Function std::cmp::max_by

pub fn max_by<T, F>(v1: T, v2: T, compare: F) -> T where
    F: for<'_, '_> FnOnce(&T, &T) -> Ordering, 

Returns the maximum of two values with respect to the specified comparison function.

Returns the second argument if the comparison determines them to be equal.

Examples

use std::cmp;

assert_eq!(cmp::max_by(-2, 1, |x: &i32, y: &i32| x.abs().cmp(&y.abs())), -2);
assert_eq!(cmp::max_by(-2, 2, |x: &i32, y: &i32| x.abs().cmp(&y.abs())), 2);