#heterogeneous #bag #collection #hashmap

baggie

Container for storing mixed / heterogeneous values in a common structure

3 unstable releases

✓ Uses Rust 2018 edition

0.2.1 Dec 24, 2018
0.2.0 Dec 24, 2018
0.1.0 Dec 23, 2018

#4 in #heterogeneous

22 downloads per month
Used in 1 crate

MIT license

7KB
60 lines

baggie


Build Status crates.io Coverage Status

Baggie is simple interface for storing any type of element in a HashMap. The crate has no dependencies, and is really just a helper around storing and fetching Anys from a HashMap. It has no unsafe code and free of any unwraps or similar misgivings.

The Baggie implements a subset of methods found in HashMap.

The downside of this crate is you must know the type of what you stored later on. Typically this shouldn't be a problem, as you could keep some metadata structure describing what types belong to what keys you've stored.

Sometimes you might need a tool like this, but most times you should be using an enum. :)

use baggie::Baggie;

let mut bag = Baggie::new();

// Insert any value type you wish...
bag.insert("key1", "Value1".to_owned());
bag.insert("key2", vec!["value", "2"]);
bag.insert("key3", 3);

// Get a reference
let val3 = bag.get::<i32, _>("key3");
assert_eq!(Some(&3), val3);

// Get a mutable reference
let val2: Option<&mut Vec<&str>> = bag.get_mut("key2");
match val2 {
    Some(v) => *v = vec!["new", "value", "2"],
    None => panic!()
}
let val2: &mut Vec<&str> = bag.get_mut("key2").unwrap();
assert_eq!(val2, &mut vec!["new", "value", "2"]);

No runtime deps