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pub fn pymod(a: isize, b: isize) -> isize {
let r = a % b;
// If r and b differ in sign, add b to wrap the result to the correct sign.
if (r > 0 && b < 0) || (r < 0 && b > 0) {
return r + b;
}
r
}
pub fn is_some_and_not_empty<T>(v: &Option<Vec<T>>) -> bool {
match v {
Some(v) => !v.is_empty(),
None => false,
}
}
pub fn includes<T>(v: &Vec<T>, el: &T) -> bool
where
T: PartialEq,
{
v.iter().any(|ve| ve == el)
}
pub fn not_empty<T>(v: &Vec<T>) -> bool {
!v.is_empty()
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn python_mod() {
assert_eq!(pymod(2, -3), -1);
assert_eq!(pymod(-2, 3), 1);
assert_eq!(pymod(-2, -3), -2);
assert_eq!(pymod(-3, -3), 0);
assert_eq!(pymod(3, 3), 0);
assert_eq!(pymod(2, 3), 2);
assert_eq!(pymod(4, 3), 1);
assert_eq!(pymod(3, 3), 0);
assert_eq!(pymod(6, 3), 0);
assert_eq!(pymod(-6, 3), 0);
assert_eq!(pymod(-6, -3), 0);
assert_eq!(pymod(6, -3), 0);
}
#[test]
fn includes_works() {
assert!(!includes(&vec![], &0));
assert!(includes(&vec![1], &1));
assert!(includes(&vec![1, 2, 3, 4], &3));
assert!(!includes(&vec![1, 2, 3, 4], &5));
}
#[test]
fn not_empty_works() {
assert!(!not_empty::<usize>(&vec![]));
assert!(not_empty(&vec![1]));
}
}
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