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use super::Netv4Addr; use crate::traits::Merge; use core::cmp::Ordering; use std::net::Ipv4Addr; impl Merge for Netv4Addr { type Output = Option<Self>; fn merge(&self, other: &Self) -> Self::Output { let addr: u32 = self.addr().clone().into(); let mask: u32 = self.mask().clone().into(); let other_addr: u32 = other.addr().clone().into(); let other_mask: u32 = other.mask().clone().into(); let mask: u32 = match mask.cmp(&other_mask) { Ordering::Equal => mask << 1, Ordering::Less => mask, Ordering::Greater => other_mask, }; if addr & mask == other_addr & mask { Some(Self::new(Ipv4Addr::from(addr & mask), Ipv4Addr::from(mask))) } else { None } } } #[cfg(test)] mod tests { use super::*; #[test] fn mergeable_networks_correct() { let a: Netv4Addr = "10.0.0.0/24".parse().unwrap(); let b: Netv4Addr = "10.0.1.0/24".parse().unwrap(); assert_eq!(a.merge(&b), Some("10.0.0.0/23".parse().unwrap())); } #[test] fn mergeable_networks_reflexive() { let a: Netv4Addr = "10.0.0.0/24".parse().unwrap(); let b: Netv4Addr = "10.0.1.0/24".parse().unwrap(); assert_eq!(a.merge(&b), b.merge(&a)); } #[test] fn nested_networks_takes_biggest() { let a: Netv4Addr = "10.0.0.0/24".parse().unwrap(); let b: Netv4Addr = "10.0.0.0/23".parse().unwrap(); assert_eq!(a.merge(&b), Some(b)); } #[test] fn nested_networks_reflexive() { let a: Netv4Addr = "10.0.0.0/24".parse().unwrap(); let b: Netv4Addr = "10.0.0.0/23".parse().unwrap(); assert_eq!(a.merge(&b), b.merge(&a)); } #[test] fn adjacent_but_not_mergable_none() { let a: Netv4Addr = "10.0.1.0/24".parse().unwrap(); let b: Netv4Addr = "10.0.2.0/24".parse().unwrap(); assert_eq!(a.merge(&b), None); assert_eq!(b.merge(&a), None); assert_eq!(a.merge(&b), b.merge(&a)); } }