ndarray 0.13.0

An n-dimensional array for general elements and for numerics. Lightweight array views and slicing; views support chunking and splitting.
Documentation 
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// Copyright 2016 bluss and ndarray developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

/// An axis index.
///
/// An axis one of an array’s “dimensions”; an *n*-dimensional array has *n* axes.
/// Axis *0* is the array’s outermost axis and *n*-1 is the innermost.
///
/// All array axis arguments use this type to make the code easier to write
/// correctly and easier to understand.
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct Axis(pub usize);

impl Axis {
    /// Return the index of the axis.
    #[inline(always)]
    pub fn index(self) -> usize {
        self.0
    }
}