address 0.20.0-rc.3

Network address types with strict validation, owned & borrowed variants, and standard library conversions.
Documentation 
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use crate::{Host, HostRef};
use std::fmt::{Debug, Display, Formatter};

impl Debug for Host {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        Display::fmt(self, f)
    }
}

impl Display for Host {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        Display::fmt(&self.to_ref(), f)
    }
}

impl<'a> Debug for HostRef<'a> {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        Display::fmt(self, f)
    }
}

impl<'a> Display for HostRef<'a> {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::Name(domain) => Display::fmt(domain, f),
            Self::Address(ip) => Display::fmt(ip, f),
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::{Domain, Host, IPv4Address, IPv6Address};

    #[test]
    fn display() {
        let test_cases: &[(Host, &str)] = &[
            (Domain::localhost().to_host(), "localhost"),
            (IPv4Address::LOCALHOST.to_host(), "127.0.0.1"),
            (IPv6Address::LOCALHOST.to_host(), "::1"),
        ];

        for (host, expected) in test_cases {
            let result: String = host.to_string();
            assert_eq!(result, *expected, "host={:?}", host);
        }
    }

    #[test]
    fn display_spec() {
        let host: Host = Domain::localhost().to_host();
        assert_eq!(format!("{:>12}", host), "   localhost");
        assert_eq!(format!("{:.5}", host), "local");

        let host: Host = IPv4Address::LOCALHOST.to_host();
        assert_eq!(format!("{:>12}", host), "   127.0.0.1");
        assert_eq!(format!("{:.3}", host), "127");
    }
}