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use {Ix, Ix0, Ix1, Dimension, Dim, Axis};
use super::DimPrivate;
pub trait RemoveAxis : Dimension {
type Smaller: Dimension;
fn remove_axis(&self, axis: Axis) -> Self::Smaller;
}
impl RemoveAxis for Dim<[Ix; 1]> {
type Smaller = Ix0;
#[inline]
fn remove_axis(&self, _: Axis) -> Ix0 { Ix0() }
}
impl RemoveAxis for Dim<[Ix; 2]> {
type Smaller = Ix1;
#[inline]
fn remove_axis(&self, axis: Axis) -> Ix1 {
let axis = axis.axis();
debug_assert!(axis < self.ndim());
if axis == 0 { Ix1(get!(self, 1)) } else { Ix1(get!(self, 0)) }
}
}
macro_rules! impl_remove_axis_array(
($($n:expr),*) => (
$(
impl RemoveAxis for Dim<[Ix; $n]>
{
type Smaller = Dim<[Ix; $n - 1]>;
#[inline]
fn remove_axis(&self, axis: Axis) -> Self::Smaller {
let mut tup = Dim([0; $n - 1]);
{
let mut it = tup.slice_mut().iter_mut();
for (i, &d) in self.slice().iter().enumerate() {
if i == axis.axis() {
continue;
}
for rr in it.by_ref() {
*rr = d;
break
}
}
}
tup
}
}
)*
);
);
impl_remove_axis_array!(3, 4, 5, 6);
impl RemoveAxis for Dim<Vec<Ix>> {
type Smaller = Self;
fn remove_axis(&self, axis: Axis) -> Self {
let mut res = self.clone();
res.ixm().remove(axis.axis());
res
}
}