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/*-------------------------------------------------------------------------
*
* sdir.h--
* POSTGRES scan direction definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: sdir.h,v 1.1.1.1 1996/07/09 06:21:09 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef SDIR_H
#define SDIR_H
#include "c.h"
/*
* ScanDirection was an int8 for no apparent reason. I kept the original
* values because I'm not sure if I'll break anything otherwise. -ay 2/95
*/
typedef enum ScanDirection {
BackwardScanDirection = -1,
NoMovementScanDirection = 0,
ForwardScanDirection = 1
} ScanDirection;
/*
* ScanDirectionIsValid --
* True iff scan direciton is valid.
*/
#define ScanDirectionIsValid(direction) \
((bool) (BackwardScanDirection <= direction && \
direction <= ForwardScanDirection))
/*
* ScanDirectionIsBackward --
* True iff scan direciton is backward.
*/
#define ScanDirectionIsBackward(direction) \
((bool) (direction == BackwardScanDirection))
/*
* ScanDirectionIsNoMovement --
* True iff scan direciton indicates no movement.
*/
#define ScanDirectionIsNoMovement(direction) \
((bool) (direction == NoMovementScanDirection))
/*
* ScanDirectionIsForward --
* True iff scan direciton is forward.
*/
#define ScanDirectionIsForward(direction) \
((bool) (direction == ForwardScanDirection))
#endif /* SDIR_H */
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