Method ChangeSign

extern/ttmath/ttmathint.h:105–127

! we change the sign of the value if it isn't possible to change the sign this method returns 1 else return 0 and changing the sign */

		else return 0 and changing the sign
	*/
	uint ChangeSign()
	{
		/*
			if the value is equal that one which has been returned from SetMin
			(only the highest bit is set) that means we can't change sign
			because the value is too big (bigger about one)

			e.g. when value_size = 1 and value is -2147483648 we can't change it to the
			2147483648 because the max value which can be held is 2147483647

			we don't change the value and we're using this fact somewhere in some methods
			(if we look on our value without the sign we get the correct value 
			eg. -2147483648 in Int<1> will be 2147483648 on the UInt<1> type)
		*/
		if( UInt<value_size>::IsOnlyTheHighestBitSet() )
			return 1;

		UInt<value_size> temp(*this);
		UInt<value_size>::SetZero();
		UInt<value_size>::Sub(temp);

	return 0;
	}