* [Caml-list] Data_custom_val(v)
@ 2001-07-15 3:16 Alexander V. Voinov
2001-07-20 14:00 ` Xavier Leroy
0 siblings, 1 reply; 2+ messages in thread
From: Alexander V. Voinov @ 2001-07-15 3:16 UTC (permalink / raw)
To: caml
Hi Developers,
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;
Alexander
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^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [Caml-list] Data_custom_val(v) 2001-07-15 3:16 [Caml-list] Data_custom_val(v) Alexander V. Voinov @ 2001-07-20 14:00 ` Xavier Leroy 0 siblings, 0 replies; 2+ messages in thread From: Xavier Leroy @ 2001-07-20 14:00 UTC (permalink / raw) To: Alexander V. Voinov; +Cc: caml > 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 ------------------- Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2001-07-20 14:01 UTC | newest] Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2001-07-15 3:16 [Caml-list] Data_custom_val(v) Alexander V. Voinov 2001-07-20 14:00 ` Xavier Leroy
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