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#[derive(Debug)] | |
struct S { | |
v: Vec<i32>, | |
} | |
impl S { | |
fn objects_at(&self, pos: i32) -> ObjectsIter { | |
ObjectsIter { it: self.v.iter(), pos: pos } | |
} | |
} | |
struct ObjectsIter<'a> { | |
it: std::slice::Iter<'a, i32>, | |
pos: i32, | |
} | |
impl<'a> Iterator for ObjectsIter<'a> { | |
type Item = i32; | |
fn next (&mut self) -> Option<Self::Item> { | |
while let Some(p) = self.it.next() { | |
if self.pos == *p { | |
return Some(*p); | |
} | |
} | |
None | |
} | |
} | |
fn main() { | |
let s = S { v: vec![1, 2, 3, 2] }; | |
println!("{:?}", s); | |
for v in s.objects_at(2) { | |
println!("{}", v); | |
} | |
println!("{:?}", s); | |
} |
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