c – 错误：字段类型不完整

嗨！我陷入了一个似乎无法解决的错误.

以下是我的代码：

#ifndef QUATERNION_H
#define QUATERNION_H

#include "vec3.h"

class Vec3;

class Quaternion
{

public:

 Quaternion(Vec3 v);

 Quaternion(double w,Vec3 v);

 Vec3 v; <--------------------------This is where the error is :(

 double scalar;



 Quaternion operator *(Quaternion s);

 Quaternion conjugate();

};



#endif

我的Vec.h看起来像这样：

#ifndef VEC3_H

#define VEC3_H



#include "point.h"

#include "quaternion.h"

#include <math.h>

class Quaternion;


class Vec3

{

 friend ofstream& operator <<(ofstream& output,const Vec3& p);

 friend ifstream& operator >>(ifstream& input,Vec3& p);



 public: 

 Vec3();

 Vec3(double _x,double _y);

 Vec3(double _x,double _y,double _z);



 double x,y,z;



 //Operators

 Vec3 operator -(Vec3 a) const;

 Vec3 operator /(double s) const;

 Vec3 operator *(double s) const;

 Vec3 operator *(Quaternion q) const;



 // Used to do vector Vec3 addition

 Vec3 operator +(Vec3 a) const;

 Point operator +(Point a) const;



 Vec3& operator =(Point a);



 Vec3 crossProduct(Vec3 v1); // Itself cross v1

 double dotProduct(Vec3 v);

 double length();

 void normalize();


};



#endif

再次感谢您的帮助=)