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/*------------------------------------------------------------------------- * * numeric.h * Definitions for the exact numeric data type of Postgres * * Original coding 1998, Jan Wieck. Heavily revised 2003, Tom Lane. * * Copyright (c) 1998-2012, PostgreSQL Global Development Group * * src/include/utils/numeric.h * *------------------------------------------------------------------------- */ #ifndef _PG_NUMERIC_H_ #define _PG_NUMERIC_H_ #include "fmgr.h" /* * Limit on the precision (and hence scale) specifiable in a NUMERIC typmod. * Note that the implementation limit on the length of a numeric value is * much larger --- beware of what you use this for! */ #define NUMERIC_MAX_PRECISION 1000 /* * Internal limits on the scales chosen for calculation results */ #define NUMERIC_MAX_DISPLAY_SCALE NUMERIC_MAX_PRECISION #define NUMERIC_MIN_DISPLAY_SCALE 0 #define NUMERIC_MAX_RESULT_SCALE (NUMERIC_MAX_PRECISION * 2) /* * For inherently inexact calculations such as division and square root, * we try to get at least this many significant digits; the idea is to * deliver a result no worse than float8 would. */ #define NUMERIC_MIN_SIG_DIGITS 16 /* The actual contents of Numeric are private to numeric.c */ struct NumericData; typedef struct NumericData *Numeric; /* * fmgr interface macros */ #define DatumGetNumeric(X) ((Numeric) PG_DETOAST_DATUM(X)) #define DatumGetNumericCopy(X) ((Numeric) PG_DETOAST_DATUM_COPY(X)) #define NumericGetDatum(X) PointerGetDatum(X) #define PG_GETARG_NUMERIC(n) DatumGetNumeric(PG_GETARG_DATUM(n)) #define PG_GETARG_NUMERIC_COPY(n) DatumGetNumericCopy(PG_GETARG_DATUM(n)) #define PG_RETURN_NUMERIC(x) return NumericGetDatum(x) /* * Utility functions in numeric.c */ extern bool numeric_is_nan(Numeric num); int32 numeric_maximum_size(int32 typmod); extern char *numeric_out_sci(Numeric num, int scale); #endif /* _PG_NUMERIC_H_ */