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typedef struct D3DXVECTOR3 : public D3DVECTOR
{
...
// assignment operators
D3DXVECTOR3& operator += ( CONST D3DXVECTOR3& );
D3DXVECTOR3& operator -= ( CONST D3DXVECTOR3& );
D3DXVECTOR3& operator *= ( FLOAT );
D3DXVECTOR3& operator /= ( FLOAT );
...
} D3DXVECTOR3, *LPD3DXVECTOR3;
D3DXVECTOR3 obj;
obj+=1.2f;
int i=2;
obj(i);
obj(&i);