1996-08-27 23:50:29 +02:00
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/*-------------------------------------------------------------------------
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*
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* attnum.h--
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* POSTGRES attribute number definitions.
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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1996-10-31 10:51:30 +01:00
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* $Id: attnum.h,v 1.4 1996/10/31 09:46:35 scrappy Exp $
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1996-08-27 23:50:29 +02:00
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef ATTNUM_H
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#define ATTNUM_H
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1996-10-31 06:58:01 +01:00
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1996-08-27 23:50:29 +02:00
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/*
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* user defined attribute numbers start at 1. -ay 2/95
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*/
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typedef int16 AttrNumber;
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#define InvalidAttrNumber 0
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/* ----------------
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* support macros
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* ----------------
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*/
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/*
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* AttributeNumberIsValid --
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* True iff the attribute number is valid.
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*/
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#define AttributeNumberIsValid(attributeNumber) \
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((bool) ((attributeNumber) != InvalidAttrNumber))
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/*
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* AttrNumberIsForUserDefinedAttr --
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* True iff the attribute number corresponds to an user defined attribute.
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*/
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#define AttrNumberIsForUserDefinedAttr(attributeNumber) \
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((bool) ((attributeNumber) > 0))
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/*
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* AttrNumberGetAttrOffset --
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* Returns the attribute offset for an attribute number.
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*
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* Note:
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* Assumes the attribute number is for an user defined attribute.
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*/
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#define AttrNumberGetAttrOffset(attNum) \
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(AssertMacro(AttrNumberIsForUserDefinedAttr(attNum)) ? \
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((attNum - 1)) : 0)
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/*
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* AttributeOffsetGetAttributeNumber --
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* Returns the attribute number for an attribute offset.
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*/
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#define AttrOffsetGetAttrNumber(attributeOffset) \
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((AttrNumber) (1 + attributeOffset))
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#endif /* ATTNUM_H */
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