question about HDF5 compound type macros...

• To: netcdf-hdf@xxxxxxxxxxxxxxxx
• Subject: question about HDF5 compound type macros...
• From: Ed Hartnett <ed@xxxxxxxxxxxxxxxx>
• Date: Fri, 22 Apr 2005 07:13:56 -0600

HDF5ers,

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.

Thanks,

Ed

-- 
Ed Hartnett  -- ed@xxxxxxxxxxxxxxxx

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  • Re: question about HDF5 compound type macros...
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