Hey, I'm handling concurrency with message passing, previously
with D's concurrency, now with Vibe-d, which I assume works the
same way.
My app is a chat server, and when a connection is opened to a
client, I store the Tid of the thread (or fibre?) handling
sending messages out to the client. This lets me broadcast
messages to all Tids. When a connection is closed, the thread
requests that its Tid is removed from the list.
Both adding and removing the Tid technically require only the Tid
to be message passed. However, I would like to distinguish
between the two cases. I currently have two empty structs named
AddTid and RemoveTid, and I pass those along. I assume some bytes
must be passed in their place to tell of their type, but that's
fine.
It does feel rather hacked, however. I'm aware that D doesn't
support excessively fancy pattern matching, like what is found in
SML, but is there a more correct way to do this? Enums don't
work, because they have the same type. I can pattern match the
enums later, but I want to do it immediately.
- Message passing pattern matching Casper Færgemand
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