Re: Point class

Hi everyone, I found an example of a Point class in another message in
the group but I can't compile with gnu g++. Anyone has any clue why it
doesn't work? The code for the class and the error messages are:

// This template will have an error if L1 & L2 are not equal
template <int L1, int L2 >
struct AssertEqual
{
        char foo[ (L1==L2)?1:-1 ]; // error if L1 != L2

};

template<int nDim>
class Point
{
public:
    double GetCoordinate(int iDim)
     {
       return m_coordinate[iDim];
     }

    // define all the constuctors adding a default last parameter
    // whose type will have an error if it is instantiated
    Point( double v0, AssertEqual<nDim,1> & = AssertEqual<nDim,1>() )
    {
                m_coordinate[0] = v0;
    }

    Point( double v0, double v1, AssertEqual<nDim,2> & =
AssertEqual<nDim,2>() )
    {
                m_coordinate[0] = v0;
                m_coordinate[1] = v1;
    }

    Point( double v0, double v1, double v2, AssertEqual<nDim,3> & =
AssertEqual<nDim,3>() )
    {
                m_coordinate[0] = v0;
                m_coordinate[1] = v1;
                m_coordinate[2] = v2;
   }

private:
    double m_coordinate[nDim];

};

aa@linux:~/Desktop> g++ geom.cxx
geom.h:34: error: expected identifier before numeric constant
geom.h:34: error: expected ',' or '...' before numeric constant
geom.h:34: error: wrong number of template arguments (1, should be 2)
geom.h:12: error: provided for 'template<int a, int b> struct
AssertEqual'
geom.h:34: error: default argument missing for parameter 4 of
'Point<n, T>::Point(T, T, AssertEqual<n, 2>&, int)'

Thanks for your help.