Struct Object

Source

#[repr(C)]
pub struct Object { /* private fields */ }

Expand description

A type that represents an instance of a class.

Implementations§

Source §

impl Object

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pub fn class(&self) -> &Class

Returns the class of self.

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

Returns a reference to the ivar of self with the given name. Panics if self has no ivar with the given name. Unsafe because the caller must ensure that the ivar is actually of type T.

Examples found in repository ?

examples/example.rs (line 29)

8fn main() {
9    // Get a class
10    let cls = class!(NSObject);
11    println!("NSObject size: {}", cls.instance_size());
12
13    // Inspect its ivars
14    println!("NSObject ivars:");
15    for ivar in cls.instance_variables().iter() {
16        println!("{}", ivar.name());
17    }
18
19    // Allocate an instance
20    let obj = unsafe {
21        let obj: *mut Object = msg_send![cls, alloc];
22        let obj: *mut Object = msg_send![obj, init];
23        StrongPtr::new(obj)
24    };
25    println!("NSObject address: {:p}", obj);
26
27    // Access an ivar of the object
28    let isa: *const Class = unsafe {
29        *(**obj).get_ivar("isa")
30    };
31    println!("NSObject isa: {:?}", isa);
32
33    // Inspect a method of the class
34    let hash_sel = sel!(hash);
35    let hash_method = cls.instance_method(hash_sel).unwrap();
36    let hash_return = hash_method.return_type();
37    println!("-[NSObject hash] return type: {:?}", hash_return);
38    assert!(hash_return == usize::encode());
39
40    // Invoke a method on the object
41    let hash: usize = unsafe {
42        msg_send![*obj, hash]
43    };
44    println!("NSObject hash: {}", hash);
45}

Source

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

Returns a mutable reference to the ivar of self with the given name. Panics if self has no ivar with the given name. Unsafe because the caller must ensure that the ivar is actually of type T.

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

Sets the value of the ivar of self with the given name. Panics if self has no ivar with the given name. Unsafe because the caller must ensure that the ivar is actually of type T.