BZDEV: Index arithmetic

[William C. <wch...@ja...>]

I can do arithmetic on indices; I can do indexing with indices; but I
can't do both at once:

        #include <blitz/array.h>

        using namespace blitz;

        int main(int argc, char *argv)
        {
          Array<int, 1> s(4);
          Array<int, 1> t(4);
          t = 10, 20, 30, 40;

          firstIndex i;

          // I can do arithmetic on indices

          s = 3 - i;

          // I can do indexing with indices

          s = t(i);

          // But I can't do both at once!

          s = t(3 - i);                 // "no match for call"

          cout << s << "\n";
        }

How much would it take to get expressions like arrayexp(index
arithmetic exp) turned into array(integer)?  I know that wouldn't be
as efficient in the example above as using reverse(); but it can be a
nice notation, especially for transcribing written definitions of
structured vectors/matrices.

Regards,
William

P.S. I tried Blitz a few years ago, but now's the first time I've had
a reason to play with it on a machine with enough memory ;).  Very,
very nice!

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