On Friday 18 March 2005 11:27, Akos Polster wrote:
> I'm getting this error while compiling PyKDE-snapshot20050316 on
> Linux with GCC 4.0:
>
> sip/kdecore/kurl.sip: In function âPyObject*
> slot_KURL_List___add__(PyObject*, PyObject*)â:
> sip/kdecore/kurl.sip:348: error: invalid cast of an rvalue expression of
> type âQValueList<KURL>â to type âconst KURL::List&â
>
> The environment is:
>
> - Python 2.4.0
> - sip snapshot-20050317
> - QT 3.3.4
> - PyQt snapshot-20050311
> - KDE 3.4.0
> - GCC 4.0.0 20050310 (Red Hat 4.0.0-0.33)
Here's the code in question with the failing line indicated:
sip/kdecore/kurl.sip
============
KURL::List operator + (const KURL::List&);
%MethodCode
//returns (KURL.List)
//takes listToAdd | (KURL.List)
Py_BEGIN_ALLOW_THREADS
==>> sipRes = new KURL::List((const KURL::List&)((*sipCpp) + *a0));
Py_END_ALLOW_THREADS
%End
Here's the generated C++ code:
kdecore/sipkdecorepart0.cpp
==================
static PyObject *slot_KURL_List___add__(PyObject *sipSelf,PyObject *sipArg)
{
==>> KURL::List *sipCpp = reinterpret_cast<KURL::List *>(sipGetCppPtr(
(sipWrapper *)sipSelf,sipClass_KURL_List));
if (!sipCpp)
return 0;
int sipArgsParsed = 0;
{
const KURL::List * a0;
if
(sipParseArgs(&sipArgsParsed,sipArg,"J1",sipClass_KURL_List,&a0))
{
KURL::List *sipRes = 0;
#line 345 "sip/kdecore/kurl.sip"
//returns (KURL.List)
//takes listToAdd | (KURL.List)
Py_BEGIN_ALLOW_THREADS
sipRes = new KURL::List((const KURL::List&)((*sipCpp) + *a0));
Py_END_ALLOW_THREADS
#line 19720 "sipkdecorepart0.cpp"
return
sipNewCppToSelf(sipRes,sipClass_KURL_List,SIP_SIMPLE|SIP_PY_OWNED);
}
}
/* Raise an exception if the arguments couldn't be parsed. */
sipNoMethod(sipArgsParsed,sipNm_kdecore_List,sipNm_kdecore___add__);
return 0;
}
note that sipCpp is of type KURL::List.
Here's the class declaration for KURL::List:
kdelibs-3.4.0/kdecore/kurl.h
==================
class KURL
{
...
class KDECORE_EXPORT List : public QValueList<KURL>
And from Qt, the copy constructor being used requires a 'const':
QValueList ( const QValueList<T> & l )
I don't see where the cast is in error (but then my C++ skills aren't that
great).
I don't have gcc 4.0 to test against, so I have no way of pursuing this much
farther. The easiest workaround would be to comment out the code fragment
shown above from sip/kdecore/kurl.sip (you lose the + operator for
KURL::List). The cast is there because it won't compile without it on gcc 3.3
- it can't find a "non-const" copy ctor to use, which is what sip generates
without the cast.
Jim
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