42 lines
890 B
Rust
42 lines
890 B
Rust
fn iter_empty_and_zst() {
|
|
// Iterate over a Unique::empty()
|
|
for _ in Vec::<u32>::new().iter() {
|
|
panic!("We should never be here.");
|
|
}
|
|
|
|
// Iterate over a ZST (uses arith_offset internally)
|
|
let mut count = 0;
|
|
for _ in &[(), (), ()] {
|
|
count += 1;
|
|
}
|
|
assert_eq!(count, 3);
|
|
}
|
|
|
|
fn test_iterator_step_by_nth() {
|
|
let mut it = (0..16).step_by(5);
|
|
assert_eq!(it.nth(0), Some(0));
|
|
assert_eq!(it.nth(0), Some(5));
|
|
assert_eq!(it.nth(0), Some(10));
|
|
assert_eq!(it.nth(0), Some(15));
|
|
assert_eq!(it.nth(0), None);
|
|
}
|
|
|
|
fn iter_any() {
|
|
let f = |x: &u8| 10u8 == *x;
|
|
f(&1u8);
|
|
|
|
let g = |(), x: &u8| 10u8 == *x;
|
|
g((), &1u8);
|
|
|
|
let h = |(), (), x: &u8| 10u8 == *x;
|
|
h((), (), &1u8);
|
|
|
|
[1, 2, 3u8].iter().any(|elt| 10 == *elt);
|
|
}
|
|
|
|
fn main() {
|
|
test_iterator_step_by_nth();
|
|
iter_any();
|
|
iter_empty_and_zst();
|
|
}
|