Viewing file:  sdir.h (1.43 KB) -rw-r--r--
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/*-------------------------------------------------------------------------
*
* sdir.h
* POSTGRES scan direction definitions.
*
*
* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/sdir.h
*
*-------------------------------------------------------------------------
*/
#ifndef SDIR_H
#define SDIR_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 direction is valid.
*/
#define ScanDirectionIsValid(direction) \
((bool) (BackwardScanDirection <= (direction) && \
(direction) <= ForwardScanDirection))
/*
* ScanDirectionIsBackward
* True iff scan direction is backward.
*/
#define ScanDirectionIsBackward(direction) \
((bool) ((direction) == BackwardScanDirection))
/*
* ScanDirectionIsNoMovement
* True iff scan direction indicates no movement.
*/
#define ScanDirectionIsNoMovement(direction) \
((bool) ((direction) == NoMovementScanDirection))
/*
* ScanDirectionIsForward
* True iff scan direction is forward.
*/
#define ScanDirectionIsForward(direction) \
((bool) ((direction) == ForwardScanDirection))
#endif /* SDIR_H */
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