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Implement Reflect trait with a variant on the standard OIBIT

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semantics that tests the *interface* of trait objects, rather
than what they close over.
This commit is contained in:
Niko Matsakis
2015-03-24 15:55:29 -04:00
parent a923278c62
commit 9c9bb9ce1d
13 changed files with 252 additions and 29 deletions
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6
src/liballoc/boxed.rs
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@@ -244,13 +244,13 @@ pub trait BoxAny {
/// Returns the boxed value if it is of type `T`, or
/// `Err(Self)` if it isn't.
#[stable(feature = "rust1", since = "1.0.0")]
fn downcast<T: 'static>(self) -> Result<Box<T>, Box<Any>>;
fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any>>;
}
#[stable(feature = "rust1", since = "1.0.0")]
impl BoxAny for Box<Any> {
#[inline]
fn downcast<T: 'static>(self) -> Result<Box<T>, Box<Any>> {
fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any>> {
if self.is::<T>() {
unsafe {
// Get the raw representation of the trait object
@@ -270,7 +270,7 @@ impl BoxAny for Box<Any> {
#[stable(feature = "rust1", since = "1.0.0")]
impl BoxAny for Box<Any+Send> {
#[inline]
fn downcast<T: 'static>(self) -> Result<Box<T>, Box<Any>> {
fn downcast<T: Any>(self) -> Result<Box<T>, Box<Any>> {
<Box<Any>>::downcast(self)
}
}