blob: 4f317f5eb03dfabfe5560e426ea63b0b1e463c9e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
/*-------------------------------------------------------------------------
*
* sdir.h
* POSTGRES scan direction definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: sdir.h,v 1.6 1999/05/25 16:13:34 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#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 */
|
