varmap 0.1.0

Fast, heterogeneous key-value maps for Rust. Store mixed types (integers, strings, bytes, custom structs) under a single key namespace, with compile-time keys, runtime strings, or enum variants. Arena-backed for zero-copy reads of strings and byte slices.
Documentation 
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use crate::*;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};

impl VarMapValue for Ipv4Addr {
    type Decoded<'a> = Ipv4Addr;
    const TYPE_ID: u32 = 0;

    fn to_value<'a>(&self, builder: &'a mut ValueBuilder<'a>) -> Value<'a> {
        Value::new(ValueKind::IpV4(*self), builder.arena())
    }
    fn from_value<'a>(value: &'a Value<'a>) -> Option<Ipv4Addr> {
        <Self as VarMapStoredValue>::from_stored(value.kind(), value.arena())
    }
}
impl VarMapStoredValue for Ipv4Addr {
    fn from_stored<'a>(kind: &'a ValueKind, _arena: &'a Arena) -> Option<Ipv4Addr> {
        match kind {
            ValueKind::IpV4(ip) => Some(*ip),
            _ => None,
        }
    }
}
impl VarMapValue for Ipv6Addr {
    type Decoded<'a> = Ipv6Addr;
    const TYPE_ID: u32 = 0;

    fn to_value<'a>(&self, builder: &'a mut ValueBuilder<'a>) -> Value<'a> {
        Value::new(
            ValueKind::Ipv6(builder.arena_mut().store(self.octets().as_slice(), MemAlign::Bits8)),
            builder.arena(),
        )
    }
    fn from_value<'a>(value: &'a Value<'a>) -> Option<Ipv6Addr> {
        <Self as VarMapStoredValue>::from_stored(value.kind(), value.arena())
    }
}
impl VarMapStoredValue for Ipv6Addr {
    fn from_stored<'a>(kind: &'a ValueKind, arena: &'a Arena) -> Option<Ipv6Addr> {
        match kind {
            ValueKind::Ipv6(index) => arena
                .get(*index)
                .map(|bytes| Ipv6Addr::from_octets(bytes.try_into().unwrap())),
            _ => None,
        }
    }
}

impl VarMapValue for IpAddr {
    type Decoded<'a> = IpAddr;
    const TYPE_ID: u32 = 0;

    fn to_value<'a>(&self, builder: &'a mut ValueBuilder<'a>) -> Value<'a> {
        match self {
            IpAddr::V4(ip) => Value::new(ValueKind::IpV4(*ip), builder.arena()),
            IpAddr::V6(ip) => Value::new(ValueKind::Ipv6(builder.arena_mut().store(ip.octets().as_slice(), MemAlign::Bits8)), builder.arena()),
        }
    }

    fn from_value<'a>(value: &'a Value<'a>) -> Option<IpAddr> {
        <Self as VarMapStoredValue>::from_stored(value.kind(), value.arena())
    }
}

impl VarMapStoredValue for IpAddr {
    fn from_stored<'a>(kind: &'a ValueKind, arena: &'a Arena) -> Option<IpAddr> {
        match kind {
            ValueKind::IpV4(ip) => Some(IpAddr::V4(*ip)),
            ValueKind::Ipv6(ip) => Some(IpAddr::V6(Ipv6Addr::from_octets(arena.get(*ip)?.try_into().unwrap()))),
            _ => None,
        }
    }
}