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use crate::traits::{StableVTableTrait, StableReference, VTable, StableMutable, StablePointerCast};
use crate::ptr::StablePtr;
use core::ops::{Deref, DerefMut};
use core::ptr::NonNull;
use core::marker::PhantomData;
#[repr(C)]
pub struct StableRef<'a,Trait: StableVTableTrait + ?Sized>{
data: NonNull<()>,
vtable: NonNull<VTable>,
phantom: PhantomData<&'a Trait>
}
unsafe impl<'a,Trait: StableVTableTrait + ?Sized> StableReference<'a,Trait> for StableRef<'a,Trait>{
type Pointer = StablePtr<Trait>;
fn size_of_val(&self) -> usize where Trait: 'a {
unsafe{self.vtable.as_ref().size}
}
fn align_of_val(&self) -> usize where Trait: 'a {
unsafe{self.vtable.as_ref().align}
}
fn into_raw(self) -> Self::Pointer {
unsafe{core::mem::transmute(self)}
}
}
impl<Trait: StableVTableTrait + StablePointerCast<StablePtr<Trait>> + ?Sized> Deref for StableRef<'_,Trait>{
type Target = Trait;
fn deref(&self) -> &Self::Target {
<Trait as StablePointerCast<StablePtr<Trait>>>::borrow_stable_ref(self)
}
}
impl<'a,'b: 'a,Trait: StableVTableTrait + ?Sized> From<StableMut<'b,Trait>> for StableRef<'a,Trait>{
fn from(v: StableMut<'b, Trait>) -> Self {
unsafe{core::mem::transmute(v)}
}
}
#[repr(C)]
pub struct StableMut<'a,Trait: StableVTableTrait + ?Sized>{
data: NonNull<()>,
vtable: NonNull<VTable>,
phantom: PhantomData<&'a Trait>
}
unsafe impl<'a,Trait: StableVTableTrait + ?Sized> StableReference<'a,Trait> for StableMut<'a,Trait>{
type Pointer = StablePtr<Trait>;
fn size_of_val(&self) -> usize where Trait: 'a {
unsafe{self.vtable.as_ref().size}
}
fn align_of_val(&self) -> usize where Trait: 'a {
unsafe{self.vtable.as_ref().align}
}
fn into_raw(self) -> Self::Pointer {
unsafe{core::mem::transmute(self)}
}
}
unsafe impl<'a,Trait: StableVTableTrait + ?Sized> StableMutable<'a,Trait> for StableMut<'a,Trait>{}
impl<Trait: StableVTableTrait + StablePointerCast<StablePtr<Trait>> + ?Sized> Deref for StableMut<'_,Trait>{
type Target = Trait;
fn deref(&self) -> &Self::Target {
<Trait as StablePointerCast<StablePtr<Trait>>>::borrow_stable_ref(unsafe{core::mem::transmute(self)})
}
}
impl<Trait: StableVTableTrait + StablePointerCast<StablePtr<Trait>> + ?Sized> DerefMut for StableMut<'_,Trait>{
fn deref_mut(&mut self) -> &mut Self::Target {
<Trait as StablePointerCast<StablePtr<Trait>>>::borrow_stable_mut(self)
}
}