Add default Ownership to NSArray and NSMutableArray

Author: madsmtm

objc2/CHANGELOG_FOUNDATION.md

@@ -20,6 +20,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   of the `NSValue` matches the encoding of the given type.
 * Added functions `get_range`, `get_point`, `get_size` and `get_rect` to
   `NSValue` to help safely returning various types it will commonly contain.
+* `NSArray` and `NSMutableArray` now have sensible defaults for the ownership
+  of the objects they contain.
 
 ### Changed
 * **BREAKING**: Moved from external crate `objc2_foundation` into

objc2/src/foundation/array.rs

@@ -53,7 +53,7 @@ __inner_extern_class! {
     // `T: PartialEq` bound correct because `NSArray` does deep (instead of
     // shallow) equality comparisons.
     #[derive(PartialEq, Eq, Hash)]
-    unsafe pub struct NSArray<T: Message, O: Ownership>: NSObject {
+    unsafe pub struct NSArray<T: Message, O: Ownership = Shared>: NSObject {
         item: PhantomData<Id<T, O>>,
         notunwindsafe: PhantomData<&'static mut ()>,
     }
@@ -324,13 +324,13 @@ mod tests {
 
     #[test]
     fn test_two_empty() {
-        let _empty_array1 = NSArray::<NSObject, Shared>::new();
-        let _empty_array2 = NSArray::<NSObject, Shared>::new();
+        let _empty_array1 = NSArray::<NSObject>::new();
+        let _empty_array2 = NSArray::<NSObject>::new();
     }
 
     #[test]
     fn test_len() {
-        let empty_array = NSArray::<NSObject, Shared>::new();
+        let empty_array = NSArray::<NSObject>::new();
         assert_eq!(empty_array.len(), 0);
 
         let array = sample_array(4);
@@ -367,7 +367,7 @@ mod tests {
         assert_eq!(array.first(), array.get(0));
         assert_eq!(array.last(), array.get(3));
 
-        let empty_array = <NSArray<NSObject, Shared>>::new();
+        let empty_array = <NSArray<NSObject>>::new();
         assert!(empty_array.first().is_none());
         assert!(empty_array.last().is_none());
     }

objc2/src/foundation/mutable_array.rs

@@ -22,7 +22,7 @@ __inner_extern_class! {
     ///
     /// [apple-doc]: https://developer.apple.com/documentation/foundation/nsmutablearray?language=objc
     #[derive(PartialEq, Eq, Hash)]
-    unsafe pub struct NSMutableArray<T: Message, O: Ownership>: NSArray<T, O>, NSObject {
+    unsafe pub struct NSMutableArray<T: Message, O: Ownership = Owned>: NSArray<T, O>, NSObject {
         p: PhantomData<*mut ()>,
     }
 }

objc2/src/macros/extern_class.rs

@@ -189,14 +189,14 @@ macro_rules! __inner_extern_class {
     // TODO: Expose this variant in the `object` macro.
     (
         $(#[$m:meta])*
-        unsafe $v:vis struct $name:ident<$($t:ident $(: $b:ident)?),*>: $($inheritance_chain:ty),+ {
+        unsafe $v:vis struct $name:ident<$($t:ident $(: $b:ident $(= $default:ty)?)?),*>: $($inheritance_chain:ty),+ {
             $($field_vis:vis $field:ident: $field_ty:ty,)*
         }
     ) => {
         $crate::__inner_extern_class! {
             @__inner
             $(#[$m])*
-            unsafe $v struct $name<$($t $(: $b)?),*>: $($inheritance_chain,)+ $crate::runtime::Object {
+            unsafe $v struct $name<$($t $(: $b $(= $default)?)?),*>: $($inheritance_chain,)+ $crate::runtime::Object {
                 $($field_vis $field: $field_ty,)*
             }
         }
@@ -217,14 +217,14 @@ macro_rules! __inner_extern_class {
     (
         @__inner
         $(#[$m:meta])*
-        unsafe $v:vis struct $name:ident<$($t:ident $(: $b:ident)?),*>: $superclass:ty $(, $inheritance_rest:ty)* {
+        unsafe $v:vis struct $name:ident<$($t:ident $(: $b:ident $(= $default:ty)?)?),*>: $superclass:ty $(, $inheritance_rest:ty)* {
             $($field_vis:vis $field:ident: $field_ty:ty,)*
         }
     ) => {
         $(#[$m])*
         // TODO: repr(transparent) when the inner pointer is no longer a ZST.
         #[repr(C)]
-        $v struct $name<$($t $(: $b)?),*> {
+        $v struct $name<$($t $(: $b $(= $default)?)?),*> {
             __inner: $superclass,
             // Additional fields (should only be zero-sized PhantomData or ivars).
             $($field_vis $field: $field_ty,)*