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Add the #[pin] attribute to be able to project to the pinned item

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This commit is contained in:
Olivier Goffart 2020-06-25 12:17:32 +02:00
parent 9ed660926c
commit f50a705e00
9 changed files with 32 additions and 16 deletions
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14
helper_crates/vtable/src/lib.rs
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@ -54,7 +54,7 @@ that `cbindgen` can see the actual vtable.
*/
pub use const_field_offset::FieldOffset;
pub use const_field_offset::*;
use core::marker::PhantomData;
use core::ops::{Deref, DerefMut, Drop};
use core::{pin::Pin, ptr::NonNull};
@ -429,15 +429,15 @@ macro_rules! new_vref {
/// Represent an offset to a field of type mathcing the vtable, within the Base container structure.
#[repr(C)]
pub struct VOffset<Base, T: ?Sized + VTableMeta> {
pub struct VOffset<Base, T: ?Sized + VTableMeta, PinFlag = NotPinnedFlag> {
vtable: &'static T::VTable,
/// Safety invariant: the vtable is valid, and the field at the given offset within Base is
/// matching with the vtable
offset: usize,
phantom: PhantomData<*const Base>,
phantom: PhantomData<FieldOffset<Base, (), PinFlag>>,
}
impl<Base, T: ?Sized + VTableMeta> VOffset<Base, T> {
impl<Base, T: ?Sized + VTableMeta, Flag> VOffset<Base, T, Flag> {
#[inline]
pub fn apply<'a>(self, x: &'a Base) -> VRef<'a, T> {
let ptr = x as *const Base as *const u8;
@ -460,7 +460,7 @@ impl<Base, T: ?Sized + VTableMeta> VOffset<Base, T> {
}
}
pub fn new<X: HasStaticVTable<T>>(o: FieldOffset<Base, X>) -> Self {
pub fn new<X: HasStaticVTable<T>>(o: FieldOffset<Base, X, Flag>) -> Self {
Self { vtable: X::static_vtable(), offset: o.get_byte_offset(), phantom: PhantomData }
}
@ -473,9 +473,9 @@ impl<Base, T: ?Sized + VTableMeta> VOffset<Base, T> {
}
// Need to implement manually otheriwse it is not implemented if T do not implement Copy / Clone
impl<Base, T: ?Sized + VTableMeta> Copy for VOffset<Base, T> {}
impl<Base, T: ?Sized + VTableMeta, Flag> Copy for VOffset<Base, T, Flag> {}
impl<Base, T: ?Sized + VTableMeta> Clone for VOffset<Base, T> {
impl<Base, T: ?Sized + VTableMeta, Flag> Clone for VOffset<Base, T, Flag> {
fn clone(&self) -> Self {
Self { vtable: self.vtable, offset: self.offset, phantom: PhantomData }
}