请用C++写一段实现景区预约管理系统的代码

以下是用C++实现景区预约管理系统的简单代码示例：

#include <iostream>
#include <string>
#include <vector>

using namespace std;

// 定义预约信息结构体
struct Reservation {
    string name;  // 预约人姓名
    int age;  // 预约人年龄
    string id;  // 预约人身份证号
    int num;  // 预约人数量
    string date;  // 预约日期
};

// 定义景区类
class ScenicSpot {
private:
    int limit;  // 每日游客人数上限
    vector<Reservation> reservations;  // 预约信息列表

public:
    ScenicSpot(int limit) {
        this->limit = limit;
    }

    // 添加预约信息
    bool addReservation(Reservation reservation) {
        // 检查预约日期是否已满
        int count = 0;
        for (Reservation r : reservations) {
            if (r.date == reservation.date) {
                count += r.num;
            }
        }
        if (count + reservation.num > limit) {
            cout << "预约失败：该日期的预约人数已满！" << endl;
            return false;
        }

        // 添加预约信息
        reservations.push_back(reservation);
        cout << "预约成功！" << endl;
        return true;
    }

    // 取消预约
    bool cancelReservation(string name, string id, string date) {
        for (int i = 0; i < reservations.size(); i++) {
            if (reservations[i].name == name &&
                reservations[i].id == id &&
                reservations[i].date == date) {
                reservations.erase(reservations.begin() + i);
                cout << "取消预约成功！" << endl;
                return true;
            }
        }
        cout << "取消预约失败：未找到该预约信息！" << endl;
        return false;
    }

    // 查询预约信息
    void queryReservation(string name, string id) {
        for (Reservation r : reservations) {
            if (r.name == name && r.id == id) {
                cout << "姓名：" << r.name << endl;
                cout << "年龄：" << r.age << endl;
                cout << "身份证号：" << r.id << endl;
                cout << "预约人数：" << r.num << endl;
                cout << "预约日期：" << r.date << endl;
                return;
            }
        }
        cout << "未找到该预约信息！" << endl;
    }

    // 获取剩余可预约名额
    int getRemainingCapacity(string date) {
        int count = 0;
        for (Reservation r : reservations) {
            if (r.date == date) {
                count += r.num;
            }
        }
        return limit - count;
    }
};

int main() {
    ScenicSpot scenicSpot(100);  // 创建一个每日游客人数上限为100的景区

    // 添加预约信息
    Reservation reservation1 = {"张三", 25, "310101199001010001", 3, "2022-05-01"};
    scenicSpot.addReservation(reservation1);
    Reservation reservation2 = {"李四", 30, "310101199201020002", 2, "2022-05-01"};
    scenicSpot.addReservation(reservation2);

    // 取消预约
    scenicSpot.cancelReservation("张三", "310101199001010001", "2022-05-01");

    // 查询预约信息
    scenicSpot.queryReservation("李四", "310101199201020002");

    // 获取剩余可预约名额
    int remainingCapacity = scenicSpot.getRemainingCapacity("2022-05-01");
    cout << "2022-05-01 剩余可预约名额：" << remainingCapacity << endl;

    return 0;
}

以上代码只是一个简单的示例，实际的景区预约管理系统还需要更完善的功能和更复杂的实现。