Struct bevy::reflect::ReflectFromPtr
[−]pub struct ReflectFromPtr { /* private fields */ }
Expand description
Reflect
values are commonly used in situations where the actual types of values
are not known at runtime. In such situations you might have access to a *const ()
pointer
that you know implements Reflect
, but have no way of turning it into a &dyn Reflect
.
This is where ReflectFromPtr
comes in, when creating a ReflectFromPtr
for a given type T: Reflect
.
Internally, this saves a concrete function *const T -> const dyn Reflect
which lets you create a trait object of Reflect
from a pointer.
Example
use bevy_reflect::{TypeRegistry, Reflect, ReflectFromPtr};
use bevy_ptr::Ptr;
use std::ptr::NonNull;
#[derive(Reflect)]
struct Reflected(String);
let mut type_registry = TypeRegistry::default();
type_registry.register::<Reflected>();
let mut value = Reflected("Hello world!".to_string());
let value = unsafe { Ptr::new(NonNull::from(&mut value).cast()) };
let reflect_data = type_registry.get(std::any::TypeId::of::<Reflected>()).unwrap();
let reflect_from_ptr = reflect_data.data::<ReflectFromPtr>().unwrap();
// SAFE: `value` is of type `Reflected`, which the `ReflectFromPtr` was created for
let value = unsafe { reflect_from_ptr.as_reflect_ptr(value) };
assert_eq!(value.downcast_ref::<Reflected>().unwrap().0, "Hello world!");
Implementations
impl ReflectFromPtr
impl ReflectFromPtr
pub fn type_id(&self) -> TypeId
pub fn type_id(&self) -> TypeId
Returns the TypeId
that the ReflectFromPtr
was constructed for
pub unsafe fn as_reflect_ptr(&self, val: Ptr<'a>) -> &'a (dyn Reflect + 'static)
pub unsafe fn as_reflect_ptr(&self, val: Ptr<'a>) -> &'a (dyn Reflect + 'static)
Safety
val
must be a pointer to value of the type that the ReflectFromPtr
was constructed for.
This can be verified by checking that the type id returned by ReflectFromPtr::type_id
is the expected one.
pub unsafe fn as_reflect_ptr_mut(
&self,
val: PtrMut<'a>
) -> &'a mut (dyn Reflect + 'static)
pub unsafe fn as_reflect_ptr_mut(
&self,
val: PtrMut<'a>
) -> &'a mut (dyn Reflect + 'static)
Safety
val
must be a pointer to a value of the type that the ReflectFromPtr
was constructed for
This can be verified by checking that the type id returned by ReflectFromPtr::type_id
is the expected one.
Trait Implementations
impl Clone for ReflectFromPtr
impl Clone for ReflectFromPtr
fn clone(&self) -> ReflectFromPtr
fn clone(&self) -> ReflectFromPtr
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl<T> FromType<T> for ReflectFromPtr where
T: Reflect,
impl<T> FromType<T> for ReflectFromPtr where
T: Reflect,
fn from_type() -> ReflectFromPtr
Auto Trait Implementations
impl RefUnwindSafe for ReflectFromPtr
impl Send for ReflectFromPtr
impl Sync for ReflectFromPtr
impl Unpin for ReflectFromPtr
impl UnwindSafe for ReflectFromPtr
Blanket Implementations
impl<T, U> AsBindGroupShaderType<U> for T where
U: ShaderType,
&'a T: for<'a> Into<U>,
impl<T, U> AsBindGroupShaderType<U> for T where
U: ShaderType,
&'a T: for<'a> Into<U>,
fn as_bind_group_shader_type(
&self,
_images: &HashMap<Handle<Image>, <Image as RenderAsset>::PreparedAsset, RandomState, Global>
) -> U
fn as_bind_group_shader_type(
&self,
_images: &HashMap<Handle<Image>, <Image as RenderAsset>::PreparedAsset, RandomState, Global>
) -> U
Return the T
ShaderType
for self
. When used in AsBindGroup
derives, it is safe to assume that all images in self
exist. Read more
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<T> Downcast for T where
T: Any,
impl<T> Downcast for T where
T: Any,
fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>
fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>
Convert 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
. Read more
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
. Read more
fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s. Read more
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
sourcefn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
impl<T> TypeData for T where
T: 'static + Send + Sync + Clone,
impl<T> TypeData for T where
T: 'static + Send + Sync + Clone,
fn clone_type_data(&self) -> Box<dyn TypeData + 'static, Global>
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
T: Future, type Output = <T as Future>::Output;
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
sourcefn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
fn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more