arrow2/bitmap/
iterator.rs

1use crate::trusted_len::TrustedLen;
2
3use super::Bitmap;
4
5/// This crates' equivalent of [`std::vec::IntoIter`] for [`Bitmap`].
6#[derive(Debug, Clone)]
7pub struct IntoIter {
8    values: Bitmap,
9    index: usize,
10    end: usize,
11}
12
13impl IntoIter {
14    /// Creates a new [`IntoIter`] from a [`Bitmap`]
15    #[inline]
16    pub fn new(values: Bitmap) -> Self {
17        let end = values.len();
18        Self {
19            values,
20            index: 0,
21            end,
22        }
23    }
24}
25
26impl Iterator for IntoIter {
27    type Item = bool;
28
29    #[inline]
30    fn next(&mut self) -> Option<Self::Item> {
31        if self.index == self.end {
32            return None;
33        }
34        let old = self.index;
35        self.index += 1;
36        Some(unsafe { self.values.get_bit_unchecked(old) })
37    }
38
39    #[inline]
40    fn size_hint(&self) -> (usize, Option<usize>) {
41        (self.end - self.index, Some(self.end - self.index))
42    }
43
44    #[inline]
45    fn nth(&mut self, n: usize) -> Option<Self::Item> {
46        let new_index = self.index + n;
47        if new_index > self.end {
48            self.index = self.end;
49            None
50        } else {
51            self.index = new_index;
52            self.next()
53        }
54    }
55}
56
57impl DoubleEndedIterator for IntoIter {
58    #[inline]
59    fn next_back(&mut self) -> Option<Self::Item> {
60        if self.index == self.end {
61            None
62        } else {
63            self.end -= 1;
64            Some(unsafe { self.values.get_bit_unchecked(self.end) })
65        }
66    }
67}
68
69unsafe impl TrustedLen for IntoIter {}
arrow2/bitmap/iterator.rs

arrow2/bitmap/
iterator.rs
