initial population of the set. For example, when constructing a set from another set, we know that values are unique.

§Safety

This operation is safe if a value does not exist in the set.

However, if a value exists in the set already, the behavior is unspecified: this operation may panic, loop forever, or any following operation with the set may panic, loop forever or return arbitrary result.

That said, this operation (and following operations) are guaranteed to not violate memory safety.

However this operation is still unsafe because the resulting HashSet may be passed to unsafe code which does expect the set to behave correctly, and would cause unsoundness as a result.

Source

pub fn replace(&mut self, value: T) -> Option<T>

Adds a value to the set, replacing the existing value, if any, that is equal to the given one. Returns the replaced value.

§Examples
use hashbrown::HashSet;

let mut set = HashSet::new();
set.insert(Vec::<i32>::new());

assert_eq!(set.get(&[][..]).unwrap().capacity(), 0);
set.replace(Vec::with_capacity(10));
assert_eq!(set.get(&[][..]).unwrap().capacity(), 10);
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pub fn remove<Q>(&mut self, value: &Q) -> bool
where Q: Hash + Equivalent<T> + ?Sized,

Removes a value from the set. Returns whether the value was present in the set.

The value may be any borrowed form of the set’s value type, but Hash and Eq on the borrowed form must match those for the value type.

§Examples
use hashbrown::HashSet;

let mut set = HashSet::new();

set.insert(2);
assert_eq!(set.remove(&2), true);
assert_eq!(set.remove(&2), false);
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pub fn take<Q>(&mut self, value: &Q) -> Option<T>
where Q: Hash + Equivalent<T> + ?Sized,

Removes and returns the value in the set, if any, that is equal to the given one.

The value may be any borrowed form of the set’s value type, but Hash and Eq on the borrowed form must match those for the value type.

§Examples
use hashbrown::HashSet;

let mut set: HashSet<_> = [1, 2, 3].into_iter().collect();
assert_eq!(set.take(&2), Some(2));
assert_eq!(set.take(&2), None);
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pub fn allocation_size(&self) -> usize

Returns the total amount of memory allocated internally by the hash set, in bytes.

The returned number is informational only. It is intended to be primarily used for memory profiling.

Trait Implementations§

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impl Default for PreviousVisibleEntities

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fn default() -> PreviousVisibleEntities

Returns the “default value” for a type. Read more
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impl Deref for PreviousVisibleEntities

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type Target = EntityHashSet

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl DerefMut for PreviousVisibleEntities

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.
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impl Resource for PreviousVisibleEntities
where Self: Send + Sync + 'static,

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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where U: ShaderType, &'a T: for<'a> Into<U>,

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fn as_bind_group_shader_type(&self, _images: &RenderAssets<GpuImage>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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impl<T> Downcast<T> for T

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fn downcast(&self) -> &T

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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Converts Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>, which can then be downcast into Box<dyn ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Converts Rc<Trait> (where Trait: Downcast) to Rc<Any>, which can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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Converts &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Converts &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSend for T
where T: Any + Send,

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fn into_any_send(self: Box<T>) -> Box<dyn Any + Send>

Converts Box<Trait> (where Trait: DowncastSend) to Box<dyn Any + Send>, which can then be downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> FromWorld for T
where T: Default,

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fn from_world(_world: &mut World) -> T

Creates Self using default().

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)
The target type on which the method may be called.
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where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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Performs the conversion.
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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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Performs the conversion.
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where V: MultiLane<T>,

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fn vzip(self) -> V

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where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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