Method clear

src/QLContext.actor.cpp:583–583

	virtual void set(StringRef key, ValueRef value) { layers->set(tr, DataKey(prefix).append(key), value); }
	virtual void clearDescendants() { layers->clearDescendants(tr, prefix); }
	virtual void clear(StringRef key) { layers->clear(tr, DataKey(prefix).append(key)); }
	virtual void clearRoot() { layers->clear(tr, prefix); }

	DataKey prefix;