OrdBy

Conveniently attach a custom compare function to any type, to get sort_by() type behavior from types like BinaryHeap

OrdBy is a generalization of the pattern used by [Reverse].

```rust use std::collections::BinaryHeap; use ord_by::*;

let numbers = vec![0, 2, 4, 6, 8, 1, 3, 5, 7, 9]; let mut heap = BinaryHeap::with_capacity(10);

numbers.intoiter().ordby(|a, b| a.cmp(b)) .for_each(|n| heap.push(n));

let mut sorted = Vec::withcapacity(10); while let Some(n) = heap.pop() { sorted.push(n.intoinner()) }

assert_eq!(sorted, vec![9, 8, 7, 6, 5, 4, 3, 2, 1, 0]) ```

Future Work: I would like the compare function to be a single associated constant for efficiency, rather than being a variable stored with each struct instance. However that requires associated constants that can have a type dependent on generics, which is currently an unsupported feature. https://github.com/rust-lang/rust/issues/98210