> I forgot to mention that Data_custom_val(v) doesn't allow for
> assignments in C++, instead I have to use
> 
>     value blk = alloc_custom(...);
>     *(void **)&(Field(blk, 1)) = (void *)some_data;

Don't do that, because someday the data part of the custom block may
not be at offset 1.

What is wrong with

     value blk = alloc_custom(...);
     mytype * mydata = (mytype *) Data_custom_val(v);
     *mydata = <initial value>;

or, more concisely,
     *((mytype *) Data_custom_val(v)) = <initial value>;

Is it that evil C++ that don't let you do that?

- Xavier Leroy
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