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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