| #![feature(no_core)] |
| #![no_core] |
| |
| #![feature(lang_items)] |
| |
| #[lang = "sized"] |
| pub trait Sized { |
| // Empty. |
| } |
| |
| #[lang = "fn_once"] |
| pub trait FnOnce<Args> { |
| /// The returned type after the call operator is used. |
| #[lang = "fn_once_output"] |
| type Output; |
| |
| /// Performs the call operation. |
| extern "rust-call" fn call_once(self, args: Args) -> Self::Output; |
| } |
| |
| pub enum Ordering { |
| /// An ordering where a compared value is less than another. |
| Less = -1, |
| /// An ordering where a compared value is equal to another. |
| Equal = 0, |
| /// An ordering where a compared value is greater than another. |
| Greater = 1, |
| } |
| |
| pub fn max_by<T, F: FnOnce(&T, &T) -> Ordering>(v1: T, v2: T, compare: F) -> T { |
| match compare(&v1, &v2) { |
| Ordering::Less | Ordering::Equal => v2, |
| Ordering::Greater => v1, |
| } |
| } |
| |
| pub fn min_by<T, F: FnOnce(&T, &T) -> Ordering>(v1: T, v2: T, compare: F) -> T { |
| match compare(&v1, &v2) { |
| Ordering::Less | Ordering::Equal => v1, |
| Ordering::Greater => v2, |
| } |
| } |
