How to reference nested classes in templates?

[Charles Bouillaguet]

Dear all,

I am trying to hook LinBox into sage more tightly, and LinBox makes extensive use of templates, amongst other kinds of nastiness.

LinBox has classes for various mathematical domains, and a lot functions are templated by the domain on which they operate. I am typically facing:

template<Matrix>

void determinant(Matrix::Field::Element &result, const Matrix &A);

                 ^^^^^^^^^^^^^^^^^^^^^^

The Matrix class describes either a sparse or dense matrix, over the integers/rationals/modulo-p-implemented-as-floats, etc.

The problem is that I don't know how to refer to the nested classes of the template class. If I write the following cython declaration:

cdef extern from "linbox/solutions/det.h" namespace "LinBox":

    cdef void determinant[Matrix] (Matrix.Field.Element &result, const Matrix &A) 

I get an error: "Matrix is not a cimported module".

The only workaround I have found so far is to give up on genericity and write :

cdef extern from "linbox/solutions/det.h" namespace "LinBox":

    cdef void determinant(TheFieldIWant &result, const TheMatrixIWant &A) 

    cdef void determinant(TheOtherFieldIWant &result, const TheOtherMatrixIWant &A) 

    ...

Some advice would be much appreciated! :-)

Best regards,

--

Charles Bouillaguet

http://cristal.univ-lille.fr/~bouillag/

[Robert Bradshaw]

I'm assuming that Matrix::Field::Element is a typedef (of a typedef)
in the Matrix class? This feature was just recently added and will be
available in the next release.

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