Modified arith operator semantics

Author: 9prady9

src/array.rs

@@ -57,6 +57,8 @@ extern {
 
     fn af_eval(arr: AfArray) -> c_int;
 
+    fn af_retain_array(out: MutAfArray, arr: AfArray) -> c_int;
+
     fn af_release_array(arr: AfArray) -> c_int;
 
     fn af_print_array(arr: AfArray) -> c_int;
@@ -153,6 +155,16 @@ impl Array {
     is_func!(is_bool, af_is_bool);
 }
 
+impl Clone for Array {
+    fn clone(&self) -> Array {
+        unsafe {
+            let mut temp: i64 = 0;
+            af_retain_array(&mut temp as MutAfArray, self.handle as AfArray);
+            Array {handle: temp}
+        }
+    }
+}
+
 impl Drop for Array {
     fn drop(&mut self) {
         unsafe {

tests/hello_world.rs

@@ -19,6 +19,9 @@ fn main() {
     let b: Array = af::sin(&a) + 1.5;
     af::print(&b);
 
+    let test = a.clone() + b.clone();
+    af::print(&test);
+
     // printf("Negate the first three elements of second column\n");
     // B(seq(0, 2), 1) = B(seq(0, 2), 1) * -1;
     // af_print(B);