iptrie 0.7.0

IPv4/v6 prefixes lookup structures (based on tries)
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# iptrie

[![Crates.io](https://img.shields.io/crates/v/iptrie?style=flat)](https://crates.io/crates/iptrie)
[![Crates.io](https://img.shields.io/crates/d/iptrie?style=flat)](https://crates.io/crates/iptrie)
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[![Docs](https://img.shields.io/docsrs/iptrie)](https://docs.rs/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");
}
```