question about HDF5 compound type macros...


When creating compound types, I rely on the HOFFSET macro:

      if (H5Tinsert(typeid, LIQUOR, HOFFSET(struct s2, i2), H5T_NATIVE_INT) < 
0) ERR;

I see that HOFFSET, in turn, is just using the C macro offsetof.

> From reading around, it seems that offsetof might return different
numbers on different platforms, since, as I understand it, the
internal padding of structs is platform dependent.

Is this true? Can HOFFSET give me one answer on one machine, and
another on another machine, or with a different compiler?

Any thoughts would be most appreciated.



Ed Hartnett  -- ed@xxxxxxxxxxxxxxxx