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conversions.rs
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conversions.rs
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// Copyright 2014-2016 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.
use std::slice;
use crate::imp_prelude::*;
use crate::{Baseiter, ElementsBase, ElementsBaseMut, Iter, IterMut};
use crate::iter::{self, AxisIter, AxisIterMut};
use crate::IndexLonger;
/// Methods for read-only array views.
impl<'a, A, D> ArrayView<'a, A, D>
where
D: Dimension,
{
/// Convert the view into an `ArrayView<'b, A, D>` where `'b` is a lifetime
/// outlived by `'a'`.
pub fn reborrow<'b>(self) -> ArrayView<'b, A, D>
where
'a: 'b,
{
unsafe { ArrayView::new_(self.as_ptr(), self.dim, self.strides) }
}
/// Return the array’s data as a slice, if it is contiguous and in standard order.
/// Return `None` otherwise.
#[deprecated(note = "`into_slice` has been renamed to `to_slice`", since = "0.13.0")]
#[allow(clippy::wrong_self_convention)]
pub fn into_slice(&self) -> Option<&'a [A]> {
if self.is_standard_layout() {
unsafe { Some(slice::from_raw_parts(self.ptr, self.len())) }
} else {
None
}
}
/// Return the array’s data as a slice, if it is contiguous and in standard order.
/// Return `None` otherwise.
pub fn to_slice(&self) -> Option<&'a [A]> {
if self.is_standard_layout() {
unsafe { Some(slice::from_raw_parts(self.ptr, self.len())) }
} else {
None
}
}
/// Converts to a raw array view.
pub(crate) fn into_raw_view(self) -> RawArrayView<A, D> {
unsafe { RawArrayView::new_(self.ptr, self.dim, self.strides) }
}
}
/// Methods specific to `ArrayView0`.
///
/// ***See also all methods for [`ArrayView`] and [`ArrayBase`]***
///
/// [`ArrayBase`]: struct.ArrayBase.html
/// [`ArrayView`]: struct.ArrayView.html
impl<'a, A> ArrayView<'a, A, Ix0> {
/// Consume the view and returns a reference to the single element in the array.
///
/// The lifetime of the returned reference matches the lifetime of the data
/// the array view was pointing to.
///
/// ```
/// use ndarray::{arr0, Array0};
///
/// // `Foo` doesn't implement `Clone`.
/// #[derive(Debug, Eq, PartialEq)]
/// struct Foo;
///
/// let array: Array0<Foo> = arr0(Foo);
/// let view = array.view();
/// let scalar: &Foo = view.into_scalar();
/// assert_eq!(scalar, &Foo);
/// ```
pub fn into_scalar(self) -> &'a A {
self.index(Ix0())
}
}
/// Methods for read-write array views.
impl<'a, A, D> ArrayViewMut<'a, A, D>
where
D: Dimension,
{
/// Return the array’s data as a slice, if it is contiguous and in standard order.
/// Return `None` otherwise.
pub fn into_slice(self) -> Option<&'a mut [A]> {
self.into_slice_().ok()
}
}
/// Private array view methods
impl<'a, A, D> ArrayView<'a, A, D>
where
D: Dimension,
{
#[inline]
pub(crate) fn into_base_iter(self) -> Baseiter<A, D> {
unsafe { Baseiter::new(self.ptr, self.dim, self.strides) }
}
#[inline]
pub(crate) fn into_elements_base(self) -> ElementsBase<'a, A, D> {
ElementsBase::new(self)
}
pub(crate) fn into_iter_(self) -> Iter<'a, A, D> {
Iter::new(self)
}
/// Return an outer iterator for this view.
#[doc(hidden)] // not official
#[deprecated(note = "This method will be replaced.")]
pub fn into_outer_iter(self) -> iter::AxisIter<'a, A, D::Smaller>
where
D: RemoveAxis,
{
AxisIter::new(self, Axis(0))
}
}
impl<'a, A, D> ArrayViewMut<'a, A, D>
where
D: Dimension,
{
// Convert into a read-only view
pub(crate) fn into_view(self) -> ArrayView<'a, A, D> {
unsafe { ArrayView::new_(self.ptr, self.dim, self.strides) }
}
/// Converts to a mutable raw array view.
pub(crate) fn into_raw_view_mut(self) -> RawArrayViewMut<A, D> {
unsafe { RawArrayViewMut::new_(self.ptr, self.dim, self.strides) }
}
#[inline]
pub(crate) fn into_base_iter(self) -> Baseiter<A, D> {
unsafe { Baseiter::new(self.ptr, self.dim, self.strides) }
}
#[inline]
pub(crate) fn into_elements_base(self) -> ElementsBaseMut<'a, A, D> {
ElementsBaseMut::new(self)
}
pub(crate) fn into_slice_(self) -> Result<&'a mut [A], Self> {
if self.is_standard_layout() {
unsafe { Ok(slice::from_raw_parts_mut(self.ptr, self.len())) }
} else {
Err(self)
}
}
pub(crate) fn into_iter_(self) -> IterMut<'a, A, D> {
IterMut::new(self)
}
/// Return an outer iterator for this view.
#[doc(hidden)] // not official
#[deprecated(note = "This method will be replaced.")]
pub fn into_outer_iter(self) -> iter::AxisIterMut<'a, A, D::Smaller>
where
D: RemoveAxis,
{
AxisIterMut::new(self, Axis(0))
}
}