I'm working on overhauling a class (see [1]) that wraps some c++, and
I've got just about everything working how I want... but I have a
nagging doubt about performance.

Is the following fast?  Can it be made fast without a bunch of ugly
python c-api stuff?

cdef tupletuple(vector[vector[int]] M):
    cdef int i, j

    return tuple(tuple(M[j][i] for i in range(M[j].size()) for j in
range(M.size()))

Thanks!

[1] http://trac.sagemath.org/ticket/11814

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