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vtable: add safe way to construct references

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This commit is contained in:
Olivier Goffart 2020-05-16 10:14:11 +02:00
parent 810a3905a7
commit aff3d7e14b
6 changed files with 48 additions and 17 deletions
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21
helper_crates/vtable/src/lib.rs
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@ -27,6 +27,7 @@ where
{
/// Savety: must be a valid VTable for Self
const VTABLE: VT::VTable;
const STATIC_VTABLE: &'static VT::VTable;
}
#[derive(Copy, Clone)]
@ -115,6 +116,16 @@ impl<'a, T: ?Sized + VTableMeta> Deref for VRef<'a, T> {
}
impl<'a, T: ?Sized + VTableMeta> VRef<'a, T> {
pub fn new<X: HasStaticVTable<T>>(value: &'a X) -> Self {
Self {
inner: Inner {
vtable: X::STATIC_VTABLE as *const T::VTable as *const u8,
ptr: value as *const X as *const u8,
},
phantom: PhantomData,
}
}
unsafe fn from_inner(inner: Inner) -> Self {
Self { inner, phantom: PhantomData }
}
@ -145,6 +156,16 @@ impl<'a, T: ?Sized + VTableMeta> DerefMut for VRefMut<'a, T> {
}
impl<'a, T: ?Sized + VTableMeta> VRefMut<'a, T> {
pub fn new<X: HasStaticVTable<T>>(value: &'a mut X) -> Self {
Self {
inner: Inner {
vtable: X::STATIC_VTABLE as *const T::VTable as *const u8,
ptr: value as *mut X as *const u8,
},
phantom: PhantomData,
}
}
unsafe fn from_inner(inner: Inner) -> Self {
Self { inner, phantom: PhantomData }
}