Live C++ coding: Applying threadsafe::ObjectTracker to cppgraphviz. смотреть онлайн

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I successfully make a tracker for threadsafe (Unlocked) objects.
That means this: an object that wraps some class and a mutex (which can be read/write mutex) making it impossible to access that class without locking the mutex, enforced by the API (this is what https://github.com/CarloWood/threadsafe has been doing since 2015) but now this is combined with an object tracker: at the moment the above wrapper is constructed also a tracker is constructed and placed on the heap. Other threads can get access to this tracker through a std::weak_ptr (while the wrapper class has a shared_ptr to it). Whenever the wrapper is moved, the tracker is updated to point to the new location, all in a thread-safe way.

However, now that I tried to apply this new API to cppgraphviz I run into a problem that I had to workaround before (and thus thought it was fixed): during construction of one of the objects the compiler complains that a certain class is incomplete. This appears to be caused by a "circular" dependency of the template classes involved. All in all, very very difficult stuff to understand and fix :/.

Continuation of:
Back to cppgraphviz - I need to make it threadsafe still.
Everything compiles and works right now (finished it yesterday off-stream). Today I'll
1) check if there is anything left in classes in namespace dot that isn't protected by a mutex yet.
2) find all members of classes in namespace cppgraphviz that need to be make threadsafe.