Hello,

I already posted this problem on comp.lang.c++ since I thought I was wrong.
But perhaps the piece of code below is standard compliant. It compiles fine
with gcc 3.2 (up to 3.4), but it does not compile with Comeau C++.

"Inherited member not allowed". + "Identifier Index is undefined"

Here it is: Is it snandard compliant?

template <typename D>
class ConstMatrix
{
    public:
        typedef typename D::Index Index;

        double
        operator()(const Index &i) const { return 0.0;  }
};

template <typename D>
class Matrix
    : public ConstMatrix<D>
{
    public:
        typedef typename D::Index Index;

        double
        operator()(const Index &i);

        using ConstMatrix<D>::operator();
};


template <typename D>
double
Matrix<D>::operator()(const Index &i) { return 0.0; }

class X
{
    public:
        typedef int Index;
};

int
main()
{
    Matrix<X> m;
    m(3);
}

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