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/*------------------------------------------------------------------------- * * datum.h * POSTGRES Datum (abstract data type) manipulation routines. * * These routines are driven by the 'typbyval' and 'typlen' information, * which must previously have been obtained by the caller for the datatype * of the Datum. (We do it this way because in most situations the caller * can look up the info just once and use it for many per-datum operations.) * * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/utils/datum.h * *------------------------------------------------------------------------- */ #ifndef DATUM_H #define DATUM_H /* * datumGetSize - find the "real" length of a datum */ extern Size datumGetSize(Datum value, bool typByVal, int typLen); /* * datumCopy - make a copy of a datum. * * If the datatype is pass-by-reference, memory is obtained with palloc(). */ extern Datum datumCopy(Datum value, bool typByVal, int typLen); /* * datumFree - free a datum previously allocated by datumCopy, if any. * * Does nothing if datatype is pass-by-value. */ extern void datumFree(Datum value, bool typByVal, int typLen); /* * datumIsEqual * return true if two datums of the same type are equal, false otherwise. * * XXX : See comments in the code for restrictions! */ extern bool datumIsEqual(Datum value1, Datum value2, bool typByVal, int typLen); #endif /* DATUM_H */