Decimal.h

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// Copyright Onix Solutions Limited [OnixS]. All rights reserved.
//
// This software owned by Onix Solutions Limited [OnixS] and is
// protected by copyright law and international copyright treaties.
//
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// agreements granting a non-assignable, non-transferable and non-exclusive license
// to use the software for it's own data processing purposes under the terms defined
// in the Agreement.
//
// Except as otherwise granted within the terms of the Agreement, copying or
// reproduction of any part of this source code or associated reference material
// to any other location for further reproduction or redistribution, and any
// amendments to this copyright notice, are expressly prohibited.
//
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// accordance with the terms of the Agreement is a violation of copyright law.
//
 
#pragma once
 
#include <string>
 
#include <OnixS/CME/MDH/Integral.h>
 
ONIXS_CMEMDH_NAMESPACE_BEGIN

template <class MantissaType, class ExponentType>
class FixedPointDecimal
{
public:
    typedef MantissaType Mantissa;

    typedef ExponentType Exponent;

    enum
    {
        Size = sizeof(Mantissa)
    };

    FixedPointDecimal()
        : mantissa_()
    {
    }

    explicit FixedPointDecimal(Mantissa mantissa)
        : mantissa_(mantissa)
    {
    }

    Mantissa mantissa() const
    {
        return mantissa_;
    }

    Exponent exponent() const
    {
        return Exponent();
    }
 
private:
    // Only mantissa is stored.
    MantissaType mantissa_;
};

template <class Mantissa, class Exponent>
bool operator==(const FixedPointDecimal<Mantissa, Exponent>& left, const FixedPointDecimal<Mantissa, Exponent>& right)
{
    return (left.mantissa() == right.mantissa());
}

template <class Mantissa, class Exponent>
bool operator!=(const FixedPointDecimal<Mantissa, Exponent>& left, const FixedPointDecimal<Mantissa, Exponent>& right)
{
    return (left.mantissa() != right.mantissa());
}

template <class Mantissa, class Exponent>
bool operator<(const FixedPointDecimal<Mantissa, Exponent>& left, const FixedPointDecimal<Mantissa, Exponent>& right)
{
    return (left.mantissa() < right.mantissa());
}

template <class Mantissa, class Exponent>
bool operator>(const FixedPointDecimal<Mantissa, Exponent>& left, const FixedPointDecimal<Mantissa, Exponent>& right)
{
    return (left.mantissa() > right.mantissa());
}

template <class Mantissa, class Exponent>
bool operator<=(const FixedPointDecimal<Mantissa, Exponent>& left, const FixedPointDecimal<Mantissa, Exponent>& right)
{
    return (left.mantissa() <= right.mantissa());
}

template <class Mantissa, class Exponent>
bool operator>=(const FixedPointDecimal<Mantissa, Exponent>& left, const FixedPointDecimal<Mantissa, Exponent>& right)
{
    return (left.mantissa() >= right.mantissa());
}

typedef Int64 DecimalMantissa;

typedef Int32 DecimalExponent;

class ONIXS_CMEMDH_LTWT Decimal
{
public:
    typedef DecimalMantissa Mantissa;

    typedef DecimalExponent Exponent;

    Decimal()
        : mantissa_(0)
        , exponent_(0)
    {
    }

    Decimal(Mantissa mantissa, Exponent exponent)
        : mantissa_(mantissa)
        , exponent_(exponent)
    {
    }

    Decimal(const Decimal& other)
        : mantissa_(other.mantissa_)
        , exponent_(other.exponent_)
    {
    }

    template <class AMantissa, class AExponent>
    Decimal(const FixedPointDecimal<AMantissa, AExponent>& other)
        : mantissa_(other.mantissa())
        , exponent_(other.exponent())
    {
    }

    Mantissa mantissa() const
    {
        return mantissa_;
    }

    Exponent exponent() const
    {
        return exponent_;
    }

    Decimal& operator=(const Decimal& other)
    {
        mantissa_ = other.mantissa_;
        exponent_ = other.exponent_;
 
        return *this;
    }

    template <class AMantissa, class AExponent>
    Decimal& operator=(const FixedPointDecimal<AMantissa, AExponent>& other)
    {
        mantissa_ = other.mantissa();
        exponent_ = other.exponent();
 
        return *this;
    }
 
private:
    DecimalMantissa mantissa_;
    DecimalExponent exponent_;
};

ONIXS_CMEMDH_EXPORTED
bool decimalEqual(const Decimal& left, const Decimal& right);

inline bool operator==(const Decimal& left, const Decimal& right)
{
    return ((left.exponent() == right.exponent()) ? (left.mantissa() == right.mantissa()) : decimalEqual(left, right));
}

inline bool operator!=(const Decimal& left, const Decimal& right)
{
    return ((left.exponent() == right.exponent()) ? (left.mantissa() != right.mantissa()) : !decimalEqual(left, right));
}

template <class Mantissa, class Exponent>
inline bool operator==(const Decimal& left, const FixedPointDecimal<Mantissa, Exponent>& right)
{
    return (left == Decimal(right));
}

template <class Mantissa, class Exponent>
inline bool operator==(const FixedPointDecimal<Mantissa, Exponent>& left, const Decimal& right)
{
    return (Decimal(left) == right);
}

template <class Mantissa, class Exponent>
inline bool operator!=(const Decimal& left, const FixedPointDecimal<Mantissa, Exponent>& right)
{
    return (left != Decimal(right));
}

template <class Mantissa, class Exponent>
inline bool operator!=(const FixedPointDecimal<Mantissa, Exponent>& left, const Decimal& right)
{
    return (Decimal(left) != right);
}

ONIXS_CMEMDH_EXPORTED
bool decimalLess(const Decimal& left, const Decimal& right);

inline bool operator<(const Decimal& left, const Decimal& right)
{
    return ((left.exponent() == right.exponent()) ? (left.mantissa() < right.mantissa()) : decimalLess(left, right));
}

inline bool operator>(const Decimal& left, const Decimal& right)
{
    return (right < left);
}

inline bool operator<=(const Decimal& left, const Decimal& right)
{
    return !(right < left);
}

inline bool operator>=(const Decimal& left, const Decimal& right)
{
    return !(right > left);
}

template <class Mantissa, class Exponent>
inline bool operator<(const Decimal& left, const FixedPointDecimal<Mantissa, Exponent>& right)
{
    return (left < Decimal(right));
}

template <class Mantissa, class Exponent>
inline bool operator<(const FixedPointDecimal<Mantissa, Exponent>& left, const Decimal& right)
{
    return (Decimal(left) < right);
}

template <class Mantissa, class Exponent>
inline bool operator>(const Decimal& left, const FixedPointDecimal<Mantissa, Exponent>& right)
{
    return (left > Decimal(right));
}

template <class Mantissa, class Exponent>
inline bool operator>(const FixedPointDecimal<Mantissa, Exponent>& left, const Decimal& right)
{
    return (Decimal(left) > right);
}

ONIXS_CMEMDH_EXPORTED
bool fromStr(Decimal&, const Char*, size_t);

ONIXS_CMEMDH_EXPORTED
void decimalToStr(std::string&, Int64, Int32);

inline void toStr(std::string& str, const Decimal& number)
{
    decimalToStr(str, number.mantissa(), number.exponent());
}

inline std::string toStr(const Decimal& number)
{
    std::string str;
 
    toStr(str, number);
 
    return str;
}

template <class Mantissa, class Exponent>
inline void toStr(std::string& str, const FixedPointDecimal<Mantissa, Exponent>& number)
{
    toStr(str, Decimal(number));
}

template <class Mantissa, class Exponent>
inline std::string toStr(const FixedPointDecimal<Mantissa, Exponent>& number)
{
    std::string str;
 
    toStr(str, number);
 
    return str;
}
 
ONIXS_CMEMDH_NAMESPACE_END