Method SubOne

extern/ttmath/ttmathint.h:339–346

! this method subtracts one from the value and returns carry */

		this method subtracts one from the value and returns carry
	*/
	uint SubOne()
	{
		bool p1_is_sign = IsSign();

		UInt<value_size>::SubOne();		

	return CorrectCarryAfterSubtracting(p1_is_sign, false);
	}


private: