DataContext keeps reference to parent BasicIo

Author: jim-easterbrook

src/interface/basicio.i

@@ -207,6 +207,7 @@ public:
     };
 };
 %}
+KEEP_REFERENCE(DataContext*);
 
 // Add Exiv2::BasicIo::data() method to return a context manager
 %feature("docstring") Exiv2::BasicIo::data "Return a data context manager.

src/swig-0_27_7/basicio_wrap.cxx

@@ -5797,6 +5797,12 @@ SWIGINTERN PyObject *_wrap_BasicIo_data(PyObject *self, PyObject *args) {
     }
   }
   resultobj = SWIG_NewPointerObj(SWIG_as_voidptr(result), SWIGTYPE_p_DataContext, SWIG_POINTER_OWN |  0 );
+  
+  if (resultobj != Py_None)
+  if (PyObject_SetAttrString(resultobj, "_refers_to", self)) {
+    SWIG_fail;
+  }
+  
   return resultobj;
 fail:
   return NULL;

src/swig-0_28_5/basicio_wrap.cxx

@@ -6065,6 +6065,12 @@ SWIGINTERN PyObject *_wrap_BasicIo_data(PyObject *self, PyObject *args) {
     }
   }
   resultobj = SWIG_NewPointerObj(SWIG_as_voidptr(result), SWIGTYPE_p_DataContext, SWIG_POINTER_OWN |  0 );
+  
+  if (resultobj != Py_None)
+  if (PyObject_SetAttrString(resultobj, "_refers_to", self)) {
+    SWIG_fail;
+  }
+  
   return resultobj;
 fail:
   return NULL;