max_by in std::cmp - Rust (original) (raw)

Function max_by

1.53.0 · Source

pub fn max_by<T, F>(v1: T, v2: T, compare: F) -> T

where
    F: FnOnce(&T, &T) -> Ordering,

Expand description

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;

let abs_cmp = |x: &i32, y: &i32| x.abs().cmp(&y.abs());

let result = cmp::max_by(3, -2, abs_cmp) ;
assert_eq!(result, 3);

let result = cmp::max_by(1, -2, abs_cmp);
assert_eq!(result, -2);

let result = cmp::max_by(1, -1, abs_cmp);
assert_eq!(result, -1);