blob: babfa0b20e10e2a90b4c6b311d842d5641f09266 (
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
58
59
60
61
62
63
|
/*-------------------------------------------------------------------------
*
* attnum.h
* POSTGRES attribute number definitions.
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: attnum.h,v 1.12 2001/01/24 19:43:19 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef ATTNUM_H
#define ATTNUM_H
/*
* user defined attribute numbers start at 1. -ay 2/95
*/
typedef int16 AttrNumber;
#define InvalidAttrNumber 0
/* ----------------
* support macros
* ----------------
*/
/*
* AttributeNumberIsValid
* True iff the attribute number is valid.
*/
#define AttributeNumberIsValid(attributeNumber) \
((bool) ((attributeNumber) != InvalidAttrNumber))
/*
* AttrNumberIsForUserDefinedAttr
* True iff the attribute number corresponds to an user defined attribute.
*/
#define AttrNumberIsForUserDefinedAttr(attributeNumber) \
((bool) ((attributeNumber) > 0))
/*
* AttrNumberGetAttrOffset
* Returns the attribute offset for an attribute number.
*
* Note:
* Assumes the attribute number is for an user defined attribute.
*/
#define AttrNumberGetAttrOffset(attNum) \
( \
AssertMacro(AttrNumberIsForUserDefinedAttr(attNum)), \
((attNum) - 1) \
)
/*
* AttributeOffsetGetAttributeNumber
* Returns the attribute number for an attribute offset.
*/
#define AttrOffsetGetAttrNumber(attributeOffset) \
((AttrNumber) (1 + attributeOffset))
#endif /* ATTNUM_H */
|
