iptrie

This crate implements tries dedicated to IP addresses and prefixes lookup.

It provides sets and maps for Ipv4, Ipv6 and both mixed.

Each structure exists in two versions: * a first one based on Patricia trie which can be viewed as a standard map or set
with a lookup operation for finding the longest prefix match * a compressed one based one Level-Compressed trie (LC-Trie), optimized for lookup operation (longest prefix match) but which can’t be modified (planned to do in next releases)

Example

```rust fn main() { let prefixes = [ "1.1.0.0/24", "1.1.1.0/24", "1.1.0.0/20", "1.1.2.0/24" ];

let iter = prefixes.iter().map(|x| x.parse::<Ipv4Prefix>().unwrap());

// a set based on Patricia trie
let trie = Ipv4RTrieSet::from_iter(iter);

// lpm lookup for Ipv4 address
assert_eq!(trie.lookup(&"1.1.1.2".parse::<Ipv4Addr>().unwrap()).to_string(), "1.1.1.0/24");
assert_eq!(trie.lookup(&"1.1.2.2".parse::<Ipv4Addr>().unwrap()).to_string(), "1.1.0.0/20");

// lpm lookup for Ipv4 prefix also works
assert_eq!(trie.lookup(&"1.1.0.0/25".parse::<Ipv4Prefix>().unwrap()).to_string(), "1.1.0.0/24");
assert_eq!(trie.lookup(&"1.1.0.0/21".parse::<Ipv4Prefix>().unwrap()).to_string(), "1.1.0.0/20");


// now, compute the set based on LC-trie
let lctrie = trie.compress();

// lpm lookup for Ipv4 address
assert_eq!(lctrie.lookup(&"1.1.1.2".parse::<Ipv4Addr>().unwrap()).to_string(), "1.1.1.0/24");
assert_eq!(lctrie.lookup(&"1.1.2.2".parse::<Ipv4Addr>().unwrap()).to_string(), "1.1.0.0/20");

// lpm lookup for Ipv4 prefix also works
assert_eq!(lctrie.lookup(&"1.1.0.0/25".parse::<Ipv4Prefix>().unwrap()).to_string(), "1.1.0.0/24");
assert_eq!(lctrie.lookup(&"1.1.0.0/21".parse::<Ipv4Prefix>().unwrap()).to_string(), "1.1.0.0/20");

} ```