Implemented DerefMut for the owned Id.

This closes #5.

Author: SSheldon

examples/custom_class.rs

@@ -53,7 +53,7 @@ fn main() {
 	let mut obj: Id<MYObject> = INSObject::new();
 	println!("{}", obj);
 
-	obj.deref_mut().set_number(7);
+	obj.set_number(7);
 	println!("Number: {}", obj.number());
 
 	unsafe {

foundation/array.rs

@@ -339,24 +339,24 @@ mod tests {
 	fn test_add_object() {
 		let mut array: Id<NSMutableArray<NSObject>> = INSObject::new();
 		let obj: Id<NSObject> = INSObject::new();
-		array.deref_mut().add_object(obj);
+		array.add_object(obj);
 
 		assert!(array.len() == 1);
 		assert!(array.object_at(0) == array.object_at(0));
 
 		let obj: Id<NSObject> = INSObject::new();
-		array.deref_mut().insert_object_at(0, obj);
+		array.insert_object_at(0, obj);
 		assert!(array.len() == 2);
 	}
 
 	#[test]
 	fn test_replace_object() {
 		let mut array: Id<NSMutableArray<NSObject>> = INSObject::new();
 		let obj: Id<NSObject> = INSObject::new();
-		array.deref_mut().add_object(obj);
+		array.add_object(obj);
 
 		let obj: Id<NSObject> = INSObject::new();
-		let old_obj = array.deref_mut().replace_object_at(0, obj);
+		let old_obj = array.replace_object_at(0, obj);
 		assert!(&*old_obj != array.object_at(0));
 	}
 
@@ -365,16 +365,16 @@ mod tests {
 		let mut array: Id<NSMutableArray<NSObject>> = INSObject::new();
 		for _ in range(0u, 4) {
 			let obj: Id<NSObject> = INSObject::new();
-			array.deref_mut().add_object(obj);
+			array.add_object(obj);
 		}
 
-		array.deref_mut().remove_object_at(1);
+		array.remove_object_at(1);
 		assert!(array.len() == 3);
 
-		array.deref_mut().remove_last_object();
+		array.remove_last_object();
 		assert!(array.len() == 2);
 
-		array.deref_mut().remove_all_objects();
+		array.remove_all_objects();
 		assert!(array.is_empty());
 	}
 }

id.rs

@@ -53,10 +53,6 @@ impl<T: Message> Id<T, Owned> {
 			mem::transmute(self)
 		}
 	}
-
-	pub fn deref_mut(&mut self) -> &mut T {
-		unsafe { &mut *self.ptr }
-	}
 }
 
 impl<T: Message, O: Ownership> ToMessage for Id<T, O> {
@@ -89,6 +85,12 @@ impl<T: Message, O: Ownership> Deref<T> for Id<T, O> {
 	}
 }
 
+impl<T: Message> DerefMut<T> for Id<T, Owned> {
+	fn deref_mut(&mut self) -> &mut T {
+		unsafe { &mut *self.ptr }
+	}
+}
+
 impl<T: Message + PartialEq, O: Ownership> PartialEq for Id<T, O> {
 	fn eq(&self, other: &Id<T, O>) -> bool {
 		self.deref() == other.deref()