+/* This macro is a shortcut for calls like
+ * x = PyObject_Repr(x);
+ * This can't be done like this example because this would leak
+ * a reference the the original x and crash in case of x == NULL.
+ * This calling syntax is less than elegant but it works, saves
+ * a lot of lines and avoids potential refcount errors. */
+
+#define CPY_SUBSTITUTE(func, a, ...) do {\
+ if ((a) != NULL) {\
+ PyObject *__tmp = (a);\
+ (a) = func(__VA_ARGS__);\
+ Py_DECREF(__tmp);\
+ }\
+} while(0)