Hi Folks:
I have a question about the use of static members in Python/C
extensions. Take the simple example from the "Extending and Embedding
the Python Interpreter" docs:
A simple module method:
static PyObject *
spam_system(PyObject *self, PyObject *args)
{
...
}
listed in a method table:
static PyMethodDef SpamMethods[] = {
...
{"system", spam_system, METH_VARARGS,
"Execute a shell command."},
...
{NULL, NULL, 0, NULL} /* Sentinel */
};
that is registered with:
PyMODINIT_FUNC
initspam(void)
{
(void) Py_InitModule("spam", SpamMethods);
}
I have an application that embed multiple interpreters. I want to be
able to register methods for each interpreter that access C++ state
data relevant to that particular interpreter. In other words I want to
be able to register non-static class members in a class like the
following:
class PythonSpamModuleInstance
{
PythonSpamModuleInstance()
{
SpamMethods[0]={"system", spam_system, METH_VARARGS,"Execute
a shell command."};
SpamMethods[1]={NULL, NULL, 0, NULL};
PyObject *spammodule=Py_InitModule("spam", SpamMethods); //
Needs an INCREF call?
}
~PythonSpamModuleInstance()
{
PyObject_Del("spam", SpamMethods);
}
PyObject *spam_system(PyObject *self, PyObject *args)
{
// accesses non-static data in this class
}
PyMethodDef SpamMethods[2];
PyObject *spammodule;
// Other data specific to this instance of the module
};
The idea is that each time my app launches an embedded Interpreter it
will create an accompanying instance of PythonSpamModuleInstance that
allows the Interpreter to call the registered non-static C++ member
function spam_system. Calls to that member function will also affect
state information.
So the questions: will this work? In particular, will the use of non-
static member functions cause problems? Is there a better way of
creating extension modules for multiple embedded interpreters? If I am
forced to use static methods, how do i figure out which interpreter is
calling them?
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