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=)