bignumber.hpp

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#ifndef _Wolframe_TYPES_BIG_NUMBER_HPP_INCLUDED
#define _Wolframe_TYPES_BIG_NUMBER_HPP_INCLUDED
#include "types/integer.hpp"
#include <string>
#include <boost/shared_ptr.hpp>

namespace _Wolframe {
namespace types {

class Variant;

class BigNumber
{
public:
        BigNumber();
        BigNumber( const BigNumber& o);
        BigNumber( const Variant& v);
        BigNumber( double val);
        BigNumber( _WOLFRAME_INTEGER val);
        BigNumber( _WOLFRAME_UINTEGER val);
        BigNumber( const std::string& val);
        BigNumber( const char* val, std::size_t valsize);
        BigNumber( bool sign_, unsigned short precision_, signed short scale_, const unsigned char* digits_);
        ~BigNumber();

        unsigned short precision() const        {return m_size;}
        signed short scale() const              {return m_scale;}
        unsigned short size() const             {return m_size;}
        bool sign() const                       {return m_sign;}
        const unsigned char* digits() const     {return m_ar;}

        std::string tostring() const;
        std::string tostringNormalized() const;
        _WOLFRAME_INTEGER toint() const;
        _WOLFRAME_UINTEGER touint() const;
        double todouble() const;
        bool isvalid() const;

        bool operator==( const BigNumber& o) const      {return compare(o)==0;}
        bool operator!=( const BigNumber& o) const      {return compare(o)!=0;}
        bool operator>=( const BigNumber& o) const      {return compare(o)>=0;}
        bool operator> ( const BigNumber& o) const      {return compare(o)> 0;}
        bool operator<=( const BigNumber& o) const      {return compare(o)<=0;}
        bool operator< ( const BigNumber& o) const      {return compare(o)< 0;}

        int compare( const BigNumber& o) const;

private:
        void constructor( const std::string& val);
        void constructor( const char* val, std::size_t valsize);
        void constructor( const Variant& val);

        friend class BigNumberConst;
        enum ConstQualifier {ConstC};
        BigNumber( const ConstQualifier&, bool sign_, unsigned short precision_, signed short scale_, const unsigned char* digits_);

private:
        signed short m_scale;           
        bool m_sign;                    
        bool m_const;                   
        unsigned short m_size;          
        unsigned char* m_ar;            
};

class BigNumberConst
        :public BigNumber
{
public:
        BigNumberConst()
                :BigNumber(ConstC,false,0,0,0){}
        BigNumberConst( bool sign_, unsigned short precision_, signed short scale_, const unsigned char* digits_)
                :BigNumber(ConstC,sign_,precision_,scale_,digits_){}
        BigNumberConst( const BigNumberConst& o)
                :BigNumber(ConstC,o.sign(),o.precision(),o.scale(),o.digits()){}
};


}}//namespace
#endif