order: Add enum Order

Author: bluss

src/lib.rs

@@ -145,6 +145,7 @@ pub use crate::dimension::IxDynImpl;
 pub use crate::dimension::NdIndex;
 pub use crate::error::{ErrorKind, ShapeError};
 pub use crate::indexes::{indices, indices_of};
+pub use crate::order::Order;
 pub use crate::slice::{
     MultiSliceArg, NewAxis, Slice, SliceArg, SliceInfo, SliceInfoElem, SliceNextDim,
 };
@@ -202,6 +203,7 @@ mod linspace;
 mod logspace;
 mod math_cell;
 mod numeric_util;
+mod order;
 mod partial;
 mod shape_builder;
 #[macro_use]

src/order.rs

@@ -0,0 +1,23 @@
+
+/// Array order description
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[non_exhaustive]
+pub enum Order {
+    /// Row major or "C" order
+    RowMajor,
+    /// Column major or "F" order
+    ColumnMajor,
+    /// Try to preserve the input order
+    Automatic,
+}
+
+impl Order {
+    /// "C" is an alias for row major ordering
+    pub const C: Order = Order::RowMajor;
+
+    /// "F" (for Fortran) is an alias for column major ordering
+    pub const F: Order = Order::ColumnMajor;
+
+    /// "A"  is an alias for automatic ordering
+    pub const A: Order = Order::Automatic;
+}