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
pub struct RepeatCall<F> {
f: F,
}
impl<F> RepeatCall<F>
{
pub fn new<A>(func: F) -> Self where
F: FnMut() -> A,
{
RepeatCall { f: func }
}
}
impl<A, F> Iterator for RepeatCall<F> where
F: FnMut() -> A,
{
type Item = A;
#[inline]
fn next(&mut self) -> Option<A>
{
Some((self.f)())
}
fn size_hint(&self) -> (usize, Option<usize>)
{
(usize::max_value(), None)
}
}
impl<A, F> DoubleEndedIterator for RepeatCall<F> where
F: FnMut() -> A,
{
#[inline]
fn next_back(&mut self) -> Option<A> { self.next() }
}