Struct objc::declare::ClassDecl

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pub struct ClassDecl { /* private fields */ }
Expand description

A type for declaring a new class and adding new methods and ivars to it before registering it.

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impl ClassDecl

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pub fn new(name: &str, superclass: &Class) -> Option<ClassDecl>

Constructs a ClassDecl with the given name and superclass. Returns None if the class couldn’t be allocated.

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pub fn root( name: &str, intitialize_fn: extern "C" fn(_: &Class, _: Sel) ) -> Option<ClassDecl>

Constructs a ClassDecl declaring a new root class with the given name. Returns None if the class couldn’t be allocated.

An implementation for +initialize must also be given; the runtime calls this method for all classes, so it must be defined on root classes.

Note that implementing a root class is not a simple endeavor. For example, your class probably cannot be passed to Cocoa code unless the entire NSObject protocol is implemented. Functionality it expects, like implementations of -retain and -release used by ARC, will not be present otherwise.

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pub unsafe fn add_method<F>(&mut self, sel: Sel, func: F)where F: MethodImplementation<Callee = Object>,

Adds a method with the given name and implementation to self. Panics if the method wasn’t sucessfully added or if the selector and function take different numbers of arguments. Unsafe because the caller must ensure that the types match those that are expected when the method is invoked from Objective-C.

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pub unsafe fn add_class_method<F>(&mut self, sel: Sel, func: F)where F: MethodImplementation<Callee = Class>,

Adds a class method with the given name and implementation to self. Panics if the method wasn’t sucessfully added or if the selector and function take different numbers of arguments. Unsafe because the caller must ensure that the types match those that are expected when the method is invoked from Objective-C.

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pub fn add_ivar<T>(&mut self, name: &str)where T: Encode,

Adds an ivar with type T and the provided name to self. Panics if the ivar wasn’t successfully added.

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pub fn add_protocol(&mut self, proto: &Protocol)

Adds a protocol to self. Panics if the protocol wasn’t successfully added

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pub fn register(self) -> &'static Class

Registers self, consuming it and returning a reference to the newly registered Class.

Trait Implementations§

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impl Drop for ClassDecl

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fn drop(&mut self)

Executes the destructor for this type. Read more

Auto Trait Implementations§

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere 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 Twhere T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere 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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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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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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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.