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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc to all files copyright Regents of Berkeley. Man, that's a lot of files.
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* sdir.h
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* POSTGRES scan direction definitions.
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*
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*
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: sdir.h,v 1.7 2000/01/26 05:57:51 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SDIR_H
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#define SDIR_H
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/*
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* ScanDirection was an int8 for no apparent reason. I kept the original
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* values because I'm not sure if I'll break anything otherwise. -ay 2/95
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*/
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typedef enum ScanDirection
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{
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BackwardScanDirection = -1,
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NoMovementScanDirection = 0,
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ForwardScanDirection = 1
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} ScanDirection;
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/*
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* ScanDirectionIsValid
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* True iff scan direction is valid.
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*/
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#define ScanDirectionIsValid(direction) \
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((bool) (BackwardScanDirection <= direction && \
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direction <= ForwardScanDirection))
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/*
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* ScanDirectionIsBackward
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* True iff scan direction is backward.
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*/
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#define ScanDirectionIsBackward(direction) \
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((bool) (direction == BackwardScanDirection))
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/*
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* ScanDirectionIsNoMovement
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* True iff scan direction indicates no movement.
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*/
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#define ScanDirectionIsNoMovement(direction) \
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((bool) (direction == NoMovementScanDirection))
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/*
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* ScanDirectionIsForward
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* True iff scan direction is forward.
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*/
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#define ScanDirectionIsForward(direction) \
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((bool) (direction == ForwardScanDirection))
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#endif /* SDIR_H */
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