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virtual longlong GetBigintValue(int n) = 0;
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virtual ulonglong GetUBigintValue(int n) = 0;
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virtual double GetFloatValue(int n) = 0;
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virtual void ReAlloc(void *mp, int n) {Blkp = mp; Nval = n;}
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virtual void Reset(int n) = 0;
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virtual bool SetFormat(PGLOBAL g, PSZ fmt, int len, int year = 0);