# indexed-vector
A Rust library that implements vector container that can be indexed with specified function.

## Implemented Structs

- `HashIndexedVector` implements a simple indexed vector with `HashMap`
- `BTreeIndexedVector` implements an indexed vector with `BTreeMap`. It also supports range query.

## Example

```rust
use indexed_vector::{BTreeIndexedVector, HashIndexedVector, IndexedVector};

#[derive(Clone, Debug)]
struct User {
    name: String,
    age: u16,
}


fn main() {
    let users = vec![
        User {
            name: "Tom".to_owned(),
            age: 20,
        },
        User {
            name: "Jane".to_owned(),
            age: 20,
        },
        User {
            name: "Ivan".to_owned(),
            age: 30,
        },
    ];

    let hash_vec = HashIndexedVector::new(users.clone(), |user: &User| user.age);
    // Tom and Jane
    dbg!(hash_vec.search(&20).collect::<Vec<_>>());
    // Ivan
    dbg!(hash_vec.search(&30).collect::<Vec<_>>());

    let btree_vec = BTreeIndexedVector::new(users, |user: &User| user.age);
    // Tom, Jane and Ivan
    dbg!(btree_vec.search_range(10..40).collect::<Vec<_>>());
}
```