This is a multimap implementation for Rust. Implemented as a thin wrapper around std::collections::HashMap.

extern crate multimap;

use multimap::MultiMap;

fn main () {
    let mut map = MultiMap::new();

    map.insert("key1", 42);
    map.insert("key1", 1337);
    map.insert("key2", 2332);

    assert_eq!(map["key1"], 42);
    assert_eq!(map.get("key1"), Some(&42));
    assert_eq!(map.get_vec("key1"), Some(&vec![42, 1337]));
}

• Added FromIterator<(K, Vec<V>)> #48.

• Fixes a bug where iteration would panic on empty (inner) vectors #46.

• Added flat_iter and flat_iter_mut
• Fixed bug where get and get_mut could panic.

• multimap! macro fixes; allow trailing comma, naming hygiene and create with enough capacity for all elements.

• Added #![forbid(unsafe_code)].

• Fixed wrong link to documentation in Cargo.toml.

• Added MultiMap::insert_many.
• Added MultiMap::insert_many_from_slice.

• Added possibility to replace the default hasher for the underlying HashMap.
• Fix build warning by removing an unnecessary mut.

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT) at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.