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//该类的定义如下:
typedef struct D3DXVECTOR3:public D3DVECTOR{
public:
D3DVECTOR3(){};
D3DVECTOR3(CONST FLOAT *);
D3DVECTOR3(CONST D3DVECTOR&);
D3DVECTOR3(FLOAT x,FLOAT y,FLOAT z);
//casting
operator FLOAT*();
operator CONST FLOAT* () const;
//assignment operators
D3DXVECTOR3& operator += (CONST D3DXVECTOR3&);
D3DXVECTOR3& operator -= (CONST D3DXVECTOR3&);
D3DXVECTOR3& operator *= (FLOAT);
D3DXVECTOR3& operator /= (FLOAT);
//unary operators
D3DXVECTOR3 operator + () const;
D3DXVECTOR3 operator - () const;
//binary operators
D3DXVECTOR3 operator + (CONST D3DXVECTOR3&) const;
D3DXVECTOR3 operator - (CONST D3DXVECTOR3&) const;
D3DXVECTOR3 operator * (FLOAT) const;
D3DXVECTOR3 operator / (FLOAT) const;
friend D3DXVECTOR3 operator * (FLOAT,CONST struct D3DXVECTOR3&);
BOOL operator == (CONST D3DXVECTOR3&) const;
BOOL operator != (CONST D3DXVECTOR3&) const;
}D3DXVECTOR3,*LPD3DXVECTOR3;//D3DXVECTOR3继承于D3DVECTOR
typedef struct D3DVECTOR{
float x,y,z;
}D3DVECTOR;