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Require allocator to be static for boxed Pin-API

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This commit is contained in:
Tim Diekmann 2020-11-28 15:24:30 +01:00
parent a1a13b2bc4
commit 7387f48e50
1 changed files with 25 additions and 7 deletions
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32
library/alloc/src/boxed.rs
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@ -327,7 +327,10 @@ impl<T, A: AllocRef> Box<T, A> {
/// `x` will be pinned in memory and unable to be moved.
#[unstable(feature = "allocator_api", issue = "32838")]
#[inline(always)]
pub fn pin_in(x: T, alloc: A) -> Pin<Self> {
pub fn pin_in(x: T, alloc: A) -> Pin<Self>
where
A: 'static,
{
Self::new_in(x, alloc).into()
}
@ -802,7 +805,10 @@ impl<T: ?Sized, A: AllocRef> Box<T, A> {
///
/// This is also available via [`From`].
#[unstable(feature = "box_into_pin", issue = "62370")]
pub fn into_pin(boxed: Self) -> Pin<Self> {
pub fn into_pin(boxed: Self) -> Pin<Self>
where
A: 'static,
{
// It's not possible to move or replace the insides of a `Pin<Box<T>>`
// when `T: !Unpin`, so it's safe to pin it directly without any
// additional requirements.
@ -1010,7 +1016,10 @@ impl<T> From<T> for Box<T> {
}
#[stable(feature = "pin", since = "1.33.0")]
impl<T: ?Sized, A: AllocRef> From<Box<T, A>> for Pin<Box<T, A>> {
impl<T: ?Sized, A: AllocRef> From<Box<T, A>> for Pin<Box<T, A>>
where
A: 'static,
{
/// Converts a `Box<T>` into a `Pin<Box<T>>`
///
/// This conversion does not allocate on the heap and happens in place.
@ -1413,10 +1422,13 @@ impl<T: ?Sized, A: AllocRef> AsMut<T> for Box<T, A> {
* could have a method to project a Pin<T> from it.
*/
#[stable(feature = "pin", since = "1.33.0")]
impl<T: ?Sized, A: AllocRef> Unpin for Box<T, A> {}
impl<T: ?Sized, A: AllocRef> Unpin for Box<T, A> where A: 'static {}
#[unstable(feature = "generator_trait", issue = "43122")]
impl<G: ?Sized + Generator<R> + Unpin, R, A: AllocRef> Generator<R> for Box<G, A> {
impl<G: ?Sized + Generator<R> + Unpin, R, A: AllocRef> Generator<R> for Box<G, A>
where
A: 'static,
{
type Yield = G::Yield;
type Return = G::Return;
@ -1426,7 +1438,10 @@ impl<G: ?Sized + Generator<R> + Unpin, R, A: AllocRef> Generator<R> for Box<G, A
}
#[unstable(feature = "generator_trait", issue = "43122")]
impl<G: ?Sized + Generator<R>, R, A: AllocRef> Generator<R> for Pin<Box<G, A>> {
impl<G: ?Sized + Generator<R>, R, A: AllocRef> Generator<R> for Pin<Box<G, A>>
where
A: 'static,
{
type Yield = G::Yield;
type Return = G::Return;
@ -1436,7 +1451,10 @@ impl<G: ?Sized + Generator<R>, R, A: AllocRef> Generator<R> for Pin<Box<G, A>> {
}
#[stable(feature = "futures_api", since = "1.36.0")]
impl<F: ?Sized + Future + Unpin, A: AllocRef> Future for Box<F, A> {
impl<F: ?Sized + Future + Unpin, A: AllocRef> Future for Box<F, A>
where
A: 'static,
{
type Output = F::Output;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {