S

#### Steven T. Hatton

template <typename T>

class Vector3 {

public:

Vector3(const T& x=0,

const T& y=0,

const T& z=0)

: _v(3)

{

_v[0]=x;

_v[1]=y;

_v[2]=z;

}

~Vector3()

{}

/*...*/

/** {1, 0 ,0} */

static const Vector3<T> I;

/** {0, 1 ,0} */

static const Vector3<T> J;

/** {0, 0 ,1} */

static const Vector3<T> K;

private:

vector<T> _v;

};

It works for non-template classes of the same form, but I keep getting

linker errors saying 'undefined reference to Vector3<float>I', etc.

This is what I currently have in the source file. I have no good reason to

believe it makes the least bit of sense, other than the fact the compiler

doesn't complain:

template<typename T>

const Vector3<T> Vector3<T>::I = Vector3<T>(1,0,0);

template<typename T>

const Vector3<T> Vector3<T>::J = Vector3<T>(0,1,0);

template<typename T>

const Vector3<T> Vector3<T>::K = Vector3<T>(0,0,1);

--

"If our hypothesis is about anything and not about some one or more

particular things, then our deductions constitute mathematics. Thus

mathematics may be defined as the subject in which we never know what we

are talking about, nor whether what we are saying is true." - Bertrand

Russell