//! 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;
#[doc(hidden)]
pub trait CloneToAny {
- /// Clone `self` into a new `Box<CloneAny>` object.
- fn clone_to_any(&self) -> Box<CloneAny>;
+ /// Clone `self` into a new `Box<dyn CloneAny>` object.
+ fn clone_to_any(&self) -> Box<dyn CloneAny>;
- /// Clone `self` into a new `Box<CloneAny + Send>` object.
- fn clone_to_any_send(&self) -> Box<CloneAny + Send> where Self: Send;
+ /// Clone `self` into a new `Box<dyn CloneAny + Send>` object.
+ fn clone_to_any_send(&self) -> Box<dyn CloneAny + Send> where Self: Send;
- /// Clone `self` into a new `Box<CloneAny + Sync>` object.
- fn clone_to_any_sync(&self) -> Box<CloneAny + Sync> where Self: Sync;
+ /// Clone `self` into a new `Box<dyn CloneAny + Sync>` object.
+ fn clone_to_any_sync(&self) -> Box<dyn CloneAny + Sync> where Self: Sync;
- /// Clone `self` into a new `Box<CloneAny + Send + Sync>` object.
- fn clone_to_any_send_sync(&self) -> Box<CloneAny + Send + Sync> where Self: Send + Sync;
+ /// Clone `self` into a new `Box<dyn CloneAny + Send + Sync>` object.
+ fn clone_to_any_send_sync(&self) -> Box<dyn CloneAny + Send + Sync> where Self: Send + Sync;
}
impl<T: Any + Clone> CloneToAny for T {
- fn clone_to_any(&self) -> Box<CloneAny> {
+ #[inline]
+ fn clone_to_any(&self) -> Box<dyn CloneAny> {
Box::new(self.clone())
}
- fn clone_to_any_send(&self) -> Box<CloneAny + Send> where Self: Send {
+ #[inline]
+ fn clone_to_any_send(&self) -> Box<dyn CloneAny + Send> where Self: Send {
Box::new(self.clone())
}
- fn clone_to_any_sync(&self) -> Box<CloneAny + Sync> where Self: Sync {
+ #[inline]
+ fn clone_to_any_sync(&self) -> Box<dyn CloneAny + Sync> where Self: Sync {
Box::new(self.clone())
}
- fn clone_to_any_send_sync(&self) -> Box<CloneAny + Send + Sync> where Self: Send + Sync {
+ #[inline]
+ fn clone_to_any_send_sync(&self) -> Box<dyn CloneAny + Send + Sync> where Self: Send + Sync {
Box::new(self.clone())
}
}
-macro_rules! define {
- (CloneAny) => {
- /// A type to emulate dynamic typing.
- ///
- /// Every type with no non-`'static` references implements `Any`.
- define!(CloneAny remainder);
- };
- (Any) => {
- /// A type to emulate dynamic typing with cloning.
- ///
- /// Every type with no non-`'static` references that implements `Clone` implements `Any`.
- define!(Any remainder);
- };
- ($t:ident remainder) => {
- /// See the [`std::any` documentation](https://doc.rust-lang.org/std/any/index.html) for
- /// more details on `Any` in general.
- ///
- /// This trait is not `std::any::Any` but rather a type extending that for this library’s
- /// purposes so that it can be combined with marker traits like
- /// <code><a class=trait title=core::marker::Send
- /// href=http://doc.rust-lang.org/std/marker/trait.Send.html>Send</a></code> and
- /// <code><a class=trait title=core::marker::Sync
- /// href=http://doc.rust-lang.org/std/marker/trait.Sync.html>Sync</a></code>.
- ///
- define!($t trait);
- };
- (CloneAny trait) => {
- /// See also [`Any`](trait.Any.html) for a version without the `Clone` requirement.
- pub trait CloneAny: Any + CloneToAny { }
- impl<T: StdAny + Clone> CloneAny for T { }
- };
- (Any trait) => {
- /// See also [`CloneAny`](trait.CloneAny.html) for a cloneable version of this trait.
- pub trait Any: StdAny { }
- impl<T: StdAny> Any for T { }
- };
-}
-
macro_rules! impl_clone {
($t:ty, $method:ident) => {
impl Clone for Box<$t> {
+ #[inline]
fn clone(&self) -> Box<$t> {
(**self).$method()
}
}
}
-#[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;
macro_rules! implement {
($base:ident, $(+ $bounds:ident)*) => {
- impl fmt::Debug for $base $(+ $bounds)* {
+ impl fmt::Debug for dyn $base $(+ $bounds)* {
+ #[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- f.pad(stringify!($base $(+ $bounds)*))
+ f.pad(stringify!(dyn $base $(+ $bounds)*))
}
}
- impl UncheckedAnyExt for $base $(+ $bounds)* {
- #[allow(transmute_ptr_to_ref)]
+ impl UncheckedAnyExt for dyn $base $(+ $bounds)* {
+ #[inline]
unsafe fn downcast_ref_unchecked<T: 'static>(&self) -> &T {
- mem::transmute(mem::transmute::<_, TraitObject>(self).data)
+ &*(self as *const Self as *const T)
}
- #[allow(transmute_ptr_to_ref)]
+ #[inline]
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)
}
+ #[inline]
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)
}
}
- impl<T: $base $(+ $bounds)*> IntoBox<$base $(+ $bounds)*> for T {
- fn into_box(self) -> Box<$base $(+ $bounds)*> {
+ impl<T: $base $(+ $bounds)*> IntoBox<dyn $base $(+ $bounds)*> for T {
+ #[inline]
+ fn into_box(self) -> Box<dyn $base $(+ $bounds)*> {
Box::new(self)
}
}
}
}
-define!(Any);
+/// A type to emulate dynamic typing.
+///
+/// Every type with no non-`'static` references implements `Any`.
+/// See the [`std::any` documentation](https://doc.rust-lang.org/std/any/index.html) for
+/// more details on `Any` in general.
+///
+/// This trait is not `std::any::Any` but rather a type extending that for this library’s
+/// purposes so that it can be combined with marker traits like
+/// <code><a class=trait title=core::marker::Send
+/// href=http://doc.rust-lang.org/std/marker/trait.Send.html>Send</a></code> and
+/// <code><a class=trait title=core::marker::Sync
+/// href=http://doc.rust-lang.org/std/marker/trait.Sync.html>Sync</a></code>.
+///
+/// See also [`CloneAny`](trait.CloneAny.html) for a cloneable version of this trait.
+pub trait Any: StdAny { }
+impl<T: StdAny> Any for T { }
implement!(Any,);
implement!(Any, + Send);
implement!(Any, + Sync);
implement!(Any, + Send + Sync);
+
+/// A type to emulate dynamic typing with cloning.
+///
+/// Every type with no non-`'static` references that implements `Clone` implements `Any`.
+/// See the [`std::any` documentation](https://doc.rust-lang.org/std/any/index.html) for
+/// more details on `Any` in general.
+///
+/// This trait is not `std::any::Any` but rather a type extending that for this library’s
+/// purposes so that it can be combined with marker traits like
+/// <code><a class=trait title=core::marker::Send
+/// href=http://doc.rust-lang.org/std/marker/trait.Send.html>Send</a></code> and
+/// <code><a class=trait title=core::marker::Sync
+/// href=http://doc.rust-lang.org/std/marker/trait.Sync.html>Sync</a></code>.
+///
+/// See also [`Any`](trait.Any.html) for a version without the `Clone` requirement.
+pub trait CloneAny: Any + CloneToAny { }
+impl<T: StdAny + Clone> CloneAny for T { }
implement!(CloneAny,);
implement!(CloneAny, + Send);
implement!(CloneAny, + Sync);
implement!(CloneAny, + Send + Sync);
-
-define!(CloneAny);
-impl_clone!(CloneAny, clone_to_any);
-impl_clone!((CloneAny + Send), clone_to_any_send);
-impl_clone!((CloneAny + Sync), clone_to_any_sync);
-impl_clone!((CloneAny + Send + Sync), clone_to_any_send_sync);
+impl_clone!(dyn CloneAny, clone_to_any);
+impl_clone!(dyn CloneAny + Send, clone_to_any_send);
+impl_clone!(dyn CloneAny + Sync, clone_to_any_sync);
+impl_clone!(dyn CloneAny + Send + Sync, clone_to_any_send_sync);