On 6/04/2017 10:14, Christopher Pisz via Boost-users wrote:
What if the server wants to send "Hello" to all clients every 5 minutes?
You need a collection. If you have a collection, then you maintain a
reference count when using shared_ptrs, and just killed the tutorials
lifetime management scheme. In the end, you need to know when it is safe to
remove the connection from a collection and destroy it.
Make a collection of weak_ptrs. When you go through and try to send to them, some of them will have expired, and you can remove them from the collection then. The rest are still alive (although some might error out when you try to send to them, due to the way TCP works; if that happens you can just close() them and they'll be expired the next time you check).
If you want to explicitly disconnect a given connection, you simply need to call shutdown() and close() on it (via a method on your connection class), which will abort the pending receive and release the internal references, so once you discard the local shared_ptr you just used to close it then the connection object will be destroyed automatically.
(Note that it's not safe to assume you can destroy the object immediately after calling close() on the socket -- if the receive was still pending, it still needs to call the completion handler with the error, which might happen later on a different thread. This is why using shared_ptr is the preferred solution as it handles different lifetime ordering correctly without explicit locking.)
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