[netcdfgroup] How to write fortran90 derived type to netcdf compound type

Dear all,
I found the thread "Compound type and Fortran90" in the 2013 mailing list archive, where it is said that you cannot write an entire fortran90 derived type into a compound type. But it is also said that you can write the individual components ... unfortunately, there is no example for this. 

Here is my case:

type foo
  INTEGER :: a
  INTEGER :: b
  REAL    :: c
end type foo

TYPE(foo), DIMENSION(ndim) :: datafield
...
nf90_def_compound(ncid, 2*INTSIZE + REALSIZE, "triple", typeid)
nf90_insert_compound(ncid, typeid, "a", 0, NF90_INT)
nf90_insert_compound(ncid, typeid, "b", INTSIZE, NF90_INT)
nf90_insert_compound(ncid, typeid, "c", 2*INTSIZE, NF90_FLOAT)
nf90_def_var(ncid, "data", typeid, dimid, varid)

nf90_put_var(ncid, varid, datafield) ! this is not possible
...
What is the right way to put my data from the derived type array datafield into the netcdf compound type? 

Cheers,
Hendryk

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