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use {ArrayBase, Data};
use super::Dimension;
use dimension::IntoDimension;
#[derive(Clone)]
pub struct Indices<D> {
dim: D,
index: Option<D>,
}
pub fn indices<E>(shape: E) -> Indices<E::Dim>
where E: IntoDimension,
{
let dim = shape.into_dimension();
Indices {
index: dim.first_index(),
dim: dim,
}
}
pub fn indices_of<S, D>(array: &ArrayBase<S, D>) -> Indices<D>
where S: Data, D: Dimension,
{
indices(array.dim())
}
impl<D> Iterator for Indices<D>
where D: Dimension,
{
type Item = D::Pattern;
#[inline]
fn next(&mut self) -> Option<Self::Item> {
let index = match self.index {
None => return None,
Some(ref ix) => ix.clone(),
};
self.index = self.dim.next_for(index.clone());
Some(index.into_pattern())
}
fn size_hint(&self) -> (usize, Option<usize>) {
let l = match self.index {
None => 0,
Some(ref ix) => {
let gone = self.dim
.default_strides()
.slice()
.iter()
.zip(ix.slice().iter())
.fold(0, |s, (&a, &b)| s + a as usize * b as usize);
self.dim.size() - gone
}
};
(l, Some(l))
}
}
impl<D> ExactSizeIterator for Indices<D>
where D: Dimension
{}