Mass Deface context) #define WindowObjectIsValid(winobj) \ ((winobj) != NULL && IsA(winobj, WindowObjectData)) extern void *WinGetPartitionLocalMemory(WindowObject winobj, Size sz); extern int64 WinGetCurrentPosition(WindowObject winobj); extern int64 WinGetPartitionRowCount(WindowObject winobj); extern void WinSetMarkPosition(WindowObject winobj, int64 markpos); extern bool WinRowsArePeers(WindowObject winobj, int64 pos1, int64 pos2); extern Datum WinGetFuncArgInPartition(WindowObject winobj, int argno, int relpos, int seektype, bool set_mark, bool *isnull, bool *isout); extern Datum WinGetFuncArgInFrame(WindowObject winobj, int argno, int relpos, int seektype, bool set_mark, bool *isnull, bool *isout); extern Datum WinGetFuncArgCurrent(WindowObject winobj, int argno, bool *isnull); #endif /* WINDOWAPI_H */