Rename RefKind -> Memory

Also change Memory type-tags to enums (non-inhabitable types, no need for derive)

Author: Bromeon

bindings_generator/src/special_methods.rs

@@ -52,7 +52,7 @@ pub fn generate_godot_object_impl(class: &GodotClass) -> TokenStream {
         impl gdnative_core::private::godot_object::Sealed for #class_name {}
 
         unsafe impl GodotObject for #class_name {
-            type RefKind = #memory;
+            type Memory = #memory;
 
             #[inline]
             fn class_name() -> &'static str {

examples/dodge_the_creeps/src/main_scene.rs

@@ -140,7 +140,7 @@ impl Main {
 ///   scene as the root. For instance Spatial is used for this example.
 fn instance_scene<Root>(scene: &Ref<PackedScene, Shared>) -> Ref<Root, Unique>
 where
-    Root: gdnative::object::GodotObject<RefKind = ManuallyManaged> + SubClass<Node>,
+    Root: gdnative::object::GodotObject<Memory = ManuallyManaged> + SubClass<Node>,
 {
     let scene = unsafe { scene.assume_safe() };
 

examples/native_plugin/src/lib.rs

@@ -58,7 +58,7 @@ impl MyButton {
 
 unsafe fn load<T>(path: &str, hint: &str) -> Option<Ref<T, Shared>>
 where
-    T: GodotObject<RefKind = RefCounted> + SubClass<Resource>,
+    T: GodotObject<Memory = RefCounted> + SubClass<Resource>,
 {
     let resource = ResourceLoader::godot_singleton().load(path, hint, false)?;
     let resource = resource.assume_safe().claim();

examples/scene_create/src/lib.rs

@@ -116,7 +116,7 @@ pub fn load_scene(path: &str) -> Option<Ref<PackedScene, ThreadLocal>> {
 ///   scene as the root. For instance Spatial is used for this example.
 fn instance_scene<Root>(scene: &PackedScene) -> Result<Ref<Root, Unique>, ManageErrs>
 where
-    Root: gdnative::object::GodotObject<RefKind = ManuallyManaged> + SubClass<Node>,
+    Root: gdnative::object::GodotObject<Memory = ManuallyManaged> + SubClass<Node>,
 {
     let instance = scene
         .instance(PackedScene::GEN_EDIT_STATE_DISABLED)

gdnative-core/src/object/bounds.rs

@@ -8,51 +8,51 @@ use crate::object::ownership::*;
 use crate::object::*;
 
 // ----------------------------------------------------------------------------------------------------------------------------------------------
-// Implementation for RefKind policy
+// Implementation for Memory policy
 
-/// Specialization trait depending on [`RefKind`]. This is an internal interface.
-pub trait RefKindSpec: Sized {
+/// Specialization trait depending on [`Memory`]. This is an internal interface.
+pub trait MemorySpec: Sized {
     /// Pointer wrapper that may be `Drop` or not.
     #[doc(hidden)]
     type PtrWrapper: PtrWrapper;
 
     #[doc(hidden)]
-    unsafe fn impl_from_maybe_ref_counted<T: GodotObject<RefKind = Self>>(
+    unsafe fn impl_from_maybe_ref_counted<T: GodotObject<Memory = Self>>(
         ptr: NonNull<sys::godot_object>,
     ) -> Option<Ref<T, Unique>>
     where
-        Self: RefKind;
+        Self: Memory;
 
     #[doc(hidden)]
-    unsafe fn impl_assume_safe<'a, T: GodotObject<RefKind = Self>>(
+    unsafe fn impl_assume_safe<'a, T: GodotObject<Memory = Self>>(
         this: &Ref<T, Shared>,
     ) -> TRef<'a, T, Shared>
     where
-        Self: RefKind;
+        Self: Memory;
 
     #[doc(hidden)]
-    unsafe fn impl_assume_unique<T: GodotObject<RefKind = Self>>(
+    unsafe fn impl_assume_unique<T: GodotObject<Memory = Self>>(
         this: Ref<T, Shared>,
     ) -> Ref<T, Unique>
     where
-        Self: RefKind;
+        Self: Memory;
 
     #[doc(hidden)]
-    unsafe fn maybe_add_ref<T: GodotObject<RefKind = Self>>(raw: &RawObject<T>)
+    unsafe fn maybe_add_ref<T: GodotObject<Memory = Self>>(raw: &RawObject<T>)
     where
-        Self: RefKind;
+        Self: Memory;
 
     #[doc(hidden)]
-    unsafe fn maybe_init_ref<T: GodotObject<RefKind = Self>>(raw: &RawObject<T>)
+    unsafe fn maybe_init_ref<T: GodotObject<Memory = Self>>(raw: &RawObject<T>)
     where
-        Self: RefKind;
+        Self: Memory;
 }
 
-impl RefKindSpec for ManuallyManaged {
+impl MemorySpec for ManuallyManaged {
     type PtrWrapper = Forget;
 
     #[inline(always)]
-    unsafe fn impl_from_maybe_ref_counted<T: GodotObject<RefKind = Self>>(
+    unsafe fn impl_from_maybe_ref_counted<T: GodotObject<Memory = Self>>(
         ptr: NonNull<sys::godot_object>,
     ) -> Option<Ref<T, Unique>> {
         if RawObject::<ReferenceCountedClassPlaceholder>::try_from_sys_ref(ptr).is_some() {
@@ -71,7 +71,7 @@ impl RefKindSpec for ManuallyManaged {
     }
 
     #[inline(always)]
-    unsafe fn impl_assume_safe<'a, T: GodotObject<RefKind = Self>>(
+    unsafe fn impl_assume_safe<'a, T: GodotObject<Memory = Self>>(
         this: &Ref<T, Shared>,
     ) -> TRef<'a, T, Shared> {
         debug_assert!(
@@ -82,7 +82,7 @@ impl RefKindSpec for ManuallyManaged {
     }
 
     #[inline(always)]
-    unsafe fn impl_assume_unique<T: GodotObject<RefKind = Self>>(
+    unsafe fn impl_assume_unique<T: GodotObject<Memory = Self>>(
         this: Ref<T, Shared>,
     ) -> Ref<T, Unique> {
         debug_assert!(
@@ -93,16 +93,16 @@ impl RefKindSpec for ManuallyManaged {
     }
 
     #[inline]
-    unsafe fn maybe_add_ref<T: GodotObject<RefKind = Self>>(_raw: &RawObject<T>) {}
+    unsafe fn maybe_add_ref<T: GodotObject<Memory = Self>>(_raw: &RawObject<T>) {}
     #[inline]
-    unsafe fn maybe_init_ref<T: GodotObject<RefKind = Self>>(_raw: &RawObject<T>) {}
+    unsafe fn maybe_init_ref<T: GodotObject<Memory = Self>>(_raw: &RawObject<T>) {}
 }
 
-impl RefKindSpec for RefCounted {
+impl MemorySpec for RefCounted {
     type PtrWrapper = UnRef;
 
     #[inline(always)]
-    unsafe fn impl_from_maybe_ref_counted<T: GodotObject<RefKind = Self>>(
+    unsafe fn impl_from_maybe_ref_counted<T: GodotObject<Memory = Self>>(
         ptr: NonNull<sys::godot_object>,
     ) -> Option<Ref<T, Unique>> {
         if RawObject::<ReferenceCountedClassPlaceholder>::try_from_sys_ref(ptr).is_some() {
@@ -120,26 +120,26 @@ impl RefKindSpec for RefCounted {
     }
 
     #[inline(always)]
-    unsafe fn impl_assume_safe<'a, T: GodotObject<RefKind = Self>>(
+    unsafe fn impl_assume_safe<'a, T: GodotObject<Memory = Self>>(
         this: &Ref<T, Shared>,
     ) -> TRef<'a, T, Shared> {
         this.assume_safe_unchecked()
     }
 
     #[inline(always)]
-    unsafe fn impl_assume_unique<T: GodotObject<RefKind = Self>>(
+    unsafe fn impl_assume_unique<T: GodotObject<Memory = Self>>(
         this: Ref<T, Shared>,
     ) -> Ref<T, Unique> {
         this.cast_access()
     }
 
     #[inline]
-    unsafe fn maybe_add_ref<T: GodotObject<RefKind = Self>>(raw: &RawObject<T>) {
+    unsafe fn maybe_add_ref<T: GodotObject<Memory = Self>>(raw: &RawObject<T>) {
         raw.add_ref();
     }
 
     #[inline]
-    unsafe fn maybe_init_ref<T: GodotObject<RefKind = Self>>(raw: &RawObject<T>) {
+    unsafe fn maybe_init_ref<T: GodotObject<Memory = Self>>(raw: &RawObject<T>) {
         raw.init_ref_count();
     }
 }
@@ -201,9 +201,9 @@ impl Drop for UnRef {
 
 /// Trait for constraining `assume_safe` lifetimes to the one of `&self` when `T` is
 /// reference-counted. This is an internal interface.
-pub trait LifetimeConstraint<Kind: RefKind> {}
+pub trait LifetimeConstraint<Kind: Memory> {}
 
-/// Type used to check lifetime constraint depending on `RefKind`. Internal interface.
+/// Type used to check lifetime constraint depending on `Memory`. Internal interface.
 #[doc(hidden)]
 pub struct AssumeSafeLifetime<'a, 'r> {
     _marker: PhantomData<(&'a (), &'r ())>,
@@ -215,19 +215,19 @@ impl<'a, 'r: 'a> LifetimeConstraint<RefCounted> for AssumeSafeLifetime<'a, 'r> {
 // ----------------------------------------------------------------------------------------------------------------------------------------------
 // SafeDeref, SafeAsRaw
 
-/// Trait for combinations of `RefKind` and `ThreadAccess` that can be dereferenced safely.
+/// Trait for combinations of `Memory` and `Ownership` that can be dereferenced safely.
 /// This is an internal interface.
-pub unsafe trait SafeDeref<Kind: RefKind, Own: Ownership> {
+pub unsafe trait SafeDeref<Kind: Memory, Own: Ownership> {
     /// Returns a safe reference to the underlying object.
     #[doc(hidden)]
-    fn impl_as_ref<T: GodotObject<RefKind = Kind>>(this: &Ref<T, Own>) -> TRef<'_, T, Own>;
+    fn impl_as_ref<T: GodotObject<Memory = Kind>>(this: &Ref<T, Own>) -> TRef<'_, T, Own>;
 }
 
 /// Trait for persistent `Ref`s that point to valid objects. This is an internal interface.
-pub unsafe trait SafeAsRaw<Kind: RefKind, Own: Ownership> {
+pub unsafe trait SafeAsRaw<Kind: Memory, Own: Ownership> {
     /// Returns a raw reference to the underlying object.
     #[doc(hidden)]
-    fn impl_as_raw<T: GodotObject<RefKind = Kind>>(this: &Ref<T, Own>) -> &RawObject<T>;
+    fn impl_as_raw<T: GodotObject<Memory = Kind>>(this: &Ref<T, Own>) -> &RawObject<T>;
 }
 
 // ----------------------------------------------------------------------------------------------------------------------------------------------
@@ -240,7 +240,7 @@ pub struct RefImplBound {
 
 unsafe impl SafeDeref<ManuallyManaged, Unique> for RefImplBound {
     #[inline]
-    fn impl_as_ref<T: GodotObject<RefKind = ManuallyManaged>>(
+    fn impl_as_ref<T: GodotObject<Memory = ManuallyManaged>>(
         this: &Ref<T, Unique>,
     ) -> TRef<'_, T, Unique> {
         unsafe { this.assume_safe_unchecked() }
@@ -249,14 +249,14 @@ unsafe impl SafeDeref<ManuallyManaged, Unique> for RefImplBound {
 
 unsafe impl<Own: LocalThreadOwnership> SafeDeref<RefCounted, Own> for RefImplBound {
     #[inline]
-    fn impl_as_ref<T: GodotObject<RefKind = RefCounted>>(this: &Ref<T, Own>) -> TRef<'_, T, Own> {
+    fn impl_as_ref<T: GodotObject<Memory = RefCounted>>(this: &Ref<T, Own>) -> TRef<'_, T, Own> {
         unsafe { this.assume_safe_unchecked() }
     }
 }
 
 unsafe impl SafeAsRaw<ManuallyManaged, Unique> for RefImplBound {
     #[inline]
-    fn impl_as_raw<T: GodotObject<RefKind = ManuallyManaged>>(
+    fn impl_as_raw<T: GodotObject<Memory = ManuallyManaged>>(
         this: &Ref<T, Unique>,
     ) -> &RawObject<T> {
         unsafe { this.as_raw_unchecked() }
@@ -265,7 +265,7 @@ unsafe impl SafeAsRaw<ManuallyManaged, Unique> for RefImplBound {
 
 unsafe impl<Own: Ownership> SafeAsRaw<RefCounted, Own> for RefImplBound {
     #[inline]
-    fn impl_as_raw<T: GodotObject<RefKind = RefCounted>>(this: &Ref<T, Own>) -> &RawObject<T> {
+    fn impl_as_raw<T: GodotObject<Memory = RefCounted>>(this: &Ref<T, Own>) -> &RawObject<T> {
         unsafe { this.as_raw_unchecked() }
     }
 }

gdnative-core/src/object/instance.rs

@@ -233,7 +233,7 @@ impl<T: NativeClass, Own: Ownership> Instance<T, Own> {
 
 impl<T: NativeClass, Own: Ownership> Instance<T, Own>
 where
-    RefImplBound: SafeAsRaw<<T::Base as GodotObject>::RefKind, Own>,
+    RefImplBound: SafeAsRaw<<T::Base as GodotObject>::Memory, Own>,
 {
     /// Try to downcast `Ref<T::Base, Own>` to `Instance<T>`, without changing the reference
     /// count if reference-counted.
@@ -263,7 +263,7 @@ where
 
 impl<T: NativeClass, Own: Ownership> Instance<T, Own>
 where
-    RefImplBound: SafeDeref<<T::Base as GodotObject>::RefKind, Own>,
+    RefImplBound: SafeDeref<<T::Base as GodotObject>::Memory, Own>,
 {
     /// Calls a function with a NativeClass instance and its owner, and returns its return
     /// value. Can be used on reference counted types for multiple times.
@@ -314,7 +314,7 @@ impl<T: NativeClass> Instance<T, Shared> {
     #[inline]
     pub unsafe fn assume_safe<'a, 'r>(&'r self) -> TInstance<'a, T, Shared>
     where
-        AssumeSafeLifetime<'a, 'r>: LifetimeConstraint<<T::Base as GodotObject>::RefKind>,
+        AssumeSafeLifetime<'a, 'r>: LifetimeConstraint<<T::Base as GodotObject>::Memory>,
     {
         TInstance {
             owner: self.owner.assume_safe(),
@@ -325,7 +325,7 @@ impl<T: NativeClass> Instance<T, Shared> {
 
 impl<T: NativeClass> Instance<T, Shared>
 where
-    T::Base: GodotObject<RefKind = ManuallyManaged>,
+    T::Base: GodotObject<Memory = ManuallyManaged>,
 {
     /// Returns `true` if the pointer currently points to a valid object of the correct type.
     /// **This does NOT guarantee that it's safe to use this pointer.**
@@ -342,7 +342,7 @@ where
 
 impl<T: NativeClass> Instance<T, Unique>
 where
-    T::Base: GodotObject<RefKind = ManuallyManaged>,
+    T::Base: GodotObject<Memory = ManuallyManaged>,
 {
     /// Frees the base object and user-data wrapper.
     ///
@@ -355,7 +355,7 @@ where
 
 impl<T: NativeClass> Instance<T, Unique>
 where
-    T::Base: GodotObject<RefKind = ManuallyManaged> + QueueFree,
+    T::Base: GodotObject<Memory = ManuallyManaged> + QueueFree,
 {
     /// Queues the base object and user-data wrapper for deallocation in the near future.
     /// This should be preferred to `free` for `Node`s.
@@ -380,7 +380,7 @@ impl<T: NativeClass> Instance<T, Unique> {
 
 impl<T: NativeClass> Instance<T, Unique>
 where
-    T::Base: GodotObject<RefKind = RefCounted>,
+    T::Base: GodotObject<Memory = RefCounted>,
 {
     /// Coverts into a `ThreadLocal` instance.
     #[inline]
@@ -414,7 +414,7 @@ impl<T: NativeClass> Instance<T, Shared> {
 
 impl<T: NativeClass> Instance<T, Shared>
 where
-    T::Base: GodotObject<RefKind = RefCounted>,
+    T::Base: GodotObject<Memory = RefCounted>,
 {
     /// Assume that all references to the underlying object is local to the current thread.
     ///
@@ -570,7 +570,7 @@ where
 impl<T> FromVariant for Instance<T, Shared>
 where
     T: NativeClass,
-    T::Base: GodotObject<RefKind = RefCounted>,
+    T::Base: GodotObject<Memory = RefCounted>,
 {
     #[inline]
     fn from_variant(variant: &Variant) -> Result<Self, FromVariantError> {

gdnative-core/src/object/memory.rs

@@ -1,25 +1,29 @@
 //! Marker types to express the memory management method of Godot types.
+// Note: markers are enums to prevent instantiation and avoid derive (empty/non-inhabitable types)
 
-use crate::object::bounds::RefKindSpec;
+use crate::object::bounds::MemorySpec;
 
 /// Marker that indicates that a type is manually managed.
-#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default)]
-pub struct ManuallyManaged;
+pub enum ManuallyManaged {}
 
 /// Marker that indicates that a type is reference-counted.
-#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default)]
-pub struct RefCounted;
+pub enum RefCounted {}
 
 /// Trait to parameterize over the memory management markers [`ManuallyManaged`] and [`RefCounted`].
 ///
 /// This trait is sealed and has no public members.
-pub trait RefKind: RefKindSpec + private::Sealed {}
+///
+/// It defines how memory is managed for Godot objects in smart pointers, for example [`Ref`][super::Ref].
+/// Generally, classes inheriting `Reference` are ref-counted, while the rest (i.e. everything inheriting
+/// `Object` which is not a `Reference`) is manually managed.
+pub trait Memory: MemorySpec + private::Sealed {}
 
-impl RefKind for ManuallyManaged {}
+impl Memory for ManuallyManaged {}
 impl private::Sealed for ManuallyManaged {}
 
-impl RefKind for RefCounted {}
+impl Memory for RefCounted {}
 impl private::Sealed for RefCounted {}
+
 mod private {
     pub trait Sealed {}
 }