basically it's a class called LockBox<C> that holds an instance of C which is inaccessible, unless you use the Unlocker<C> class like so:
*pass box around to different threads*
*later in some thread*
and it's thread safe C:
there is a wrinkle because there is no copy constructor since std::mutex has no copy constructor, but you could potentially get around this by wrapping the mutex in a std::shared_ptr
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