Fix comparison functions output type

examples/conway.rs

@@ -24,6 +24,6 @@ fn conways_game_of_life() {
         let c0 = &eq(&n_hood, &c0, false);
         let c1 = &eq(&n_hood, &c1, false);
         state = state * c0 + c1;
-        win.draw_image(&normalise(&state), None);
+        win.draw_image(&normalise(&state.cast::<f32>()), None);
     }
 }

src/arith/mod.rs

@@ -433,17 +433,6 @@ macro_rules! overloaded_binary_func {
         ///
         /// An Array with results of the binary operation.
         ///
-        /// In the case of comparison operations such as the following, the type of output
-        /// Array is [DType::B8](./enum.DType.html). To retrieve the results of such boolean output
-        /// to host, an array of 8-bit wide types(eg. u8, i8) should be used since ArrayFire's internal
-        /// implementation uses char for boolean.
-        ///
-        /// * [gt](./fn.gt.html)
-        /// * [lt](./fn.lt.html)
-        /// * [ge](./fn.ge.html)
-        /// * [le](./fn.le.html)
-        /// * [eq](./fn.eq.html)
-        ///
         ///# Note
         ///
         /// The trait `Convertable` essentially translates to a scalar native type on rust or Array.
@@ -487,55 +476,123 @@ overloaded_binary_func!("Compute remainder from two Arrays", rem, rem_helper, af
 overloaded_binary_func!("Compute left shift", shiftl, shiftl_helper, af_bitshiftl);
 overloaded_binary_func!("Compute right shift", shiftr, shiftr_helper, af_bitshiftr);
 overloaded_binary_func!(
+    "Compute modulo of two Arrays",
+    modulo,
+    modulo_helper,
+    af_mod
+);
+overloaded_binary_func!(
+    "Calculate atan2 of two Arrays",
+    atan2,
+    atan2_helper,
+    af_atan2
+);
+overloaded_binary_func!(
+    "Create complex array from two Arrays",
+    cplx2,
+    cplx2_helper,
+    af_cplx2
+);
+overloaded_binary_func!("Compute root", root, root_helper, af_root);
+overloaded_binary_func!("Computer power", pow, pow_helper, af_pow);
+
+macro_rules! overloaded_compare_func {
+    ($doc_str: expr, $fn_name: ident, $help_name: ident, $ffi_name: ident) => {
+        fn $help_name<A, B>(lhs: &Array<A>, rhs: &Array<B>, batch: bool) -> Array<bool>
+        where
+            A: HasAfEnum + ImplicitPromote<B>,
+            B: HasAfEnum + ImplicitPromote<A>,
+        {
+            let mut temp: i64 = 0;
+            unsafe {
+                let err_val = $ffi_name(
+                    &mut temp as MutAfArray,
+                    lhs.get() as AfArray,
+                    rhs.get() as AfArray,
+                    batch as c_int,
+                );
+                HANDLE_ERROR(AfError::from(err_val));
+            }
+            temp.into()
+        }
+
+        #[doc=$doc_str]
+        ///
+        /// This is a comparison operation.
+        ///
+        ///# Parameters
+        ///
+        /// - `arg1`is an argument that implements an internal trait `Convertable`.
+        /// - `arg2`is an argument that implements an internal trait `Convertable`.
+        /// - `batch` is an boolean that indicates if the current operation is an batch operation.
+        ///
+        /// Both parameters `arg1` and `arg2` can be either an Array or a value of rust integral
+        /// type.
+        ///
+        ///# Return Values
+        ///
+        /// An Array with results of the comparison operation a.k.a an Array of boolean values.
+        ///# Note
+        ///
+        /// The trait `Convertable` essentially translates to a scalar native type on rust or Array.
+        pub fn $fn_name<T, U>(
+            arg1: &T,
+            arg2: &U,
+            batch: bool,
+        ) -> Array<bool>
+        where
+            T: Convertable,
+            U: Convertable,
+            <T as Convertable>::OutType: HasAfEnum + ImplicitPromote<<U as Convertable>::OutType>,
+            <U as Convertable>::OutType: HasAfEnum + ImplicitPromote<<T as Convertable>::OutType>,
+        {
+            let lhs = arg1.convert(); // Convert to Array<T>
+            let rhs = arg2.convert(); // Convert to Array<T>
+            match (lhs.is_scalar(), rhs.is_scalar()) {
+                (true, false) => {
+                    let l = tile(&lhs, rhs.dims());
+                    $help_name(&l, &rhs, batch)
+                }
+                (false, true) => {
+                    let r = tile(&rhs, lhs.dims());
+                    $help_name(&lhs, &r, batch)
+                }
+                _ => $help_name(&lhs, &rhs, batch),
+            }
+        }
+    };
+}
+
+overloaded_compare_func!(
     "Perform `less than` comparison operation",
     lt,
     lt_helper,
     af_lt
 );
-overloaded_binary_func!(
+overloaded_compare_func!(
     "Perform `greater than` comparison operation",
     gt,
     gt_helper,
     af_gt
 );
-overloaded_binary_func!(
+overloaded_compare_func!(
     "Perform `less than equals` comparison operation",
     le,
     le_helper,
     af_le
 );
-overloaded_binary_func!(
+overloaded_compare_func!(
     "Perform `greater than equals` comparison operation",
     ge,
     ge_helper,
     af_ge
 );
-overloaded_binary_func!(
+overloaded_compare_func!(
     "Perform `equals` comparison operation",
     eq,
     eq_helper,
     af_eq
 );
-overloaded_binary_func!(
-    "Compute modulo of two Arrays",
-    modulo,
-    modulo_helper,
-    af_mod
-);
-overloaded_binary_func!(
-    "Calculate atan2 of two Arrays",
-    atan2,
-    atan2_helper,
-    af_atan2
-);
-overloaded_binary_func!(
-    "Create complex array from two Arrays",
-    cplx2,
-    cplx2_helper,
-    af_cplx2
-);
-overloaded_binary_func!("Compute root", root, root_helper, af_root);
-overloaded_binary_func!("Computer power", pow, pow_helper, af_pow);
 
 fn clamp_helper<X, Y>(
     inp: &Array<X>,