Compiler error if used with QT6 (Syntax error)

[mfranzen0906]

In my application, I need to use QT6 and cyclonedds.
When I used QT5 it compiled just fine.

But now that I have to migrate to QT6, I am getting compiler errors for the TopicInstaceImpl.hpp:

ddscxx\dds/topic/detail/TopicInstanceImpl.hpp(42,34): error C2760: Syntax error: "::" was not expected here, but "ID-expression".

Is this a known problem? When I edit the file locally and remove all the :: before each dds::core::..., it seems to compile just fine. Would it be a problem to add this change?

[mfranzen0906]

@eboasson I also have another topic that I would like to discuss. Can we write via Discord? User: marcelf.9705

[eboasson]

It is quite a mixed bag of ::dds::... and dds::... throughout the header files and the code. Perhaps there was a reason for that (and then dropping the initial :: here is perhaps unwise), perhaps there was no reason at all (and then I'm fine dropping them, and perhapings dropping them everywhere).

@e-hndrks do you happen to know why it was done like this?

[eboasson]

As far as I can tell, it is actually better to use ::dds::... and the code is valid C++. So what I am struggling with is why it becomes a problem when using Qt6, and why only the ones in TopicInstanceImpl.hpp are a problem. From the error message, I get the impression this is the visual studio compiler, and so one would almost think that Qt6 is defining some macro that breaks things.

Could you do me a favour and try to find out a bit more about why it fails with Qt6?

[mfranzen0906]

@eboasson Yes that seems strange to me too. Why is it better though?
I can try to find out more but all my recent attempts did not reveal new infos.