#pragma once #include "TileBehavior.h" class NullTileBehavior : public TileBehavior { public: virtual void update(Tile &); virtual std::unique_ptr clone(Museum &); static constexpr const char * type = ""; private: using TileBehavior::TileBehavior; static NullTileBehavior instance; NullTileBehavior() = default; };