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swig/Lib/python/defarg.swg

Index: swig/Lib/python/defarg.swg
===================================================================
--- swig/Lib/python/defarg.swg	(revision 0)
+++ swig/Lib/python/defarg.swg	(revision 0)
@@ -0,0 +1,37 @@
+/* This file defines an internal function for processing default arguments
+   with proxy classes.
+
+   There seems to be no straightforward way to write proxy functions
+   involving default arguments. For example :
+
+             def foo(arg1,arg2,*args):
+                     proxyc.foo(arg1,arg2,args)
+
+   This fails because args is now a tuple and SWIG doesn't know what to
+   do with it.
+
+   This file allows a different approach :
+
+            def foo(arg1,arg2,*args):
+                    proxyc.__call_defarg(proxyc.foo,(arg1,arg2,)+args)
+
+   Basically, we form a new tuple from the object, call this special
+   __call_defarg method and it passes control to the real wrapper function.
+   An ugly hack, but it works.
+*/
+
+SWIGINTERN PyObject *swig_call_defargs(PyObject *self, PyObject *args) {
+  PyObject *func;
+  PyObject *parms;
+  
+  if (!PyArg_ParseTuple(args,"OO",&func,&parms))
+    return NULL;
+  
+  if (!PyCallable_Check(func)) {
+    SWIG_PYTHON_THREAD_BEGIN_BLOCK;
+    PyErr_SetString(PyExc_TypeError, "__call_defarg : Need a callable object!");
+    SWIG_PYTHON_THREAD_END_BLOCK;
+    return NULL;
+  }
+  return PyEval_CallObject(func,parms);
+}