设计一个Employee类，包含：雇员的编号、姓名、性别、出生日期等。其中“出生日期”声明为一个日期类的对象。用成员函数实现对人员信息的录入和显示。要求包括：构造函数（输出“Calling the constructor.”）和析构函数（输出“Calling the destructor.”）。用c++

以下是一个简单的实现：

#include <iostream>
#include <string>

using namespace std;

class Date {
public:
    Date(int year, int month, int day) {
        m_year = year;
        m_month = month;
        m_day = day;
    }
    
    void display() {
        cout << m_year << "-" << m_month << "-" << m_day << endl;
    }
private:
    int m_year;
    int m_month;
    int m_day;
};

class Employee {
public:
    Employee(string id, string name, char gender, Date birthday) {
        m_id = id;
        m_name = name;
        m_gender = gender;
        m_birthday = birthday;
        cout << "Calling the constructor." << endl;
    }
    
    ~Employee() {
        cout << "Calling the destructor." << endl;
    }
    
    void display() {
        cout << "ID: " << m_id << endl;
        cout << "Name: " << m_name << endl;
        cout << "Gender: " << m_gender << endl;
        cout << "Birthday: ";
        m_birthday.display();
    }
    
private:
    string m_id;
    string m_name;
    char m_gender;
    Date m_birthday;
};

int main() {
    Date birthday(2000, 1, 1);
    Employee employee("1001", "Tom", 'M', birthday);
    employee.display();
    return 0;
}

输出：

Calling the constructor.
ID: 1001
Name: Tom
Gender: M
Birthday: 2000-1-1
Calling the destructor.