Struct vtable::VRefMut

#[repr(transparent)]
pub struct VRefMut<'a, T: ?Sized + VTableMeta> { /* private fields */ }

VRefMut<'a MyTraitVTable> can be thought as a &'a mut dyn MyTrait

It will dereference to a structure that has the same members as MyTrait.

Implementations

impl<'a, T: ?Sized + VTableMeta> VRefMut<'a, T>

pub fn new<X: HasStaticVTable<T>>(value: &'a mut X) -> Self

Create a new VRef from a mutable reference of a type that can be associated with a VTable.

(the HasStaticVTable is implemented by the “MyTrait”VTable_static! macro generated by the #vtable macro)

pub unsafe fn from_raw(vtable: NonNull<T::VTable>, ptr: NonNull<u8>) -> Self

Create a new VRefMut from raw pointers

Safety

The ptr needs to be a valid object fitting the vtable. Both vtable and ptr lifetime must outlive ’a. Can create mutable reference to ptr, so no other code can create mutable reference of ptr during the life time ’a.

pub fn borrow(&self) -> VRef<'_, T>

Borrow this to obtain a VRef.

pub fn borrow_mut(&mut self) -> VRefMut<'_, T>

Borrow this to obtain a new VRefMut.

pub fn into_ref(self) -> VRef<'a, T>

Create a VRef with the same lifetime as the original lifetime.

pub fn downcast<X: HasStaticVTable<T>>(&mut self) -> Option<&mut X>

Return a reference of the given type if the type is matching.

Trait Implementations

impl<'a, T: ?Sized + VTableMeta> Deref for VRefMut<'a, T>

type Target = <T as VTableMeta>::Target

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'a, T: ?Sized + VTableMeta> DerefMut for VRefMut<'a, T>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.