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/*------------------------------------------------------------------------- * * attnum.h * POSTGRES attribute number definitions. * * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/access/attnum.h * *------------------------------------------------------------------------- */ #ifndef ATTNUM_H #define ATTNUM_H /* * user defined attribute numbers start at 1. -ay 2/95 */ typedef int16 AttrNumber; #define InvalidAttrNumber 0 #define MaxAttrNumber 32767 /* ---------------- * 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 a 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 */