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Add VBox::new

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This commit is contained in:
Olivier Goffart 2020-05-16 09:04:16 +02:00
parent b745c616f7
commit 810a3905a7
3 changed files with 17 additions and 47 deletions
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8
helper_crates/vtable/src/lib.rs
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@ -11,19 +11,19 @@ pub unsafe trait VTableMeta {
type Target;
/// That's the VTable itself (so most likely Self)
type VTable;
type VTable: 'static;
}
pub trait VTableMetaDrop: VTableMeta {
/// Safety: the Target need to be pointing to a valid allocated pointer
unsafe fn drop(ptr: *mut Self::Target);
fn new_box<X: HasStaticVTable<Self>>(value: X) -> VBox<Self>;
}
/// Allow to associate a VTable to a type.
pub unsafe trait HasStaticVTable<VT>
where
VT: ?Sized + VTableMeta,
VT::VTable: 'static,
{
/// Savety: must be a valid VTable for Self
const VTABLE: VT::VTable;
@ -75,6 +75,10 @@ impl<T: ?Sized + VTableMetaDrop> Drop for VBox<T> {
}
impl<T: ?Sized + VTableMetaDrop> VBox<T> {
pub fn new<X: HasStaticVTable<T>>(value: X) -> Self {
T::new_box(value)
}
pub unsafe fn from_raw(vtable: NonNull<T::VTable>, ptr: NonNull<u8>) -> Self {
Self {
inner: Inner { vtable: vtable.cast().as_ptr(), ptr: ptr.cast().as_ptr() },