[omniORB] Problem passing an array of structs

[W T Meyer]

Since no one else responded, I'll answer my own question.  I know how 
to get around the problem, but I don't understand why it is a problem.

Apparently operator[] is overloaded in omniORB only for unsigned 
int.  When I changed the index variable i in line 90 from "int i" to 
"unsigned int i" everything worked. The error message is somewhat 
less than transparent in pointing to the problem.

Is there a reason for requiring unsigned ints?  If so, is there a way 
to give the hapless user a more helpful error message?

Regards,

Tom

At 03:40 PM 5/7/2007, W T Meyer wrote:
>I'm trying to pass a fixed-length array of structs and I'm getting a 
>cryptic error message.  I see others have posted similar - but not 
>identical - problems and it is not clear to me what the solution or 
>workaround is. Can someone provide some insight?
>
>Here is my IDL:
>------------
>module CoRCC {
>
>    enum vmeType {SBC, ROD, TIM, EMPTY, OTHER, UNKNOWNTYPE};
>    enum vmeModStatus {OK, WARNING, ERROR, UNKNOWNSTATUS};
>    struct slotInfo {
>       vmeType contents;
>       long serNo;
>       vmeModStatus status;
>       long revision;
>    };
>
>    typedef slotInfo crateInfo[22];
>
>    interface RCC {
>       long scanCrate(out crateInfo modList);
>    }; /* end of interface RCC */
>}; /* end of module CoRCC */
>-----------
>In my server application, everything compiles and links with no 
>warnings or errors.
>
>When I try to build a client, I get the following error message:
>-------------
>CoRCCClient.cc:92: choosing `T& _CORBA_Array_Fix_Var<T_Helper,
>    T>::operator[](long unsigned int) [with T_Helper =
>    CoRCC::crateInfo_copyHelper, T = CoRCC::crateInfo_slice]' over 
> `operator[]'
>CoRCCClient.cc:92:   because worst conversion for the former is better than
>    worst conversion for the latter
>-------------
>
>The relevant part of the client code is as follows:
>-------------
>int ScanCrate(int rccHandle) {
>   int status = 0;
>   int serNo;
>   CoRCC::crateInfo_var modList = new CoRCC::crateInfo();
>   status = rccref[rccHandle]->scanCrate(modList);
>   for (int i=2; i<NSLOTS+1; i++) {
>     cout << "Slot Number " << i << endl;
>     serNo = modList[i].serNo;           //<<<< This is line 92, 
> where the error is
>   }
>   return status;
>}
>
>
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