[PROTON-1287] c++: missing empty() method on message_id and annotation_key

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: proton-0.14.0
• Fix Version/s: proton-0.15.0
• Component/s: cpp-binding
• Assignee: Alan Conway
• Reporter: Alan Conway
• Created: 23/Aug/16 15:28
• Updated: 08/Feb/17 19:06
• Resolved: 26/Aug/16 20:01

Description

The restricted scalar types message_id and annotation_key do not have an empty() method. This is needed because they can be absent on a message.

It was also noted that both value and scalar type() and empty() methods are inherited (publicly) from internal classes, which makes it unclear if they part of the API and means doxygen does not document them.

Fix this.