# key-node-list [github](https://github.com/MaxXSoft/key-node-list) [crates.io](https://crates.io/crates/key-node-list) [docs.rs](https://docs.rs/key-node-list) [build status](https://github.com/MaxXSoft/key-node-list/actions?query=branch%3Amaster) Doubly-linked list that stores key-node pairs. `KeyNodeList` is a doubly-linked list, it uses a hash map to maintain correspondence between keys and nodes, and records the previous key and the next key of the current node in the node itself. There is no pointer operations during this process, so `key_node_list` is all implemented in safe Rust. You can complete key lookups, key-node pair updates, key-node pair deletions and other operations of `KeyNodeList` in *O*(1)~ time. You can also use cursor-based interface to traverse or edit the linked list. ## Usage [`key_node_list` is available on crates.io](https://crates.io/crates/key-node-list): ``` cargo add key-node-list ``` ## Example ```rust use key_node_list::KeyValueList; // construct key-value list from tuple array let mut list = KeyValueList::from([(1, "Reimu"), (2, "Marisa")]); // or pushing other key-value pairs to the front/back of list list.push_front(0, "Alice").unwrap(); list.push_back(3, "Patchouli").unwrap(); // query nodes by key assert_eq!(list[&1].value(), &"Reimu"); assert_eq!(list[&0].value(), &"Alice"); // also you can update nodes by key *list.node_mut(&3).unwrap().value_mut() = "Youmu"; *list.front_node_mut().unwrap().value_mut() = "Mokou"; assert_eq!(list[&3].value(), &"Youmu"); assert_eq!(list[&0].value(), &"Mokou"); assert_eq!(list.front_node().unwrap().value(), &"Mokou"); // remove some key-node pairs assert!(list.pop_front().is_some()); assert!(list.remove(&2).is_some()); // all key-node pairs are in order list.push_back(5, "Yuyuko"); let vec: Vec<_> = list.into_iter().map(|(k, n)| (k, n.into_value())).collect(); assert_eq!(vec, [(1, "Reimu"), (3, "Youmu"), (5, "Yuyuko")]); ``` For more details, visit [`key_node_list` on docs.rs](https://docs.rs/key-node-list). ## Changelog See [CHANGELOG.md](CHANGELOG.md). ## License Copyright (C) 2010-2023 MaxXing. License GPLv3.