Crate cmp_wrap

Have you ever needed to compare the same data by different fields, depending on context? If so, this crate is for you!

Example

Using context

You probably have some kind of context in which you would like to compare your values, such as length of vectors or the first value.

use cmp_wrap::KeyCmpContext;

let by_length = KeyCmpContext::new(&|v: &Vec<_>| v.len());

let long_vec = by_length.wrap(vec![1,2,3,4]);
let short_vec = by_length.wrap(vec![1,2]);

assert!(long_vec > short_vec, "The vec {:?} is longer then {:?}", long_vec, short_vec);

By direct creation

you can define the key function on a "case by case" basis.

use cmp_wrap::CmpByKey;

let len_as_key = |v: &Vec<_>| v.len();

let long_vec = CmpByKey::new(vec![1,2,3,4], &len_as_key);
let short_vec = CmpByKey::new(vec![1,2], &len_as_key);

assert!(long_vec > short_vec, "The vector {:?} is longer then {:?}", long_vec, short_vec);

Structs

CmpByKey	The main structure of this crate. Lets you define a "key function" over any structure, which will change the way the value is being compared. Very useful when you need to enter your data to different data structures (such as max heaps, sorted trees and so on), with different comparision criteria.
KeyCmpContext	Used to easily wrap multiple values with the same key function.

Type Definitions

KeyFunction