//! This stuff is all based on `std::any`, but goes a little further, with `CloneAny` being a
//! cloneable `Any` and with the `Send` and `Sync` bounds possible on both `Any` and `CloneAny`.
-use std::mem;
use std::fmt;
use std::any::Any as StdAny;
}
}
-#[cfg(feature = "unstable")]
-use std::raw::TraitObject;
-
-#[cfg(not(feature = "unstable"))]
-#[repr(C)]
-#[derive(Copy, Clone)]
-struct TraitObject {
- pub data: *mut (),
- pub vtable: *mut (),
-}
-
#[allow(missing_docs)] // Bogus warning (it’s not public outside the crate), ☹
pub trait UncheckedAnyExt: Any {
unsafe fn downcast_ref_unchecked<T: Any>(&self) -> &T;
impl UncheckedAnyExt for $base $(+ $bounds)* {
unsafe fn downcast_ref_unchecked<T: 'static>(&self) -> &T {
- mem::transmute(mem::transmute::<_, TraitObject>(self).data)
+ &*(self as *const Self as *const T)
}
unsafe fn downcast_mut_unchecked<T: 'static>(&mut self) -> &mut T {
- mem::transmute(mem::transmute::<_, TraitObject>(self).data)
+ &mut *(self as *mut Self as *mut T)
}
unsafe fn downcast_unchecked<T: 'static>(self: Box<Self>) -> Box<T> {
- mem::transmute(mem::transmute::<_, TraitObject>(self).data)
+ Box::from_raw(Box::into_raw(self) as *mut T)
}
}