error C2679

[lothas]

Hi, I'm working on a project to create a robotics simulation environment based on c++ and opengl. Right now I'm stuck trying to solve a compilation error that I'm getting while trying to push_back an object from one of my classes.
Here's part of the code:

class RobotStruct  
{
public:
	RobotStruct();
	virtual ~RobotStruct();

	void AddJoint(float Theta, float Alpha, float a, float d, int Type);
	void PopJoint(int ID) { Joints.erase(Joints.begin()+ID); }

	void DrawRobot();

private:
	std::vector<RobotJoint> Joints;
	
};

class RobotJoint  
{
public:
	RobotJoint();
	virtual ~RobotJoint();
	
	void Set(float _Theta, float _Alpha, float _a, float _d, int _Type);

	void Draw(int ID);

private:
	int Type;
	float Theta;
	float Alpha;
	float a;
	float d;
	Axes JointAxes;
};

class Axes  
{
public:
	Axes();
	virtual ~Axes();

	void SetID(char* _ID) { ID=_ID; }
	char* GetID() const { return ID; }

	void SetOrigin(Vector _Origin) { Origin=_Origin; }
	void SetOrigin(float _x, float _y, float _z) { Origin.x=_x; Origin.y=_y; Origin.z=_z; }

	void SetAxes(Vector X, Vector Y, Vector Z);
	void SetAxes(float Xx, float Xy, float Xz, float Yx, float Yy, float Yz, float Zx, float Zy, float Zz);

	void PrintSolid(float Length, float Width, int Resolution, bool OnTop) const;
	void PrintWire(float Length, float Width, int Resolution, bool OnTop) const;

private:
	char* ID;
	Vector Origin;
	Vector AxisX;
	Vector AxisY;
	Vector AxisZ;
};

Ok, the error I'm getting is:

c:\program files\microsoft visual studio\vc98\include\xutility(39) : error C2679: binary '=' : no operator defined which takes a right-hand operand of type 'const class RobotJoint' (or there is no acceptable conversion)
        c:\program files\microsoft visual studio\vc98\include\vector(170) : see reference to function template instantiation 'void __cdecl std::fill(class RobotJoint *,class RobotJoint *,const class RobotJoint &)' being compiled

when I try to do a push_back here:

void RobotStruct::AddJoint(float Theta, float Alpha, float a, float d, int Type) {
	RobotJoint Joint;
	Joint.Set(Theta, Alpha, a, d, Type);
	Joints.push_back(Joint);
}

This used to work properly until I added the class Axes object to the RobotJoint class. Can anyone tell me what am I doing wrong?

[donbock]

Your error messages refer to
line 39 of xutility
line 170 of vector

Where do those lines appear in the code excerpts you provided?

[lothas]

Those lines would be in the C++ vector class...

[newb16]

looks like robojoint can't be copied:

 RobotJoint  a,b;
a = b;

Can this be compiled? If not, mostly like because of "Vector Origin;" and other 'Vector' member is Axes. ( Though I have no idea what 'Vector' is)
And if it can't be copied, it can't be placed in std::vector

[lothas]

Exactly. I just managed to solve that today. The RobotJoint class had no problem in being copied as long as it had only floats and chars but when I added an object from Axes class it started complaining.
I overloaded the = operator for the Axes class and now everything compiles properly.