Struct OrdContext 

pub struct OrdContext<T> {
    pub compare: fn(&T, &T) -> Ordering,
}

A context providing a custom comparison function.

When used with WithContext, implements PartialEq, Eq, PartialOrd, and Ord by dispatching through the stored comparator.

Examples

use context_trait::{WithContext, OrdContext};

// Sort in reverse order
let ctx = OrdContext { compare: |a: &i32, b: &i32| b.cmp(a) };
let mut items: Vec<_> = [3, 1, 2].iter()
    .map(|&v| WithContext { inner: v, ctx })
    .collect();
items.sort();
let values: Vec<i32> = items.into_iter().map(|w| w.inner).collect();
assert_eq!(values, vec![3, 2, 1]);

Fields

compare: fn(&T, &T) -> Ordering

The comparison function.

Trait Implementations

impl<T> Clone for OrdContext<T>

fn clone(&self) -> OrdContext<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T> Debug for OrdContext<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<T> Copy for OrdContext<T>