Blackboard lookup

[Serafadam]

I think it would be a nice addition if there was a view of currently present Blackboard variables & their values. Or maybe that is implemented and I haven't seen that? I guess it's just a simple case of getting tree.blackboard_stack and printing its contents.

[facontidavide]

I am tempted to say that it is impossible, but let's just say it is very hard to implement:

Groot and the BT.CPP executor are lously coupled and communicate over flatbuffer.

You change would involve a new flatbuffer protocol that include that. And about the values, do not forget that ANY C++ type is allowed.

Even if I serialize that, how can I make a user defined C++ type visible in Groot? I can not.

So, no, this will not happen, sorry.

[facontidavide]

we may of course limit the scope to only types that are strings or can be converted to string (line numbers). That would be very limiting, but better than nothing.

Still a lot of work that I have no time to do, unfortunately.

[Serafadam]

Would there be a way to make a mechanism that allows easy adding of such types? I haven't worked with flatbuffer, but won't creating schemas or using https://google.github.io/flatbuffers/flexbuffers.html help? Also if a custom type had an overloaded << operator for string representation, would that help?

[facontidavide]

you are welcome to do that and send a PullRequest :)

It is a huge amount of work that I don't have time for further development of Groot right now.