Avoid enumerating the iterators in PyArray1::from_slice and ArrayBase::to_pyarray.

Author: adamreichold

src/array.rs

@@ -957,9 +957,10 @@ impl<T: Element> PyArray<T, Ix1> {
             if T::IS_COPY {
                 ptr::copy_nonoverlapping(slice.as_ptr(), array.data(), slice.len());
             } else {
-                let data_ptr = array.data();
-                for (i, item) in slice.iter().enumerate() {
-                    data_ptr.add(i).write(item.clone());
+                let mut data_ptr = array.data();
+                for item in slice {
+                    data_ptr.write(item.clone());
+                    data_ptr = data_ptr.add(1);
                 }
             }
             array

src/convert.rs

@@ -142,9 +142,10 @@ where
                 );
                 unsafe {
                     let array = PyArray::<A, _>::new_(py, dim, strides.as_ptr(), 0);
-                    let data_ptr = array.data();
-                    for (i, item) in self.iter().enumerate() {
-                        data_ptr.add(i).write(item.clone());
+                    let mut data_ptr = array.data();
+                    for item in self.iter() {
+                        data_ptr.write(item.clone());
+                        data_ptr = data_ptr.add(1);
                     }
                     array
                 }