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struct player_mover {
public:
	void read(key); // pushes a new direction
	void map(key, sob::cell); // maps a key to a direction
	sob::cell operator()(const sob::cell& pos) {
		if (direction_queue.empty()) return pos;
 
		auto new_pos = pos + direction_queue.front();
		direction_queue.pop_front();
		return new_pos;
	}
private:
	std::deque<sob::cell> direction_queue;
};

prog.cpp:3:12: error: ‘key’ has not been declared
  void read(key); // pushes a new direction
            ^
prog.cpp:4:11: error: ‘key’ has not been declared
  void map(key, sob::cell); // maps a key to a direction
           ^
prog.cpp:4:16: error: ‘sob’ has not been declared
  void map(key, sob::cell); // maps a key to a direction
                ^
prog.cpp:5:2: error: ‘sob’ does not name a type
  sob::cell operator()(const sob::cell& pos) {
  ^
prog.cpp:13:2: error: ‘deque’ in namespace ‘std’ does not name a type
  std::deque<sob::cell> direction_queue;
  ^

Standard output is empty