Function classific::at_greatest

pub fn at_greatest<T, F>(is_at_greatest: F) -> AtGreatest<T, F> where
    T: ?Sized,
    F: Fn(&T) -> bool, 

This function returns a Comparator for T which divides T instances into 2 categories.

• the ones for which is_at_least returns true: these are considered Ordering::Less than the other category, and Ordering::Equal to each other
• and the ones for which is_at_least returns false: these are considered Ordering::Greater than the other category, and Ordering::Equal to each other

See at_least and partial_order_or.

Examples

use std::cmp::Ordering;
use classific::{Comparator, at_greatest, partial_order_or};

assert_eq!(partial_order_or(at_greatest(|f: &f64| f.is_nan())).cmp(&f64::NAN, &1_f64), Ordering::Greater);
assert_eq!(partial_order_or(at_greatest(|f: &f64| f.is_nan())).cmp(&f64::NAN, &f64::NAN), Ordering::Equal);
assert_eq!(partial_order_or(at_greatest(|f: &f64| f.is_nan())).cmp(&1_f64, &f64::NAN), Ordering::Less);