Can you give an example of the struct/union (shortened, perhaps) and your
Julia version?
On Sat, May 3, 2014 at 1:21 PM, James Porter <porterjam...@gmail.com> wrote:
> How would I convert manually? Right now I'm trying to use a placeholder
> bitstype of the appropriate size and reinterpret it is the correct
> immutable type, but I'm getting BoundsErrors in reinterpret and I'm not
> sure if this is the right thing to be doing.
>
>
> On Saturday, May 3, 2014 12:14:03 PM UTC-5, Isaiah wrote:
>
>> The size of a union is the size of the largest element. There is no way
>> to access one memory range as different names/types like a C union, but you
>> could do the down-conversion from the max type manually as needed.
>>
>> Also you might want to have a look at the StrPack package (not sure if it
>> supports unions).
>>
>>
>> On Sat, May 3, 2014 at 2:25 AM, James Porter <porter...@gmail.com> wrote:
>>
>>> Hi all—
>>>
>>> I am fooling around with wrapping a C library which declares a struct in
>>> a similar manner to:
>>>
>>>
>>> typedef struct Thing {
>>> //other non-union fields here . . .
>>> union {
>>> A a;
>>> B b;
>>> C c;
>>> } stuff;
>>> }
>>>
>>>
>>>
>>> Where A, B, and C are all other structs defined in this package. How do
>>> I deal with the stuff field here? I've been looking around at library
>>> examples and posts on the mailing list about how to handle wrapping this
>>> sort of thing and I can't find anything. LIBSVM.jl provides a good
>>> example<https://github.com/simonster/LIBSVM.jl/blob/master/src/LIBSVM.jl#L19-L47>of
>>> wrapping a relatively complex structure that doesn't involve unions,
>>> there are posts on the mailing
>>> list<https://groups.google.com/forum/#!searchin/julia-dev/union$20struct/julia-dev/p6DUUSdtY2A/h3J3V7T3OcoJ>
>>> about
>>> wrapping unions of pointers, ints, etc., but I can't find anything about
>>> wrapping unions of structs. Does anyone have any advice for how to handle
>>> this sort of thing?
>>>
>>> Cheers,
>>> James
>>>
>>
>>
