Function frunk::semigroup::combine_all_option [−][src]
pub fn combine_all_option<T>(xs: &[T]) -> Option<T> where
T: Semigroup + Clone,
Given a sequence of xs
, combine them and return the total
If the sequence is empty, returns None. Otherwise, returns Some(total).
Examples
use frunk::semigroup::combine_all_option; let v1 = &vec![1, 2, 3]; assert_eq!(combine_all_option(v1), Some(6)); let v2: Vec<i16> = Vec::new(); // empty! assert_eq!(combine_all_option(&v2), None);Run