> On Mon, 6 Jun 2005 17:54:43 +0100
> Phil Thompson <[EMAIL PROTECTED]> wrote:
>
>> SIP's exception support was added by a user - I've never used it myself.
>> Suggestions for improvements always welcome.
>
> I see the following scenario. User creates exception class and expose
> it in module namespace (Please correct me if there is a better way):
>
> %ModuleCode
> static PyObject *MyException_object;
> %End
>
> %PostInitialisationCode
> MyException_object = PyErr_NewException("MyModule.MyException", 0, 0);
> if (!MyException_object) return;
> PyDict_SetItemString(sip_mdict, "MyException", MyException_object);
> %End
>
> Then he has to define one way mapping for it (assuming MyException has
> the same interface as std::exception):
>
> %MappedType MyException
> {
>
> %ConvertFromTypeCode
> return PyObject_CallFunction(MyException_object, "S", sipCpp->what());
> %End
>
> %ConvertToTypeCode
> // We don't need backward convertion, but SIP requires it.
> *sipIsErr = 1;
> return 0;
> %End
>
> };
So if I introduce something like...
%ExceptionType MyException
%TypeHeaderCode
#include <whatever>
%End
%ConvertFromTypeCode
// C++ code to return a PyObject instance of the exception.
// sipCpp (the C++ poiter) and sipException_MyException (the
// PyObject exception type) will be available, eg...
return PyObject_CallFunction(sipException_MyException, "S",
sipCpp->what());
%End
%End
...that has the same effect as your code above.
> That's all. Now generated code for method with signature
> "void error() throw (MyException);" should be equivalent to
> something like the following:
>
> try
> {
> sipCpp -> Test::error();
> }
> catch (MyException &e)
> {
> PyObject *MyException_instance = ... // %ConvertFromTypeCode
> PyObject *MyException_object =
> PyObject_Type(MyException_instance);
> PyErr_SetObject(MyException_object, MyException_instance);
> return NULL;
> }
...and generate the above code automatically, then that gives you what you
want? If MyException isn't defined then it reverts to the current
behaviour.
Phil
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