The c++ qpid::messaging client also maps the subject onto the routing
key in the case of sending to an exchange[1], and additionally always
sets the qpid.subject application-property.
The subject can be specified when creating the sender using the address
(e.g. my-topic/my-subject), but can also be overridden per-message using
the Message::setSubject() method.
[1] Messages sent 'directly' to a queue - i.e. to the default exchange
in 0-10 terms - must have a routing key set to the queue's name which is
why the subject is not used in that case. The qpid.subject property will
still be set.
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