Here's a draft README for your Rust implementation of LevelDB's SkipList:

Rust SkipList

A Rust implementation of the SkipList data structure, inspired by LevelDB's SkipList. This project provides a concurrent, lock-free SkipList implementation that can be used for efficient key-value storage and retrieval.

Features

Lock-free concurrent operations
Efficient insertion and lookup
Iterator support for traversal
Configurable maximum height and branching factor
Written in safe Rust with minimal unsafe code

Usage

Add this to your Cargo.toml:

[dependencies]
skiplist-rust = "0.1.0"

Then you can use the SkipList in your Rust code:

use skiplist_rust::SkipList;

fn main() {
    let mut list = SkipList::new();

    // Insert some values
    list.insert(5);
    list.insert(2);
    list.insert(8);

    // Check if a value exists
    assert!(list.contains(&5));
    assert!(!list.contains(&3));

    // Iterate over the list
    let mut iter = SkipListIterator::new(&list);
    while iter.valid() {
        println!("Key: {}", iter.key());
        iter.next();
    }
}

API

`SkipList<K>`

new() -> SkipList<K>: Create a new SkipList
insert(key: K): Insert a key into the SkipList
contains(&key: &K) -> bool: Check if a key exists in the SkipList
iter(&self) -> SkipListIterator<K>: Get an iterator over the SkipList

`SkipListIterator<K>`

new(list: &SkipList<K>) -> SkipListIterator<K>: Create a new iterator over a SkipList
valid(&self) -> bool: Check if the iterator is pointing to a valid node
key(&self) -> &K: Get the key of the current node
next(&mut self): Move to the next node
prev(&mut self): Move to the previous node
seek(&mut self, target: &K): Seek to the first node with a key >= target
seek_to_first(&mut self): Seek to the first node
seek_to_last(&mut self): Seek to the last node

Performance

This implementation aims to provide similar performance characteristics to LevelDB's SkipList. It uses atomic operations for concurrent access and a similar probabilistic balancing strategy.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License.

Acknowledgments

Inspired by LevelDB's SkipList implementation
Built with Rust's powerful type system and memory safety guarantees

skiplist-rust 0.1.0