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<'a>(
&self,
val: Ptr<'a>
) -> &'a (dyn Reflect + 'static)
pub unsafe fn as_reflect_ptr<'a>(
&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<'a>(
&self,
val: PtrMut<'a>
) -> &'a mut (dyn Reflect + 'static)
pub unsafe fn as_reflect_ptr_mut<'a>(
&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
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read more§impl<T> FromType<T> for ReflectFromPtrwhere
T: Reflect,
impl<T> FromType<T> for ReflectFromPtrwhere
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 Twhere
U: ShaderType,
&'a T: for<'a> Into<U>,
impl<T, U> AsBindGroupShaderType<U> for Twhere
U: ShaderType,
&'a T: for<'a> Into<U>,
§fn as_bind_group_shader_type(&self, _images: &RenderAssets<Image>) -> U
fn as_bind_group_shader_type(&self, _images: &RenderAssets<Image>) -> U
T
ShaderType
for self
. When used in AsBindGroup
derives, it is safe to assume that all images in self
exist. Read more§impl<T> Downcast for Twhere
T: Any,
impl<T> Downcast for Twhere
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>
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>
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)
&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)
&mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more