chore: more macro's

Author: joeydewaal

sqlx-core/src/decode.rs

@@ -82,17 +82,24 @@ where
     }
 }
 
-// implement `Decode` for Arc<T> for all SQL types
-impl<'r, DB, T> Decode<'r, DB> for Arc<T>
-where
-    DB: Database,
-    T: Decode<'r, DB>,
-{
-    fn decode(value: <DB as Database>::ValueRef<'r>) -> Result<Self, BoxDynError> {
-        Ok(Arc::new(T::decode(value)?))
-    }
+macro_rules! impl_decode_for_smartpointer {
+    ($smart_pointer:ty) => {
+        impl<'r, DB, T> Decode<'r, DB> for $smart_pointer
+        where
+            DB: Database,
+            T: Decode<'r, DB>,
+        {
+            fn decode(value: <DB as Database>::ValueRef<'r>) -> Result<Self, BoxDynError> {
+                Ok(Self::new(T::decode(value)?))
+            }
+        }
+    };
 }
 
+impl_decode_for_smartpointer!(Arc<T>);
+impl_decode_for_smartpointer!(Box<T>);
+impl_decode_for_smartpointer!(Rc<T>);
+
 // implement `Decode` for Cow<T> for all SQL types
 impl<'r, DB, T> Decode<'r, DB> for Cow<'_, T>
 where
@@ -104,25 +111,3 @@ where
         Ok(Cow::Owned(T::decode(value)?))
     }
 }
-
-// implement `Decode` for Box<T> for all SQL types
-impl<'r, DB, T> Decode<'r, DB> for Box<T>
-where
-    DB: Database,
-    T: Decode<'r, DB>,
-{
-    fn decode(value: <DB as Database>::ValueRef<'r>) -> Result<Self, BoxDynError> {
-        Ok(Box::new(T::decode(value)?))
-    }
-}
-
-// implement `Decode` for Rc<T> for all SQL types
-impl<'r, DB, T> Decode<'r, DB> for Rc<T>
-where
-    DB: Database,
-    T: Decode<'r, DB>,
-{
-    fn decode(value: <DB as Database>::ValueRef<'r>) -> Result<Self, BoxDynError> {
-        Ok(Rc::new(T::decode(value)?))
-    }
-}