#ifndef busDate_H
#define busDate_H        

#include <vector>
#include "date.h"

#define DLLEXPORT __declspec(dllexport)

using namespace std;

typedef string HolCtr;
typedef vector<HolCtr> HolCtrs;

enum RollConv {
    NO_ROLL,        // no roll
    ROLL_FWD,        // roll forward until business day
    ROLL_BACK,        // roll backward until business day
    MOD_FOLLOW,        // while not month-end, roll forward until business day
                    //           otherwise, roll backwise until business day
};

class DLLEXPORT busDate : public date
{
protected:
    RollConv        roll;        // roll convention
    HolCtrs            holCtrs;    // holiday centers

public:
    // Constructors
    busDate(julianDate jDate = BAD_JDATE, RollConv rc = NO_ROLL, const HolCtrs* pHCs = NULL);
    busDate(int year, int month, int day, RollConv rc = NO_ROLL, const HolCtrs* pHCs = NULL);
    busDate(const date&, RollConv rc = NO_ROLL, const HolCtrs* pHCs = NULL);
    busDate(const busDate&);

    // Destructor
    virtual ~busDate();

    // Assignment
    busDate& operator=(const busDate& bDt);
    busDate& operator=(const julianDate& jDt);

    // Operators
    virtual void operator+=(int days);
    virtual void operator-=(int days);
    busDate& operator++();        // pre-increment
    busDate operator++(int);    // post-increment
    busDate& operator--();        // pre-decrement
    busDate operator--(int);    // post-decrement

    friend DLLEXPORT busDate operator+(const busDate& bDate, int n);
    friend DLLEXPORT busDate operator-(const busDate& bDate, int n);


    // Basic Operations
    virtual void rollBusDate();
    virtual void setYMD(int year, int month, int day);
    void addDays(int days);
    virtual void addMonths(int months);
    virtual void addYears(int years);
    virtual void setEOM();
    virtual bool isMonthEnd() const;
    long numBusDays(const busDate& endBD) const;

    // Roll convention operations
    RollConv getRollConv() const { return roll; }
    void setRollConv(RollConv);

    // Holiday center operations
    void setHolCtrs(const HolCtrs&);
    void delHolCtrs();
    const HolCtrs& getHolCtrs() const { return holCtrs; }

    // Other functions
    static bool isBusDay(julianDate jDt, const HolCtrs& hCs);
    static bool isMonthEnd(julianDate jDt, const HolCtrs& hCs);


    // Static functions to manipulate holidays
    static int initHolidays();
    static bool isHoliday(julianDate jDt, const HolCtrs& hCs);
    static int loadHolidays(const string fileName);
    static int addHoliday(const HolCtr hC, julianDate jholiday);
    static void clearHolidays();

};

#endif

我有上面的头文件，编译说不成功，好像是因为 我在 typedef string HolCtr; typedef vector<HolCtr> HolCtrs中用了 string；
我在前面加了 using namespace std 后 好像就可以了 ，但是有没有什么办法 不改 头文件， 不加std 解决？

能有办法 不改头文件么？