Struct winit::platform_impl::linux::common::xkb::XkbContext
source · pub struct XkbContext {
context: NonNull<xkb_context>,
}
Fields§
§context: NonNull<xkb_context>
Implementations§
Methods from Deref<Target = NonNull<xkb_context>>§
1.25.0 · sourcepub unsafe fn as_ref<'a>(&self) -> &'a T
pub unsafe fn as_ref<'a>(&self) -> &'a T
Returns a shared reference to the value. If the value may be uninitialized, as_uninit_ref
must be used instead.
For the mutable counterpart see as_mut
.
§Safety
When calling this method, you have to ensure that all of the following is true:
-
The pointer must be properly aligned.
-
It must be “dereferenceable” in the sense defined in the module documentation.
-
The pointer must point to an initialized instance of
T
. -
You must enforce Rust’s aliasing rules, since the returned lifetime
'a
is arbitrarily chosen and does not necessarily reflect the actual lifetime of the data. In particular, while this reference exists, the memory the pointer points to must not get mutated (except insideUnsafeCell
).
This applies even if the result of this method is unused! (The part about being initialized is not yet fully decided, but until it is, the only safe approach is to ensure that they are indeed initialized.)
§Examples
use std::ptr::NonNull;
let mut x = 0u32;
let ptr = NonNull::new(&mut x as *mut _).expect("ptr is null!");
let ref_x = unsafe { ptr.as_ref() };
println!("{ref_x}");
Trait Implementations§
source§impl Debug for XkbContext
impl Debug for XkbContext
source§impl Deref for XkbContext
impl Deref for XkbContext
Auto Trait Implementations§
impl Freeze for XkbContext
impl RefUnwindSafe for XkbContext
impl !Send for XkbContext
impl !Sync for XkbContext
impl Unpin for XkbContext
impl UnwindSafe for XkbContext
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T> Downcast for Twhere
T: Any,
impl<T> Downcast for Twhere
T: Any,
source§fn into_any(self: Box<T>) -> Box<dyn Any>
fn into_any(self: Box<T>) -> Box<dyn Any>
Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
.source§fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
.source§fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
&Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s.source§fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
&mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s.