Struct OutboundAliases 

struct OutboundAliases {
    map: HashMap<TopicBuf, NonZeroU16>,
    next: NonZeroU16,
    max: u16,
}

Outbound topic alias map: assigns and tracks aliases for outgoing PUBLISH.

Fields

map: HashMap<TopicBuf, NonZeroU16>

topic → assigned alias

next: NonZeroU16

next alias to assign (1-based, up to max)

max: u16

server’s Topic Alias Maximum

Implementations

impl OutboundAliases

fn new(max: u16) -> Self

fn get_or_assign(&mut self, topic: &Topic) -> Option<(NonZeroU16, bool)>

Look up or assign an alias for the given topic.

Returns (alias, first_use). On first use the caller must include the full topic string alongside the alias; on subsequent uses the topic can be empty.