[Cython] about to buffer syntax

[Lisandro Dalcin]

I'm still convinced that Fortran 90 array declarators could provide a
more powerfull syntax for buffers, For this, the dimensions should be
specified with a tuple, examples below:

cdef ndarray[int, ()] a # a  scalar

cdef ndarray[int, (3,)] # a1D array with 3 items

cdef ndarray[int, (:,)] # a 1D array of any size

cdef ndarray[int  (2,3)] # 2D array with 2 rows and 3 columns

cdef ndarray[int  (:,3)] # 2D array with any number of rows and 3 columns

cdef ndarray[int  (:,:)] # 2D array with any number of rows and columns

cdef ndarray[float,  (3,3,:)] # 3D array,  a 'sequence' of 3x3 array


We could even use Ellipsis '...' in a similar sense numpy uses them

cdef ndarray[int, (...)] # any number of dimension

cdef ndarray[int, (:, ...)] # at least 1D

cdef ndarray[int, (:, : ,...)] # at least 3D

cdef ndarray[int, (3, 5, ...)] # at least 2D, but required shape in
first two dims.


What do you think?


-- 
Lisandro Dalcín
---------------
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
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