Decimal.h

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// Copyright Onix Solutions Limited [OnixS]. All rights reserved.
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#pragma once
 
#include <string>
 
#include <OnixS/CboeCFE/Trading/BOE/Integral.h>
 
namespace OnixS
{
    namespace CboeCFE
    {
        namespace Trading
        {
            namespace BOE
            {

                template<class MantissaType, class ExponentType>
                class FixedPointDecimal
                {
                    // Only mantissa is stored. 
                    MantissaType mantissa_;
 
                public:
                    typedef MantissaType Mantissa;

                    typedef ExponentType Exponent;

                    enum
                    {
                        Size = sizeof(Mantissa)
                    };

                    FixedPointDecimal()
                        : mantissa_()
                    {
                    }

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

                    FixedPointDecimal(const FixedPointDecimal& other)
                        : mantissa_(other.mantissa_)
                    {
                    }

                    Mantissa mantissa() const
                    {
                        return mantissa_;
                    }

                    ONIXS_BATS_BOE_CONSTEXPR
                    Exponent exponent() const
                    {
                        return Exponent();
                    }

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

                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();
                }

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

                template <class Mantissa, class Exponent>
                inline void toStr(std::string& str, const FixedPointDecimal <Mantissa, Exponent>& number)
                {
                    decimalToStr(str, number.mantissa(), static_cast<Int32>(number.exponent()));
                }

                template<class Mantissa, class Exponent>
                inline std::string toStr(const FixedPointDecimal<Mantissa, Exponent>& number)
                {
                    std::string str;
 
                    toStr(str, number);
 
                    return str;
                }
 
                // Serializes fixed-point decimal to stream
                template<class Mantissa, class Exponent>
                std::ostream& operator << (std::ostream& stream, const FixedPointDecimal<Mantissa, Exponent>& number)
                {
                    return stream << toStr(number);
                }
            }
        }
    }
}