Method notAssigned

fdbserver/StorageCache.actor.cpp:117–117

	bool isReadable() const { return readWrite != nullptr; }
	bool isAdding() const { return adding != nullptr; }
	bool notAssigned() const { return !readWrite && !adding; }
	bool assigned() const { return readWrite || adding; }
	bool isInVersionedData() const { return readWrite || (adding && adding->isTransferred()); }
	void addMutation(Version version, MutationRef const& mutation);