How to confirm an async message was sent?

[sweihub]

Hi Dear Author

the websocketpp::send is an async interface that will sumit the send request to outgoing queue, How do I confirm when the message was sent, is there any on_send callback?

I have a scenario that the message was failed to send due to connection broken, I need to confirm a message was sent either successfully or failed.

Thanks

[Jacob-Burckhardt]

It succeeded if this method returns 0.

websocketpp/websocketpp/connection.hpp

Line 629 in 1b11fd3

size_t get_buffered_amount() const;