Follow-up from #2191525-29: [PP-1][policy, no patch] Extend Markdown coding standards to support API module (DOXYGEN) → .
@addtogroup means "add the following things inside a @{ @} to the group/topic", so without the {} it is meaningless.
Technically speaking, the API module treats both @ingroup and @addtogroup the same (source).
The actual interpretation of the @addtogroup syntax is far different from the current DOXYGEN spec: https://www.stack.nl/~dimitri/doxygen/manual/commands.html#cmdaddtogroup
How I read that is basically that it should behave just like if you were to use both @defgroup and @ingroup together (e.g. subtopics). This would actually eliminate the need for having to use both (which we're currently doing). That really sounds like a separate issue for the API module though. For now, I'd rather just leave it as part of this issue/proposed policy since it exists in the current grouping mechanisms → already in place.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
https://www.stack.nl/~dimitri/doxygen/manual/commands.html#cmdaddtogroup returns a 404 error. The issue summary should be updated to include a working link.
Updated the link, and added link to 'ingroup'.
Is there any interest in pursuing this?