mop-structs 0.0.10

Low-level structures for MOP
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

use crate::{
  dim::Dim,
  vec::css::{CssSlice, CssSliceMut},
};
use core::slice::{from_raw_parts, from_raw_parts_mut};

macro_rules! impl_iter (
    (
        $csr_matrix_row_iter:ident,
        $data_ptr:ty,
        $data_type:ty,
        $from_raw_parts:ident,
        $css_slice:ident
    ) => (

#[derive(Debug)]
pub struct $csr_matrix_row_iter<'a, T: 'a> {
    curr_row: usize,
    data: $data_ptr,
    dim: Dim<[usize; 2]>,
    indcs: &'a [usize],
    ptrs: &'a [usize],
}

impl<'a, T> $csr_matrix_row_iter<'a, T> {
    pub(crate) fn new(
        dim: [usize; 2],
        data: $data_ptr,
        indcs: &'a [usize],
        ptrs: &'a [usize]
    ) -> Self {
        $csr_matrix_row_iter {
            curr_row: 0,
            data,
            dim: dim.into(),
            indcs,
            ptrs,
        }
    }

    pub fn split_at(self, idx: usize) -> (Self, Self) {
        let current_len = self.dim.rows() - self.curr_row;
        assert!(idx <= current_len);
        let slice_point = self.curr_row + idx;
        (
            $csr_matrix_row_iter {
                curr_row: self.curr_row,
                data: self.data,
                dim: [slice_point, self.dim.cols()].into(),
                indcs: self.indcs,
                ptrs: self.ptrs,
            },
            $csr_matrix_row_iter {
                curr_row: slice_point,
                data: self.data,
                dim: self.dim,
                indcs: self.indcs,
                ptrs: self.ptrs,
            },
        )
    }
}

impl<'a, T> DoubleEndedIterator for $csr_matrix_row_iter<'a, T> {
    fn next_back(&mut self) -> Option<Self::Item> {
        if self.curr_row >= self.dim.rows() {
            return None;
        }
        let starting_row_ptr = self.ptrs[self.dim.rows() - 1];
        let finishing_row_ptr = self.ptrs[self.dim.rows()];
        let data: $data_type = unsafe {
            let ptr = self.data.add(starting_row_ptr);
            let len = finishing_row_ptr - starting_row_ptr;
            $from_raw_parts(ptr, len)
        };
        *self.dim.rows_mut() -= 1;
        Some($css_slice::new(
            self.dim.cols(),
            data,
            &self.indcs[starting_row_ptr..finishing_row_ptr],
        ))
    }
}

impl<'a, T> ExactSizeIterator for $csr_matrix_row_iter<'a, T> {}

impl<'a, T> Iterator for $csr_matrix_row_iter<'a, T> {
    type Item = $css_slice<'a, T>;

    fn next(&mut self) -> Option<Self::Item> {
        if self.curr_row >= self.dim.rows() {
            return None;
        }

        let starting_row_ptr = self.ptrs[self.curr_row];
        let finishing_row_ptr = self.ptrs[self.curr_row + 1];

        let data: $data_type = unsafe {
            let ptr = self.data.add(starting_row_ptr);
            $from_raw_parts(ptr, finishing_row_ptr - starting_row_ptr)
        };

        self.curr_row += 1;

        Some($css_slice::new(
            self.dim.cols(),
            data,
            &self.indcs[starting_row_ptr..finishing_row_ptr],
        ))
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        (self.dim.rows(), Some(self.dim.rows()))
    }
}

unsafe impl<'a, T> Send for $csr_matrix_row_iter<'a, T> {}
unsafe impl<'a, T> Sync for $csr_matrix_row_iter<'a, T> {}

    );
);

impl_iter!(
  CsrMatrixRowIter,
  *const T,
  &'a [T],
  from_raw_parts,
  CssSlice
);
impl_iter!(
  CsrMatrixRowIterMut,
  *mut T,
  &'a mut [T],
  from_raw_parts_mut,
  CssSliceMut
);