Trait AnyZonbi

Source

pub trait AnyZonbi<'life>: Sealed + 'life {
    // Required methods
    fn zonbi_id(&self) -> ZonbiId;
    unsafe fn get_raw(&self) -> *const ();
    unsafe fn get_raw_mut(&mut self) -> *mut ();
}

Expand description

The trait implemented by Cage to blur its generic Zonbi.

Required Methods§

Source

fn zonbi_id(&self) -> ZonbiId

Returns the ZonbiId of this erased type.

This needs a shared reference to self in order to be object-safe. If you have a concrete type without an instance of it, use Zonbi::zonbi_id instead.

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unsafe fn get_raw(&self) -> *const ()

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unsafe fn get_raw_mut(&mut self) -> *mut ()

Implementations§

Source §

impl<'life> dyn AnyZonbi<'life>

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pub fn represents<Z: Zonbi<'life>>(&self) -> bool

Returns true if the inner type represents the same as T, excluding its lifetimes.

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pub fn downcast_ref<Z: Zonbi<'life>>(&self) -> Option<&Z::Casted>

Returns a shared reference to the inner value with a lifetime of 'life if it represents the zonbi Z, or None if it doesn’t.

Examples found in repository ?

examples/type_map.rs (line 27)

19fn with_zonbi<'a>(a: &'a NonCopyI32) {
20    let my_struct = MyStruct { val: a };
21
22    let mut type_map: HashMap<ZonbiId, Box<dyn AnyZonbi<'a>>> = HashMap::new();
23    let id = ZonbiId::of::<MyStruct>();
24
25    type_map.insert(id, Box::new(Cage::new(my_struct)));
26
27    let r: &MyStruct<'a> = type_map[&id].downcast_ref::<MyStruct<'a>>().unwrap();
28    assert_eq!(r.val, &NonCopyI32(42));
29    println!("{:?}", r.val);
30}