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LfIter for &&str iter
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const PLF: &'static &'static str = &"\n"; | |
struct LfIter<I> where I: Iterator { | |
iter: I, | |
lf_every: u32, | |
items: u32 | |
} | |
impl<I> LfIter<I> where I: Iterator { | |
fn new(iter: I, lf_every: u32) -> LfIter<I> { | |
LfIter { | |
iter: iter, | |
lf_every: lf_every, | |
items: 0 | |
} | |
} | |
} | |
impl<'i, I> Iterator for LfIter<I> where I: Iterator<Item=&'i &'i str> { | |
type Item = &'i &'i str; | |
fn next(&mut self) -> Option<Self::Item> { | |
if self.items >= self.lf_every { | |
self.items = 0; | |
Some(PLF) | |
} else { | |
self.items = self.items + 1; | |
self.iter.next() | |
} | |
} | |
} | |
fn main() { | |
let d = ["A", "B", "C", "D", "E", "F", "G"]; | |
let lf_iter = LfIter::new(d.iter(), 3); | |
for l in lf_iter { | |
print!("{}", l); | |
} | |
} |
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