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Ok thanks. The example with handle_connect() is just one out of many btw: in 
general, don't run code after push() which uses or assumes data which 
handle_error() cleans up.

There are indeed cases in which initiate_send() in a push() is practical. Aside 
from throughput issues, sending heartbeat messages or streaming data from 
another thread using a timer doesn't work without initiate_send, because the 
data wouldn't be sent until select() in the main thread feels like returning.