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> Thus, I would like to have possibility to distinguish between these > two situations, and, _if_it_is_possible_, to use the underlying > one-dimensional chunk of multi-dim. array directly, without copying > its data to new location (and back). I agree you don't want to copy the underlying data if you don't have to. But I think we need to distinguish: (1) the underlying one-dimensional array that a shared array descriptor points to, and (2) the address in memory of the first element of the array. The former is a SCM value. I still see no use for a Scheme program to be able to access it. The latter is an (int*) or a (double*) or even a (SCM*). It is useful in passing the data to C or Fortran routines. Because the address of the first element is not a SCM value, there should be no Scheme function to get it. It should only be a function in the C API. (Of course the FFI glue code should automatically get the address when specified.) --Per Bothner Cygnus Solutions bothner@cygnus.com http://www.cygnus.com/~bothner