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
use std;
use std::ops::Index;
pub(crate) fn write_implode<T, I, S>(f: &mut std::fmt::Formatter, sep: S, it: I) -> std::fmt::Result
where
T: std::fmt::Display,
I: std::iter::Iterator<Item = T>,
S: std::fmt::Display,
{
write_implode_with(f, sep, it, |f, x| x.fmt(f))
}
pub(crate) fn write_implode_with<T, I, S, F>(
f: &mut std::fmt::Formatter,
sep: S,
mut it: I,
write: F,
) -> std::fmt::Result
where
I: std::iter::Iterator<Item = T>,
S: std::fmt::Display,
F: Fn(&mut std::fmt::Formatter, T) -> std::fmt::Result,
{
if let Some(x) = it.next() {
write(f, x)?;
}
for x in it {
write!(f, "{}", sep)?;
write(f, x)?;
}
Ok(())
}
pub struct IndirectMapIter<'tf, T: Iterator + 'tf, V: 'tf> {
refs: T,
map: &'tf Index<T::Item, Output = V>,
}
impl<'tf, T: Iterator + 'tf, V> IndirectMapIter<'tf, T, V> {
pub fn new(refs: T, map: &'tf Index<T::Item, Output = V>) -> IndirectMapIter<'tf, T, V> {
IndirectMapIter {
refs: refs,
map: map,
}
}
}
impl<'tf, T: Iterator + 'tf, V> Iterator for IndirectMapIter<'tf, T, V> {
type Item = &'tf V;
fn next(&mut self) -> Option<&'tf V> {
self.refs.next().map(|r| &self.map[r])
}
}