decimal.h

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// OSB library ************************************************ -*- C++ -*-
/*
  AUTHOR(S): Vipul Gupta (vg)

  RCS information
   $Name: OSB_060808 $
   $Revision: 1.38 $

  License
   OSB rating and billing library for communication networks
   Copyright (C) 2004, 2005, 2006  OSB systems

   This file may be distributed and/or modify under the terms of the
   GNU General Public License (GPL) as published by the Free Software
   Foundation which is provided in the file LICENSE.GPL included in the
   packaging of this file.

   The file is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   for more details.

   Holders of a OSB Commercial License may use this file under the terms
   and conditions of this commercial license.
 */
#ifndef _DECIMAL_H_
#define _DECIMAL_H_

// *********************************************************************
// included header files
// + standard includes
#include <string>
#include <iosfwd>
#include <utility>
#include <cmath>
#include <limits>

// + local headers
#include "osberror.h"

// *********************************************************************
// namespace extensions
namespace OSB_LIB {

    class Decimal
    {
        friend class RoundUp;
        friend bool operator==(const Decimal&, const Decimal&);
        friend bool operator!=(const Decimal&, const Decimal&);
        friend bool operator<(const Decimal&, const Decimal&);
        friend bool operator>(const Decimal&, const Decimal&);
        friend bool operator<=(const Decimal&, const Decimal&);
        friend bool operator>=(const Decimal&, const Decimal&);

    public:
        static const long long valueMax = 0x7fffffffffffffffLL;
        static const long long valueMin = ~valueMax;

    public:
        Decimal() { value_ = 0; }
        Decimal(int v) { value_ = longToDecimal(v); }
        Decimal(long v) { value_ = longToDecimal(v); }
        Decimal(long long v) { value_ = longToDecimal(v); }
        Decimal(double v) { value_ = doubleToDecimal(v); }
        Decimal(const Decimal& d) : value_(d.value_) {}
        Decimal& operator=(const Decimal&);
        Decimal& operator-();

        double toDouble() const;

        double frac() const;

        long trunc() const;
        long ceil() const;

        std::string str() const;

        Decimal& operator+=(const Decimal&);
        Decimal& operator-=(const Decimal&);
        Decimal& operator*=(const Decimal&);
        Decimal& operator/=(const Decimal&);
        static long power() { return power_; }
        static int precision(int p =-1);     //Retreive the old precision
                                             // and set the new precision

    private:
        long long doubleToDecimal(double);   //Convert double to
                                             //"Decimal"

        long long longToDecimal(long long);  //Convert long or
                                             //int to "Decimal"

        static int precision_;               //Number of digits after the
                                             //decimal,of the "value_"
                                             //to be displayed after the
                                             //rounding has been done.

        static long power_;                  //Value required to convert
                                             //a double, long or integer
                                             //value to a "Decimal"

        long long value_;                    //The value of a
                                             //Decimal Object.
    };

    inline Decimal operator++(Decimal&);            //prefix operator
    inline Decimal operator--(Decimal&);
    inline Decimal operator++(Decimal&, int);       //postfix operator
    inline Decimal operator--(Decimal&, int);
    inline Decimal operator*(const Decimal&, const Decimal&);
    inline Decimal operator/(const Decimal&, const Decimal&);
    inline Decimal operator+(const Decimal&, const Decimal&);
    inline Decimal operator-(const Decimal&, const Decimal&);

    std::ostream& operator<<(std::ostream&, const Decimal&);

    inline Decimal& Decimal::operator=(const Decimal& d)
    {
        if (this != &d) value_ = d.value_;
        return *this;
    }

    inline Decimal& Decimal::operator-()
    {
        value_ *= -1;
        return *this;
    }

    inline Decimal operator+(const Decimal& d1, const Decimal& d2)
    {
        Decimal r(d1);
        return r += d2;
    }

    inline Decimal operator-(const Decimal& d1, const Decimal& d2)
    {
        Decimal r(d1);
        return r -= d2;
    }

    inline Decimal operator*(const Decimal& d1, const Decimal& d2)
    {
        Decimal r(d1);
        return r *= d2;
    }

    inline Decimal operator/(const Decimal& d1, const Decimal& d2)
    {
        Decimal r(d1);
        return r /= d2;
    }

    inline Decimal operator++(Decimal& d)
    {
        return d += 1;
    }

    inline Decimal operator++(Decimal& d, int)
    {
        Decimal r = d;
        d += 1;
        return r;
    }

    inline Decimal operator--(Decimal& d, int)
    {
        Decimal r = d;
        d -= 1;
        return r;
    }

    inline Decimal operator--(Decimal& d)
    {
        return d -= 1;
    }

    inline bool operator==(const Decimal& d1, const Decimal& d2)
    {
        return d1.value_ == d2.value_;
    }

    inline bool operator!=(const Decimal& d1, const Decimal& d2)
    {
        return d1.value_ != d2.value_;
    }

    inline bool operator<(const Decimal& d1, const Decimal& d2)
    {
        return d1.value_ < d2.value_;
    }

    inline bool operator>(const Decimal& d1, const Decimal& d2)
    {
        return d1.value_ > d2.value_;
    }

    inline bool operator<=(const Decimal& d1, const Decimal& d2)
    {
        return d1.value_ <= d2.value_;
    }

    inline bool operator>=(const Decimal& d1, const Decimal& d2)
    {
        return d1.value_ >= d2.value_;
    }
}                                   // namespace OSB_LIB
#endif                              // #ifndef _DECIMAL_H_

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