明明已经在title类里面重载了<<为何编译器还是提示没有操作符与其匹配？求救大佬😭

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#include <iostream>
#include<string>
#include<fstream>
using namespace std;
class title
{
protected:
    enum { MANAGER = 0, HUMAN_SPECIALIST, FINANCIAL_SPECIALIST, SALES_SPECIALIST, ADMINISTRATIVE_SPECIALIST };
    static double Salary[5];

    std::string title_name;
    size_t salary_index;

public:
    title(std::string tn, size_t index) : title_name(tn), salary_index(index) {}
    title(){}
    ~title() {}
    title(const title& t) : title_name(t.title_name), salary_index(t.salary_index) {}
    title& operator=(const title& t)
    {
        title_name = t.title_name;
        salary_index = t.salary_index;
        return *this;
    }
    static void change_Salary(double new_salary, int position);
    friend istream& operator>>(istream& in, title& mytitle);
    friend ostream& operator<<(ostream& out, title& mytitle);
    friend ofstream& operator<<(ofstream& outfile,  title& mytitle);
    
    friend class Employee;
};
double title::Salary[5] = { 5000,3000,3000,3000,3000 };

istream& operator>>(istream& in, title& mytitle)
{
    in >> mytitle.title_name >> title::Salary[mytitle.salary_index];
    return in;
}

ostream& operator<<(ostream& out, title& mytitle)
{
    out<< mytitle.title_name <<" "<< title::Salary[mytitle.salary_index];
    return out;
}

ofstream& operator<<(ofstream& out, title& mytitle)
{
    out << mytitle.title_name << " " << title::Salary[mytitle.salary_index];
    return out;
}

void title::change_Salary(double new_salary, int position)
{
   Salary[position] = new_salary;

    std::cout << "changed Salary list" << std::endl;
    std::cout << "manager: " <<Salary[0] << " ; ";
    std::cout << "human_specialist: " << Salary[1] << " ; ";
    std::cout << "financial_specialist: " << Salary[2] << " ; ";
    std::cout << "sales_specialist: " << Salary[3] << " ; ";
    std::cout << "administrative_specialist: " << Salary[4] << std::endl;

}

class manager : public title
{
public:
    manager() : title("Manager", title::MANAGER) {}
    ~manager() {}
};

class human_specialist : public title
{
public:
    human_specialist() : title("Human_specialist", title::HUMAN_SPECIALIST) {}
    ~human_specialist() {}
};

class financial_specialist : public title
{
public:
    financial_specialist() : title("Financial_specialist", title::FINANCIAL_SPECIALIST) {}
    ~financial_specialist() {}
};

class sales_specialist : public title
{
public:
    sales_specialist() : title("Sales_specialist", title::SALES_SPECIALIST) {}
    ~sales_specialist() {}
};

class administrative_specialist : public title
{
public:
    administrative_specialist() : title("Administrative_specialist", title::ADMINISTRATIVE_SPECIALIST) {}
    ~administrative_specialist() {}
};

class Employee
{

    friend ostream& operator<<(ostream&, const Employee*);
    friend istream& operator>>(istream&, Employee*);
    friend ofstream& operator<<(ofstream&, const Employee*);
    friend ifstream& operator>>(ifstream&, Employee*);
protected:
    std::string eid, name, sex, dob, doe, unit;
    title mytitle;

public:
    Employee(std::string e, std::string n, std::string s, std::string db, std::string de, std::string u, const title& mt) : eid(e), name(n), sex(s), dob(db), doe(de), unit(u), mytitle(mt) {}
    ~Employee() {}
    Employee(const Employee& em) : eid(em.eid), name(em.name), sex(em.sex), dob(em.dob), doe(em.doe), unit(em.unit), mytitle(em.mytitle) {}
    void information()
    {
        std::cout << "eid: " << eid << " ; " << "name: " << name << " ; ";
        std::cout << "sex: " << sex << " ; " << "dob: " << dob << " ; ";
        std::cout << "doe: " << doe << " ; " << "unit: " << unit << " ; ";
        std::cout << "title: " << mytitle.title_name << " ; " << "salary: " << title::Salary[mytitle.salary_index] << std::endl;
    }
};

istream& operator>>(istream& input, Employee* employee)//重载输入 
{
    cout << "请输入职工编号:\n" << endl;
    input >> employee->eid;
    cout << "请输入职工姓名：" << endl;
    input >> employee->name;
    cout << "请输入职工性别" << endl;
    input >> employee->sex;
    cout << "请输入出生年月日" << endl;
    input >> employee->dob;
    cout << "请输入入职日期" << endl;
    input >> employee->doe;
    cout <<"请输入职工部门:" <<endl;
    input>>employee->unit;
    cout << "请输入职工职称和薪资：" << endl;
    input >> employee->mytitle;
    return input;
}

ostream& operator<<(ostream& output, const Employee* employee)//重载输出 
{
    output << "职工编号：" << employee->eid << "  职工姓名：" << employee->name
        << " 职工性别：" << employee->sex << " 职工出生日期：" << employee->dob << " 职工入职日期: " << employee->doe << " 职工职称与薪资：";
    output << employee->mytitle << endl;
    return output;
}
ofstream& operator<<(ofstream& outEmployee, const Employee* employee)//向文件中写信息的重载 
{
    outEmployee << "职工编号：" << employee->eid << "  职工姓名：" << employee->name
        << " 职工性别：" << employee->sex << " 职工出生日期：" << employee->dob << " 职工入职日期: " << employee->doe << " 职工职称与薪资：";
    outEmployee << employee->mytitle << endl;
    return outEmployee;
}

ifstream& operator>>(ifstream& in, Employee* Employees)//从文件中读取信息的重载 
{
    int index;
    std::string eid, name, sex, dob, doe, unit;
    title mytitle;
    in >> eid >> name >> sex >> dob >> doe >> unit >>mytitle;
    if (in)
    {
        Employees->eid=eid;
        Employees->name=name;
        Employees->sex=sex;
        Employees->dob=dob;
        Employees->doe=doe;
        Employees->unit=unit;
        Employees->mytitle=mytitle;
    }
    return  in;
}

const manager TITLE_MANAGER;
const human_specialist TITLE_HUMAN_SPECIALIST;
const financial_specialist TITLE_FINANCIAL_SPECIALIST;
const sales_specialist TITLE_SALES_SPECIALIST;
const administrative_specialist TITLE_ADMINISTRATIVE_SPECIALIST;

/******************************************************************************************************************************************/
//test//
int main()
{
    double newsalary;
    int choose;
    cin >> newsalary>>choose;
    Employee* p=new Employee("32", "23", "23", "32", "323", "1", TITLE_MANAGER);
    p->information();
    title::change_Salary(newsalary, choose);
    p->information();
    Employee r("44", "442", "23", "32", "323", "1", TITLE_HUMAN_SPECIALIST);
    r = *p;
    r.information();
    delete p;
}