[−][src]Function classific::comparing_ref
pub fn comparing_ref<S, T: ?Sized, F>(map: F) -> ComparingRef<S, T, F> where
S: ?Sized,
T: Ord,
F: Fn(&S) -> &T,
This function returns a Comparator
for S
which first maps values to &T
then compare them with Ord::cmp
.
Examples
use std::cmp::Ordering; use classific::{Comparator, comparing_ref}; assert_eq!(comparing_ref(|t: &(i8, i8)| &t.1).cmp(&(3, 1), &(2, 2)), Ordering::Less);