/
ConvertingNumber.h
107 lines (101 loc) · 3.98 KB
/
ConvertingNumber.h
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#pragma once
#include "Number.h"
#include "Exceptions.h"
#include <memory>
using std::auto_ptr;
typedef int NumberConvertLevel;
class AbstractConvertingNumber : public Number
{
public:
virtual NumberConvertLevel ConvertLevel() = 0;
virtual auto_ptr<AbstractConvertingNumber> Convert(Number *number) = 0;
};
template <class ImplementedNumber, NumberConvertLevel Level,
class PlusResult = Number, class TimesResult = Number, class PowerResult = Number,
class BaseClass = AbstractConvertingNumber>
class ConvertingNumber : public BaseClass
{
protected:
virtual auto_ptr<ImplementedNumber> DoConvert(Number *number) = 0;
virtual auto_ptr<PlusResult> Plus(ImplementedNumber *number) = 0;
virtual auto_ptr<TimesResult> Times(ImplementedNumber *number) = 0;
virtual auto_ptr<PowerResult> Power(ImplementedNumber *number) = 0;
virtual CompareResult Compare(ImplementedNumber *number) = 0;
virtual NumberConvertLevel ConvertLevel()
{
return Level;
}
public:
virtual NumberPtr Plus(Number *number)
{
AbstractConvertingNumber *convertingNumber(dynamic_cast<AbstractConvertingNumber*>(number));
if(!convertingNumber)
throw NumberException("Inconvertible number.");
NumberConvertLevel level1(ConvertLevel());
NumberConvertLevel level2(convertingNumber->ConvertLevel());
if(level1 < level2)
// convert this to type of number
return convertingNumber->Convert(this)->Plus(convertingNumber);
else if(level1 > level2)
// convert number to type of this
return Plus(Convert(convertingNumber).get());
else
// no conversion necessary
return NumberPtr(Plus(dynamic_cast<ImplementedNumber*>(convertingNumber)));
}
virtual NumberPtr Times(Number *number)
{
AbstractConvertingNumber *convertingNumber(dynamic_cast<AbstractConvertingNumber*>(number));
if(!convertingNumber)
throw NumberException("Inconvertible number.");
NumberConvertLevel level1(ConvertLevel());
NumberConvertLevel level2(convertingNumber->ConvertLevel());
if(level1 < level2)
// convert this to type of number
return convertingNumber->Convert(this)->Times(convertingNumber);
else if(level1 > level2)
// convert number to type of this
return Times(Convert(convertingNumber).get());
else
// no conversion necessary
return NumberPtr(Times(dynamic_cast<ImplementedNumber*>(convertingNumber)));
}
virtual NumberPtr Power(Number *number)
{
AbstractConvertingNumber *convertingNumber(dynamic_cast<AbstractConvertingNumber*>(number));
if(!convertingNumber)
throw NumberException("Inconvertible number.");
NumberConvertLevel level1(ConvertLevel());
NumberConvertLevel level2(convertingNumber->ConvertLevel());
if(level1 < level2)
// convert this to type of number
return convertingNumber->Convert(this)->Power(convertingNumber);
else if(level1 > level2)
// convert number to type of this
return Power(Convert(convertingNumber).get());
else
// no conversion necessary
return NumberPtr(Power(dynamic_cast<ImplementedNumber*>(convertingNumber)));
}
virtual CompareResult Compare(Number *number)
{
AbstractConvertingNumber *convertingNumber(dynamic_cast<AbstractConvertingNumber*>(number));
if(!convertingNumber)
throw NumberException("Inconvertible number.");
NumberConvertLevel level1(ConvertLevel());
NumberConvertLevel level2(convertingNumber->ConvertLevel());
if(level1 < level2)
// convert this to type of number
return convertingNumber->Convert(this)->Compare(convertingNumber);
else if(level1 > level2)
// convert number to type of this
return Compare(Convert(convertingNumber).get());
else
// no conversion necessary
return Compare(dynamic_cast<ImplementedNumber*>(convertingNumber));
}
virtual auto_ptr<AbstractConvertingNumber> Convert(Number *number)
{
return auto_ptr<AbstractConvertingNumber>(DoConvert(number));
}
};