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pointer arithmetic for alignment on short or int boundry


I need to calculate an address on a short or int boundry. For some reason this is not working:

char *a;

a = (a + 1) & ((char*) -2));

Gcc 3.3 on Solaris complains:

error: invalid operands of types `char*' and `
   char*' to binary `operator&'

Why shouldn't I be able to mask off the low bit?

Thanks,

Andy


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