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core: Add Clone trait

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This commit is contained in:
Brian Anderson 2012-11-26 16:12:47 -08:00
parent 1c348e6e38
commit b21e9d52de
7 changed files with 64 additions and 26 deletions
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20
src/libstd/arc.rs
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@ -103,6 +103,12 @@ fn unwrap<T: Const Send>(rc: ARC<T>) -> T {
unsafe { unwrap_shared_mutable_state(move x) }
}
impl<T: Const Send> ARC<T>: Clone {
fn clone(&self) -> ARC<T> {
clone(self)
}
}
/****************************************************************************
* Mutex protected ARC (unsafe)
****************************************************************************/
@ -128,13 +134,16 @@ pub fn mutex_arc_with_condvars<T: Send>(user_data: T,
MutexARC { x: unsafe { shared_mutable_state(move data) } }
}
impl<T: Send> &MutexARC<T> {
impl<T: Send> MutexARC<T>: Clone {
/// Duplicate a mutex-protected ARC, as arc::clone.
fn clone() -> MutexARC<T> {
fn clone(&self) -> MutexARC<T> {
// NB: Cloning the underlying mutex is not necessary. Its reference
// count would be exactly the same as the shared state's.
MutexARC { x: unsafe { clone_shared_mutable_state(&self.x) } }
}
}
impl<T: Send> &MutexARC<T> {
/**
* Access the underlying mutable data with mutual exclusion from other
@ -265,13 +274,16 @@ pub fn rw_arc_with_condvars<T: Const Send>(user_data: T,
RWARC { x: unsafe { shared_mutable_state(move data) }, cant_nest: () }
}
impl<T: Const Send> &RWARC<T> {
impl<T: Const Send> RWARC<T> {
/// Duplicate a rwlock-protected ARC, as arc::clone.
fn clone() -> RWARC<T> {
fn clone(&self) -> RWARC<T> {
RWARC { x: unsafe { clone_shared_mutable_state(&self.x) },
cant_nest: () }
}
}
impl<T: Const Send> &RWARC<T> {
/**
* Access the underlying data mutably. Locks the rwlock in write mode;
* other readers and writers will block.