[omniORB] cannot convert from 'list_var *__w64 ' to 'list *

[Luke Deller]

Hi Janusz,

> lcc::ProtocolDataList* TugunSituationListener::getSupportedProtocols()
> {
>     lcc::ProtocolDataList_var list = new lcc::ProtocolDataList();
...
>     return &list;

The return type of this function should be lcc::ProtocolDataList_ptr rather than lcc::ProtocolDataList*
Also the return statement should be:
    return list._retn();

For documentation about how to do this right, see the C++ language mapping for CORBA IDL.  The language mappings are available here:
http://www.omg.org/technology/documents/idl2x_spec_catalog.htm

> Error      2              error C2440: 'return' : cannot convert from 'lcc::ProtocolDataList_var *__w64 ' to 'lcc::ProtocolDataList *'
> I don't understand this, why omniORB is trying to use 64 bit version for pointer?

This "__w64" modifier is not saying what you think - it merely indicates that the size of this ProtoclDataList_var type is 32-bits when compiled as 32-bit, and the size is 64-bits when compiled as 64-bit.  This is used by the /Wp64 compiler option to help detect 64-bit portability issues.

http://msdn.microsoft.com/en-us/library/yt4xw8fh(v=vs.80).aspx

Regards,
Luke.
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