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
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// amendments to this copyright notice, are expressly prohibited.
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#pragma once
 
#include <OnixS/CME/MDH/messaging/Integral.h>
#include <OnixS/CME/MDH/messaging/Memory.h>
 
#include <string>
 
ONIXS_CMEMDH_MESSAGING_NAMESPACE_BEGIN

template <class MantissaType, class ExponentType> class FixedPointDecimal;
template <class MantissaType, class ExponentType> class FloatingPointDecimal;
template <class Mantissa, class Exponent> std::string toStr(const FixedPointDecimal<Mantissa, Exponent>&);
template <class Mantissa, class Exponent> std::string toStr(const FloatingPointDecimal<Mantissa, Exponent>&);

template <class MantissaType, class ExponentType>
class FloatingPointDecimal
{
    MantissaType mantissa_;
    ExponentType exponent_;
 
public:
    struct MemberTraits
    {
        enum
        {
            Count = 2
        };
 
        typedef MantissaType FirstArgType;
 
        typedef ExponentType SecondArgType;
    };

    typedef MantissaType Mantissa;

    typedef ExponentType Exponent;

    enum
    {
        Size = sizeof(Mantissa) + sizeof(Exponent)
    };

    ONIXS_CMEMDH_NODISCARD
    std::string toString() const
    {
        return toStr(*this);
    }

    constexpr FloatingPointDecimal() noexcept
        : mantissa_()
        , exponent_()
    {
    }

    constexpr FloatingPointDecimal(Mantissa mantissa, Exponent exponent) noexcept
        : mantissa_(mantissa)
        , exponent_(exponent)
    {
    }

    constexpr FloatingPointDecimal(const FloatingPointDecimal& other) noexcept
        : mantissa_(other.mantissa_)
        , exponent_(other.exponent_)
    {
    }

    Mantissa mantissa() const noexcept
    {
        return mantissa_;
    }

    Exponent exponent() const noexcept
    {
        return exponent_;
    }

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

    template <class OtherMantissa, class OtherExponent>
    explicit FloatingPointDecimal(const FloatingPointDecimal<OtherMantissa, OtherExponent>& other) noexcept
        : mantissa_(other.mantissa())
        , exponent_(other.exponent())
    {
    }

    template <class OtherMantissa, class OtherExponent>
    explicit FloatingPointDecimal(const FixedPointDecimal<OtherMantissa, OtherExponent>& other) noexcept
        : mantissa_(other.mantissa())
        , exponent_(other.exponent())
    {
    }

    template <class OtherMantissa, class OtherExponent>
    FloatingPointDecimal& operator=(const FloatingPointDecimal<OtherMantissa, OtherExponent>& other) noexcept
    {
        mantissa_ = other.mantissa();
        exponent_ = other.exponent();
 
        return *this;
    }

    template <class OtherMantissa, class OtherExponent>
    FloatingPointDecimal& operator=(const FixedPointDecimal<OtherMantissa, OtherExponent>& other) noexcept
    {
        mantissa_ = other.mantissa();
        exponent_ = other.exponent();
 
        return *this;
    }

    void serialize(void* addr) const noexcept
    {
        assert(addr);
 
        std::memcpy(addr, &mantissa_, sizeof(mantissa_));
        addr = advanceByBytes(addr, sizeof(mantissa_));
 
        std::memcpy(addr, &exponent_, sizeof(exponent_));
    }
};

template <class MantissaType, class ExponentType>
class FixedPointDecimal
{
    // Only mantissa is stored.
    MantissaType mantissa_;
 
public:
    struct MemberTraits
    {
        enum
        {
            Count = 1
        };
 
        typedef MantissaType FirstArgType;
    };

    typedef MantissaType Mantissa;

    typedef ExponentType Exponent;

    enum
    {
        Size = sizeof(Mantissa)
    };

    ONIXS_CMEMDH_NODISCARD
    std::string toString() const
    {
        return toStr(*this);
    }

    constexpr FixedPointDecimal() noexcept
        : mantissa_()
    {
    }

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

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

    Mantissa mantissa() const noexcept
    {
        return mantissa_;
    }

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

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

    void serialize(void* addr) const noexcept
    {
        assert(addr);
 
        std::memcpy(addr, &mantissa_, sizeof(mantissa_));
    }
};
 
ONIXS_CMEMDH_MESSAGING_NAMESPACE_END