struct Counter {
count: u8,
}
impl Counter {
fn new() -> Self {
Self { count: 0 }
}
}
impl Iterator for Counter {
type Item = u8;
fn next(&mut self) -> Option<Self::Item> {
self.count += 1;
if self.count < 6 {
Some(self.count)
} else {
None
}
}
}
fn main() {
// using this custom iterator
let mut c: Counter = Counter::new();
for el in c.into_iter() {
println!("c.next: {:?}", el);
}
use std::ffi::OsStr;
// path
let path = ::std::path::Path::new("C:/Users/JimB/Downloads/Fedora.iso");
// path iterator
let mut iterator: std::path::Iter = path.iter();
// first element
assert_eq!(iterator.next(), Some(OsStr::new("C:")));
// other elements, but the first
for el in iterator {
println!("it.next: {:?}", el);
}
// into_iter
use std::collections::BTreeSet;
let mut favorites = BTreeSet::new();
favorites.insert("Lucy in the Sky With Diamonds".to_string());
favorites.insert("Liebesträume No. 3".to_string());
let mut it = favorites.into_iter();
assert_eq!(it.next(), Some("Liebesträume No. 3".to_string()));
assert_eq!(it.next(), Some("Lucy in the Sky With Diamonds".to_string()));
assert_eq!(it.next(), None);
}
