Struct NSCountedSet 

pub struct NSCountedSet<ObjectType: ?Sized = AnyObject> { /* private fields */ }

Available on crate feature NSSet only.

************** Counted Set ***************

See also Apple’s documentation

Implementations

impl<ObjectType: ?Sized + Message> NSCountedSet<ObjectType>

pub unsafe fn cast_unchecked<NewObjectType: ?Sized + Message>( &self, ) -> &NSCountedSet<NewObjectType>

Unchecked conversion of the generic parameter.

Safety

The generic must be valid to reinterpret as the given type.

impl<ObjectType: Message> NSCountedSet<ObjectType>

pub fn initWithCapacity( this: Allocated<Self>, num_items: NSUInteger, ) -> Retained<Self>

pub fn initWithArray( this: Allocated<Self>, array: &NSArray<ObjectType>, ) -> Retained<Self>

Available on crate feature NSArray only.

pub fn initWithSet( this: Allocated<Self>, set: &NSSet<ObjectType>, ) -> Retained<Self>

pub fn countForObject(&self, object: &ObjectType) -> NSUInteger

pub unsafe fn objectEnumerator(&self) -> Retained<NSEnumerator<ObjectType>>

Available on crate feature NSEnumerator only.

Safety

The returned enumerator’s underlying collection should not be mutated while in use.

pub fn addObject(&self, object: &ObjectType)

pub fn removeObject(&self, object: &ObjectType)

impl<ObjectType: Message> NSCountedSet<ObjectType>

Methods declared on superclass NSMutableSet.

pub unsafe fn initWithCoder( this: Allocated<Self>, coder: &NSCoder, ) -> Option<Retained<Self>>

Available on crate feature NSCoder only.

Safety

coder possibly has further requirements.

pub fn init(this: Allocated<Self>) -> Retained<Self>

impl<ObjectType: Message> NSCountedSet<ObjectType>

Methods declared on superclass NSSet.

pub unsafe fn initWithObjects_count( this: Allocated<Self>, objects: *mut NonNull<ObjectType>, cnt: NSUInteger, ) -> Retained<Self>

Safety

objects must be a valid pointer or null.

impl<ObjectType: Message> NSCountedSet<ObjectType>

Methods declared on superclass NSObject.

pub fn new() -> Retained<Self>

Methods from Deref<Target = NSMutableSet<ObjectType>>

pub fn filterUsingPredicate(&self, predicate: &NSPredicate)

Available on crate feature NSPredicate only.

pub unsafe fn cast_unchecked<NewObjectType: ?Sized + Message>( &self, ) -> &NSMutableSet<NewObjectType>

Unchecked conversion of the generic parameter.

Safety

The generic must be valid to reinterpret as the given type.

pub fn addObject(&self, object: &ObjectType)

pub fn removeObject(&self, object: &ObjectType)

pub fn addObjectsFromArray(&self, array: &NSArray<ObjectType>)

Available on crate feature NSArray only.

pub fn intersectSet(&self, other_set: &NSSet<ObjectType>)

pub fn minusSet(&self, other_set: &NSSet<ObjectType>)

pub fn removeAllObjects(&self)

pub fn unionSet(&self, other_set: &NSSet<ObjectType>)

pub fn setSet(&self, other_set: &NSSet<ObjectType>)

Methods from Deref<Target = NSSet<ObjectType>>

pub fn valueForKey(&self, key: &NSString) -> Retained<AnyObject>

Available on crate features NSKeyValueCoding and NSString only.

pub unsafe fn setValue_forKey(&self, value: Option<&AnyObject>, key: &NSString)

Available on crate features NSKeyValueCoding and NSString only.

Safety

value should be of the correct type.

pub unsafe fn addObserver_forKeyPath_options_context( &self, observer: &NSObject, key_path: &NSString, options: NSKeyValueObservingOptions, context: *mut c_void, )

Available on crate features NSKeyValueObserving and NSString only.

Safety

• observer should be of the correct type.
• context must be a valid pointer or null.

pub unsafe fn removeObserver_forKeyPath_context( &self, observer: &NSObject, key_path: &NSString, context: *mut c_void, )

Available on crate features NSKeyValueObserving and NSString only.

Safety

• observer should be of the correct type.
• context must be a valid pointer or null.

pub unsafe fn removeObserver_forKeyPath( &self, observer: &NSObject, key_path: &NSString, )

Available on crate features NSKeyValueObserving and NSString only.

Safety

observer should be of the correct type.

pub fn filteredSetUsingPredicate( &self, predicate: &NSPredicate, ) -> Retained<NSSet<ObjectType>>

Available on crate feature NSPredicate only.

pub unsafe fn cast_unchecked<NewObjectType: ?Sized + Message>( &self, ) -> &NSSet<NewObjectType>

Unchecked conversion of the generic parameter.

Safety

The generic must be valid to reinterpret as the given type.

pub fn count(&self) -> NSUInteger

pub fn member(&self, object: &ObjectType) -> Option<Retained<ObjectType>>

pub unsafe fn objectEnumerator(&self) -> Retained<NSEnumerator<ObjectType>>

Available on crate feature NSEnumerator only.

Safety

The returned enumerator’s underlying collection should not be mutated while in use.

pub fn allObjects(&self) -> Retained<NSArray<ObjectType>>

Available on crate feature NSArray only.

pub fn anyObject(&self) -> Option<Retained<ObjectType>>

pub fn containsObject(&self, an_object: &ObjectType) -> bool

pub fn description(&self) -> Retained<NSString>

Available on crate feature NSString only.

pub unsafe fn descriptionWithLocale( &self, locale: Option<&AnyObject>, ) -> Retained<NSString>

Available on crate feature NSString only.

Safety

locale should be of the correct type.

pub fn intersectsSet(&self, other_set: &NSSet<ObjectType>) -> bool

pub fn isEqualToSet(&self, other_set: &NSSet<ObjectType>) -> bool

pub fn isSubsetOfSet(&self, other_set: &NSSet<ObjectType>) -> bool

pub unsafe fn makeObjectsPerformSelector(&self, a_selector: Sel)

Safety

a_selector must be a valid selector.

pub unsafe fn makeObjectsPerformSelector_withObject( &self, a_selector: Sel, argument: Option<&AnyObject>, )

Safety

• a_selector must be a valid selector.
• argument should be of the correct type.

pub fn setByAddingObject( &self, an_object: &ObjectType, ) -> Retained<NSSet<ObjectType>>

pub fn setByAddingObjectsFromSet( &self, other: &NSSet<ObjectType>, ) -> Retained<NSSet<ObjectType>>

pub fn setByAddingObjectsFromArray( &self, other: &NSArray<ObjectType>, ) -> Retained<NSSet<ObjectType>>

Available on crate feature NSArray only.

pub fn enumerateObjectsUsingBlock( &self, block: &DynBlock<dyn Fn(NonNull<ObjectType>, NonNull<Bool>) + '_>, )

Available on crate feature block2 only.

pub fn enumerateObjectsWithOptions_usingBlock( &self, opts: NSEnumerationOptions, block: &DynBlock<dyn Fn(NonNull<ObjectType>, NonNull<Bool>) + '_>, )

Available on crate features NSObjCRuntime and block2 only.

pub fn objectsPassingTest( &self, predicate: &DynBlock<dyn Fn(NonNull<ObjectType>, NonNull<Bool>) -> Bool + '_>, ) -> Retained<NSSet<ObjectType>>

Available on crate feature block2 only.

pub fn objectsWithOptions_passingTest( &self, opts: NSEnumerationOptions, predicate: &DynBlock<dyn Fn(NonNull<ObjectType>, NonNull<Bool>) -> Bool + '_>, ) -> Retained<NSSet<ObjectType>>

Available on crate features NSObjCRuntime and block2 only.

pub fn sortedArrayUsingDescriptors( &self, sort_descriptors: &NSArray<NSSortDescriptor>, ) -> Retained<NSArray<ObjectType>>

Available on crate features NSSortDescriptor and NSArray only.

pub unsafe fn anyObject_unchecked(&self) -> Option<&ObjectType>

A direct reference to an arbitrary object in the set.

Consider using the anyObject method instead, unless you’re seeing performance issues from the retaining.

Safety

The set must not be mutated while the reference is live.

pub unsafe fn member_unchecked( &self, object: &ObjectType, ) -> Option<&ObjectType>

A direct reference the member that matches the given object.

Consider using the member method instead, unless you’re seeing performance issues from the retaining.

Safety

The set must not be mutated while the returned reference is live.

pub unsafe fn iter_unchecked(&self) -> IterUnchecked<'_, ObjectType>

Available on crate feature NSEnumerator only.

Iterate over the set in an arbitrary order without retaining the elements.

Consider using the iter method instead, unless you’re seeing performance issues from the retaining.

Safety

The set must not be mutated for the lifetime of the iterator, or the elements it returns.

pub fn len(&self) -> usize

Returns the number of elements in the set.

Examples

use objc2_foundation::{ns_string, NSSet};

let strs = [ns_string!("one"), ns_string!("two"), ns_string!("three")];
let set = NSSet::from_slice(&strs);
assert_eq!(set.len(), 3);

pub fn is_empty(&self) -> bool

Returns true if the set contains no elements.

Examples

use objc2_foundation::{NSSet, NSObject};

let set = NSSet::<NSObject>::new();
assert!(set.is_empty());

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

Available on crate feature NSEnumerator only.

An iterator visiting all elements in arbitrary order.

Examples

use objc2_foundation::{ns_string, NSSet};

let set = NSSet::from_slice(&[ns_string!("one"), ns_string!("two"), ns_string!("three")]);
for s in set.iter() {
    println!("{s}");
}

pub fn to_vec(&self) -> Vec<Retained<ObjectType>>

Available on crate feature NSEnumerator only.

Returns a Vec containing the set’s elements in arbitrary order.

Examples

use objc2_foundation::{NSSet, NSString};

let strs = [
    NSString::from_str("one"),
    NSString::from_str("two"),
    NSString::from_str("three"),
];
let set = NSSet::from_retained_slice(&strs);
let vec = set.to_vec();
assert_eq!(vec.len(), 3);

Methods from Deref<Target = NSObject>

pub fn doesNotRecognizeSelector(&self, sel: Sel) -> !

Handle messages the object doesn’t recognize.

See Apple’s documentation for details.

Methods from Deref<Target = AnyObject>

pub fn class(&self) -> &'static AnyClass

Dynamically find the class of this object.

Panics

May panic if the object is invalid (which may be the case for objects returned from unavailable init/new methods).

Example

Check that an instance of NSObject has the precise class NSObject.

use objc2::ClassType;
use objc2::runtime::NSObject;

let obj = NSObject::new();
assert_eq!(obj.class(), NSObject::class());

pub unsafe fn get_ivar<T>(&self, name: &str) -> &T

where T: Encode,

👎Deprecated: this is difficult to use correctly, use Ivar::load instead.

Use Ivar::load instead.

Safety

The object must have an instance variable with the given name, and it must be of type T.

See Ivar::load_ptr for details surrounding this.

pub fn downcast_ref<T>(&self) -> Option<&T>

where T: DowncastTarget,

Attempt to downcast the object to a class of type T.

This is the reference-variant. Use Retained::downcast if you want to convert a retained object to another type.

Mutable classes

Some classes have immutable and mutable variants, such as NSString and NSMutableString.

When some Objective-C API signature says it gives you an immutable class, it generally expects you to not mutate that, even though it may technically be mutable “under the hood”.

So using this method to convert a NSString to a NSMutableString, while not unsound, is generally frowned upon unless you created the string yourself, or the API explicitly documents the string to be mutable.

See Apple’s documentation on mutability and on isKindOfClass: for more details.

Generic classes

Objective-C generics are called “lightweight generics”, and that’s because they aren’t exposed in the runtime. This makes it impossible to safely downcast to generic collections, so this is disallowed by this method.

You can, however, safely downcast to generic collections where all the type-parameters are AnyObject.

Panics

This works internally by calling isKindOfClass:. That means that the object must have the instance method of that name, and an exception will be thrown (if CoreFoundation is linked) or the process will abort if that is not the case. In the vast majority of cases, you don’t need to worry about this, since both root objects NSObject and NSProxy implement this method.

Examples

Cast an NSString back and forth from NSObject.

use objc2::rc::Retained;
use objc2_foundation::{NSObject, NSString};

let obj: Retained<NSObject> = NSString::new().into_super();
let string = obj.downcast_ref::<NSString>().unwrap();
// Or with `downcast`, if we do not need the object afterwards
let string = obj.downcast::<NSString>().unwrap();

Try (and fail) to cast an NSObject to an NSString.

use objc2_foundation::{NSObject, NSString};

let obj = NSObject::new();
assert!(obj.downcast_ref::<NSString>().is_none());

Try to cast to an array of strings.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);
// This is invalid and doesn't type check.
let arr = arr.downcast_ref::<NSArray<NSString>>();

This fails to compile, since it would require enumerating over the array to ensure that each element is of the desired type, which is a performance pitfall.

Downcast when processing each element instead.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);

for elem in arr {
    if let Some(data) = elem.downcast_ref::<NSString>() {
        // handle `data`
    }
}

Trait Implementations

impl<ObjectType: ?Sized + Message> AsRef<AnyObject> for NSCountedSet<ObjectType>

fn as_ref(&self) -> &AnyObject

Converts this type into a shared reference of the (usually inferred) input type.

impl<ObjectType: ?Sized + Message> AsRef<NSCountedSet<ObjectType>> for NSCountedSet<ObjectType>

fn as_ref(&self) -> &Self

Converts this type into a shared reference of the (usually inferred) input type.

impl<ObjectType: ?Sized + Message> AsRef<NSMutableSet<ObjectType>> for NSCountedSet<ObjectType>

fn as_ref(&self) -> &NSMutableSet<ObjectType>

Converts this type into a shared reference of the (usually inferred) input type.

impl<ObjectType: ?Sized + Message> AsRef<NSObject> for NSCountedSet<ObjectType>

fn as_ref(&self) -> &NSObject

Converts this type into a shared reference of the (usually inferred) input type.

impl<ObjectType: ?Sized + Message> AsRef<NSSet<ObjectType>> for NSCountedSet<ObjectType>

fn as_ref(&self) -> &NSSet<ObjectType>

Converts this type into a shared reference of the (usually inferred) input type.

impl<ObjectType: ?Sized + Message> Borrow<AnyObject> for NSCountedSet<ObjectType>

fn borrow(&self) -> &AnyObject

Immutably borrows from an owned value.

impl<ObjectType: ?Sized + Message> Borrow<NSMutableSet<ObjectType>> for NSCountedSet<ObjectType>

fn borrow(&self) -> &NSMutableSet<ObjectType>

Immutably borrows from an owned value.

impl<ObjectType: ?Sized + Message> Borrow<NSObject> for NSCountedSet<ObjectType>

fn borrow(&self) -> &NSObject

Immutably borrows from an owned value.

impl<ObjectType: ?Sized + Message> Borrow<NSSet<ObjectType>> for NSCountedSet<ObjectType>

fn borrow(&self) -> &NSSet<ObjectType>

Immutably borrows from an owned value.

impl<ObjectType: ?Sized + Message> ClassType for NSCountedSet<ObjectType>

const NAME: &'static str = "NSCountedSet"

The name of the Objective-C class that this type represents.

type Super = NSMutableSet<ObjectType>

The superclass of this class.

type ThreadKind = <<NSCountedSet<ObjectType> as ClassType>::Super as ClassType>::ThreadKind

Whether the type can be used from any thread, or from only the main thread.

fn class() -> &'static AnyClass

Get a reference to the Objective-C class that this type represents.

fn as_super(&self) -> &Self::Super

Get an immutable reference to the superclass.

impl<ObjectType: Debug + Message> Debug for NSCountedSet<ObjectType>

Available on crate feature NSEnumerator only.

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

Formats the value using the given formatter.

impl<ObjectType: Message> DefaultRetained for NSCountedSet<ObjectType>

fn default_retained() -> Retained<Self>

The default Retained for a type.

impl<ObjectType: ?Sized + Message> Deref for NSCountedSet<ObjectType>

type Target = NSMutableSet<ObjectType>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<ObjectType: ?Sized> Hash for NSCountedSet<ObjectType>

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<ObjectType: ?Sized + Message> Message for NSCountedSet<ObjectType>

fn retain(&self) -> Retained<Self>

where Self: Sized,

Increment the reference count of the receiver.

impl<ObjectType: ?Sized + NSCoding> NSCoding for NSCountedSet<ObjectType>

unsafe fn encodeWithCoder(&self, coder: &NSCoder)

where Self: Sized + Message,

Available on crate features NSObject and NSCoder only.

Safety

unsafe fn initWithCoder( this: Allocated<Self>, coder: &NSCoder, ) -> Option<Retained<Self>>

where Self: Sized + Message,

Available on crate features NSObject and NSCoder only.

Safety

impl<ObjectType: ?Sized> NSFastEnumeration for NSCountedSet<ObjectType>

unsafe fn countByEnumeratingWithState_objects_count( &self, state: NonNull<NSFastEnumerationState>, buffer: NonNull<*mut AnyObject>, len: NSUInteger, ) -> NSUInteger

where Self: Sized + Message,

Available on crate feature NSEnumerator only.

Safety

impl<ObjectType: ?Sized> NSObjectProtocol for NSCountedSet<ObjectType>

fn isEqual(&self, other: Option<&AnyObject>) -> bool

where Self: Sized + Message,

Check whether the object is equal to an arbitrary other object.

fn hash(&self) -> usize

where Self: Sized + Message,

An integer that can be used as a table address in a hash table structure.

fn isKindOfClass(&self, cls: &AnyClass) -> bool

where Self: Sized + Message,

Check if the object is an instance of the class, or one of its subclasses.

fn is_kind_of<T>(&self) -> bool

where T: ClassType, Self: Sized + Message,

👎Deprecated: use isKindOfClass directly, or cast your objects with AnyObject::downcast_ref

Check if the object is an instance of the class type, or one of its subclasses.

fn isMemberOfClass(&self, cls: &AnyClass) -> bool

where Self: Sized + Message,

Check if the object is an instance of a specific class, without checking subclasses.

fn respondsToSelector(&self, aSelector: Sel) -> bool

where Self: Sized + Message,

Check whether the object implements or inherits a method with the given selector.

fn conformsToProtocol(&self, aProtocol: &AnyProtocol) -> bool

where Self: Sized + Message,

Check whether the object conforms to a given protocol.

fn description(&self) -> Retained<NSObject>

where Self: Sized + Message,

A textual representation of the object.

fn debugDescription(&self) -> Retained<NSObject>

where Self: Sized + Message,

A textual representation of the object to use when debugging.

fn isProxy(&self) -> bool

where Self: Sized + Message,

Check whether the receiver is a subclass of the NSProxy root class instead of the usual NSObject.

fn retainCount(&self) -> usize

where Self: Sized + Message,

The reference count of the object.

impl<ObjectType: ?Sized + NSSecureCoding> NSSecureCoding for NSCountedSet<ObjectType>

fn supportsSecureCoding() -> bool

where Self: Sized + ClassType,

Available on crate feature NSObject only.

impl<ObjectType: ?Sized> PartialEq for NSCountedSet<ObjectType>

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<ObjectType: ?Sized + Message> RefEncode for NSCountedSet<ObjectType>

const ENCODING_REF: Encoding = <NSMutableSet<ObjectType> as ::objc2::RefEncode>::ENCODING_REF

The Objective-C type-encoding for a reference of this type.

impl DowncastTarget for NSCountedSet<AnyObject>

impl<ObjectType: ?Sized> Eq for NSCountedSet<ObjectType>