Improve NSComparisonResult

objc2_foundation/src/array.rs

@@ -288,7 +288,7 @@ pub unsafe trait INSMutableArray: INSArray {
             // ownership, and that method only runs one function at a time.
             let closure: &mut F = unsafe { &mut *(context as *mut F) };
 
-            NSComparisonResult::from_ordering((*closure)(obj1, obj2))
+            NSComparisonResult::from((*closure)(obj1, obj2))
         }
 
         let f: extern "C" fn(_, _, _) -> _ = compare_with_closure::<Self::Item, F>;

objc2_foundation/src/comparison_result.rs

@@ -1,33 +1,45 @@
 use core::cmp::Ordering;
 
-use objc2::{Encode, Encoding};
+use objc2::{Encode, Encoding, RefEncode};
 
 #[repr(isize)]
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub enum NSComparisonResult {
     Ascending = -1,
     Same = 0,
     Descending = 1,
 }
 
+impl Default for NSComparisonResult {
+    fn default() -> Self {
+        Self::Same
+    }
+}
+
 unsafe impl Encode for NSComparisonResult {
     const ENCODING: Encoding<'static> = isize::ENCODING;
 }
 
-impl NSComparisonResult {
-    pub fn from_ordering(order: Ordering) -> NSComparisonResult {
+unsafe impl RefEncode for NSComparisonResult {
+    const ENCODING_REF: Encoding<'static> = Encoding::Pointer(&Self::ENCODING);
+}
+
+impl From<Ordering> for NSComparisonResult {
+    fn from(order: Ordering) -> Self {
         match order {
-            Ordering::Less => NSComparisonResult::Ascending,
-            Ordering::Equal => NSComparisonResult::Same,
-            Ordering::Greater => NSComparisonResult::Descending,
+            Ordering::Less => Self::Ascending,
+            Ordering::Equal => Self::Same,
+            Ordering::Greater => Self::Descending,
         }
     }
+}
 
-    pub fn as_ordering(&self) -> Ordering {
-        match *self {
-            NSComparisonResult::Ascending => Ordering::Less,
-            NSComparisonResult::Same => Ordering::Equal,
-            NSComparisonResult::Descending => Ordering::Greater,
+impl From<NSComparisonResult> for Ordering {
+    fn from(comparison_result: NSComparisonResult) -> Self {
+        match comparison_result {
+            NSComparisonResult::Ascending => Self::Less,
+            NSComparisonResult::Same => Self::Equal,
+            NSComparisonResult::Descending => Self::Greater,
         }
     }
 }