LocalAPBPtr local_apb_p = boost::make_shared<LocalAPB>(sql_connection);
HolidaysPtr holidays = boost::make_shared<DBHolidays>(sql_connection); // Error: Invalid argument.

class LocalAPB: public APB, public MsgDispatcher
{
public:
		virtual ~LocalAPB(){}
		LocalAPB(SqlDBConnectionPtr pSqlDBConnection): mpSqlDBConnection(pSqlDBConnection)
		{
				...
		};
		...
};

typedef boost::shared_ptr <LocalAPB> LocalAPBPtr;

////////////////////////////////

class Holidays
{
public:
	virtual void DefineHoliday(int Month, int Day) = 0;
	virtual void ClearHolidays(void) = 0;
	virtual bool IsHoliday(int Month, int Day) = 0;
	virtual ~Holidays(){};
};

class DBHolidays: public Holidays
{
public:
	DBHolidays(SqlDBConnectionPtr pSqlDBConnectionPtr)
	{
		...
	}
	...
};

typedef boost::shared_ptr<Holidays>HolidaysPtr;