设计模式 C++迭代器模式

// sejimoshi.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//

#include <iostream>
#include <list>
#include<algorithm>
using namespace std;

class Student
{
private:
    string name;
    long id;
    int age;
public:
    string getName() {
        return name;
    }
    long getId() {
        return id;
    }
    int getAge() {
        return age;
    }
    void setName(string name) {
        this->name = name;
    }
    void setAge(int age) {
        this->age = age;
    }
    void setId(long id) {
        this->id = id;
    }
    Student(string name, long id, int age) {
        this->name = name;
        this->id = id;
        this->age = age;
    }
};


//比较函数:根据结构体里面的整型number排序
bool sortStuInt(Student m1, Student m2)
{
    return m1.getId() < m2.getId();
}
//比较函数:根据结构体里面的字符串name排序
bool comStuString(Student m1, Student m2)
{
    if (m1.getId() > m2.getId())
    {
        return true;
    }
    else
    {
        return false;
    }
}

int main()
{
    std::cout << "Hello World!\n";
    list<Student> list_student;
    list_student.push_back(Student("lisi", 20194001, 20));
    list_student.push_back(Student("wangwu", 20194002, 21));
    list_student.push_back(Student("zhaosi", 20194003, 22));
    list_student.push_back(Student("xiaoming", 20194005, 20));
    list_student.push_back(Student("xiaohong", 20194004, 22));
    list_student.push_back(Student("xiaohuang", 20194010, 20));
    list_student.push_back(Student("xiaolan", 20194008, 20));
    cout << "迭代器正序遍历\n";
    list_student.sort(sortStuInt);
    //使用begin()/end()迭代器函数对输出list容器中的元素
    for (std::list<Student>::iterator it = list_student.begin(); it != list_student.end(); ++it) {
        std::cout << (*it).getId()<<endl;
    }
    cout << "迭代器倒序遍历\n";
    list_student.sort(comStuString);
    //使用begin()/end()迭代器函数对输出list容器中的元素
    for (std::list<Student>::iterator it = list_student.begin(); it != list_student.end(); ++it) {
        std::cout << (*it).getId() << endl;
    }
}

bool cmp_1(Student x, Student y) {
    return x.getId() > y.getId();
}
bool cmp_2(Student x, Student y) {
    return x.getId() < y.getId();
}