Struct NSNull 

#[repr(C)]
pub struct NSNull(/* private fields */);

A singleton object used to represent null values in collection objects that don’t allow nil values.

See documentation.

Implementations

impl NSNull

pub fn null() -> &'static Self

Returns the singleton instance.

See documentation.

Methods from Deref<Target = NSObject<'static>>

pub fn retain_count(&self) -> usize

Returns this object’s reference count.

This method is only useful for debugging certain objects.

See documentation.

pub fn responds_to_selector(&self, selector: Sel) -> bool

Returns true if this object implements or inherits a method that can respond to a specified message.

See documentation.

pub fn is_kind_of_class(&self, class: &Class) -> bool

Returns true if this object is an instance or subclass of class.

See documentation

pub fn is_member_of_class(&self, class: &Class) -> bool

Returns true if this object is an instance of class.

See documentation

pub fn hash(&self) -> NSUInteger

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

See documentation.

pub fn copy(&self) -> Arc<Self>

Returns a copy of this object using NSCopying.

See documentation.

pub fn mutable_copy(&self) -> Arc<Self>

Returns a copy of this object using NSMutableCopying.

See documentation.

pub fn description(&self) -> Arc<NSString<'static>>

Returns a string that describes the contents of this object.

See documentation

pub fn debug_description(&self) -> Arc<NSString<'static>>

Returns a string that describes the contents of the receiver for presentation in the debugger.

See documentation

Trait Implementations

impl AsMut<NSNull> for NSNull

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

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

impl<T> AsMut<T> for NSNull

where NSObject<'static>: AsMut<T>,

fn as_mut(&mut self) -> &mut T

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

impl AsRef<NSNull> for NSNull

fn as_ref(&self) -> &Self

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

impl<T> AsRef<T> for NSNull

where NSObject<'static>: AsRef<T>,

fn as_ref(&self) -> &T

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

impl ClassType<'static> for NSNull

fn class() -> &'static Class

Returns the Objective-C class that can be used to instantiate a new instance of Self.

impl Default for &NSNull

fn default() -> Self

Returns the “default value” for a type.

impl Deref for NSNull

type Target = NSObject<'static>

The resulting type after dereferencing.

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

Dereferences the value.

impl ObjectType<'static> for NSNull

fn as_objc_object(&self) -> &ObjCObject<'data>

Casts self into a type-erased Objective-C object.

fn class<'s>(&'s self) -> &'s Class

where 'data: 's,

Returns the class that this object is an instance of.

impl ObjectType for NSNull

fn retain(obj: &Self) -> Arc<Self>

Increments the object’s retain count and returns a smart pointer that automatically calls release on Drop.

unsafe fn release(obj: NonNull<Self>)

Decrements the object’s retain count.