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 = Ptr::from(&value);

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(value) };

assert_eq!(value.downcast_ref::<Reflected>().unwrap().0, "Hello world!");

Implementations§

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impl ReflectFromPtr

pub fn type_id(&self) -> TypeId

Returns the TypeId that the ReflectFromPtr was constructed for.

pub unsafe fn as_reflect<'a>(&self, val: Ptr<'a>) -> &'a (dyn Reflect + 'static)

Convert Ptr into &dyn Reflect.

§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_mut<'a>( &self, val: PtrMut<'a>, ) -> &'a mut (dyn Reflect + 'static)

Convert PtrMut into &mut dyn Reflect.

§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.

pub fn from_ptr(&self) -> unsafe fn(_: Ptr<'_>) -> &(dyn Reflect + 'static)

Get a function pointer to turn a Ptr into &dyn Reflect for the type this ReflectFromPtr was constructed for.

§Safety

When calling the unsafe function returned by this method you must ensure that:

  • The input Ptr points to the Reflect type this ReflectFromPtr was constructed for.

pub fn from_ptr_mut( &self, ) -> unsafe fn(_: PtrMut<'_>) -> &mut (dyn Reflect + 'static)

Get a function pointer to turn a PtrMut into &mut dyn Reflect for the type this ReflectFromPtr was constructed for.

§Safety

When calling the unsafe function returned by this method you must ensure that:

  • The input PtrMut points to the Reflect type this ReflectFromPtr was constructed for.

Trait Implementations§

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impl Clone for ReflectFromPtr

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fn clone(&self) -> ReflectFromPtr

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T> FromType<T> for ReflectFromPtr
where T: Reflect,

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T, U> AsBindGroupShaderType<U> for T
where U: ShaderType, &'a T: for<'a> Into<U>,

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fn as_bind_group_shader_type(&self, _images: &RenderAssets<GpuImage>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Downcast<T> for T

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fn downcast(&self) -> &T

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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

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.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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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.
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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.
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impl<T> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Sync + Send>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<S> FromSample<S> for S

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fn from_sample_(s: S) -> S

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_sample(self) -> T

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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fn to_sample_(self) -> U

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impl<T, U> TryFrom<U> for T
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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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type Error = <U as TryFrom<T>>::Error

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