不能使用循环包含转发声明

我一直在寻找解决这个问题的方法已经有一段时间了，这里的每个答案都对不包括头文件有一些变化，但我似乎已经签约了愚蠢并且无法弄清楚......

我有C++类creature的基础，应该在ladybird和aphid中实现，但我不断收到expected class-name before ‘{’ token错误。

生物.h

#ifndef CREATURE_H_
#define CREATURE_H_
#include <iostream>
#include "board.h"
#include "cell.h"
class Creature {
  private:
    int x, y;
  protected:
    Creature(int x, int y);
  public:
    int getX();
    int getY();
    //virtual bool willMove() = 0;
    //virtual void doMove(Board *board) = 0;
    //std::ostream& operator<<(std::ostream &out, Creature &cCreature);
};
#endif

蚜虫：

#ifndef APHID_H_
#define APHID_H_
#include "creature.h"
class Aphid : public Creature {
  public:
    Aphid(int x, int y);
    static float moveProbability;
    static float killProbabllity;
    static float killModifier;
    static float matingProbability;
    //virtual bool willMove();
    //virtual void doMove(Board *board);
};
#endif

瓢虫：

#ifndef LADYBIRD_H_
#define LADYBIRD_H_
#include "creature.h"
class Ladybird : public Creature {
  public:
    Ladybird(int x, int y);
    static float moveProbability;
    static float directionProbability;
    static float killProbabllity;
    static float matingProbability;
    //virtual bool willMove();
    //virtual void doMove(Board *board);
};
#endif

全栈跟踪

g++ src/*.cpp -o out/main.o -Wall -std=c++11 && ./out/main.o
In file included from src/cell.h:8:0,
                 from src/board.h:4,
                 from src/creature.h:5,
                 from src/aphid.h:4,
                 from src/aphid.cpp:2:
src/ladybird.h:6:34: error: expected class-name before ‘{’ token
 class Ladybird : public Creature {
                                  ^
src/cell.cpp: In member function ‘void Cell::simulateMove(Board*)’:
src/cell.cpp:44:19: error: ‘class Aphid’ has no member named ‘willMove’
         if((*it)->willMove()){
                   ^
src/cell.cpp:45:18: error: ‘class Aphid’ has no member named ‘doMove’
           (*it)->doMove(newBoard);
                  ^
In file included from src/cell.h:7:0,
                 from src/board.h:4,
                 from src/creature.h:5,
                 from src/creature.cpp:1:
src/aphid.h:6:31: error: expected class-name before ‘{’ token
 class Aphid : public Creature {
                               ^
In file included from src/cell.h:8:0,
                 from src/board.h:4,
                 from src/creature.h:5,
                 from src/creature.cpp:1:
src/ladybird.h:6:34: error: expected class-name before ‘{’ token
 class Ladybird : public Creature {
                                  ^
In file included from src/cell.h:7:0,
                 from src/board.h:4,
                 from src/creature.h:5,
                 from src/ladybird.h:4,
                 from src/ladybird.cpp:2:
src/aphid.h:6:31: error: expected class-name before ‘{’ token
 class Aphid : public Creature {
                               ^

我尝试向前声明Creature类，但后来我得到了invalid use of incomplete type ‘class Creature’

板.h：

#ifndef BOARD_H_
#define BOARD_H_
#include "cell.h"
#include "creature.h"
class Board{
  private:
    Cell ***board; // A 2D ARRAY OF POINTERS, "what if i just add more stars??!" -- Owen G
    int width;
    int height;
  public:
    Board(int width, int height);
    void populate();
    Cell* getCell(int x, int y);
    void print();
    void simulateMove(Board *board);
};
#endif

单元格.h：

#ifndef CELL_H_
#define CELL_H_
#include <iostream>
#include <list>
#include "aphid.h"
#include "ladybird.h"
#include "board.h"
class Board;
class Aphid;
class Ladybird;
class Cell{
  private:
    int x, y;
    std::list<Aphid*> aphids;
    std::list<Ladybird*> ladybirds;
  public:
    Cell(int x, int y);
    void addCreature(Aphid *creature);
    void addCreature(Ladybird *creature);
    int getAphidCount();
    int getLadybirdCount();
    void simulateMove(Board *nextGenerationBoard);
};
#endif