set_multiset_functor

#include<iostream>
#include<string>
#include<set>
using namespace std;

class Student
{
public:
    Student(int age,string name)
    {
        m_age=age;
        m_name=name;
    }

    Student(const Student &stu)
    {
        m_age=stu.m_age;
        m_name=stu.m_name;
        cout << "Student "<<m_name<<","<<m_age<<endl;
    }

    int m_age;
    string m_name;
};

class stuFunctor{
public:
    bool operator()(const Student &stu1,const Student &stu2)
    {
        return stu1.m_age>stu2.m_age;
    }
};

void TestStudent()
{
    
    set<Student,stuFunctor> setStudent;
    //Student A(1,"aa"),B(2,"bb"),C(3,"cc");
    //setStudent.insert(A);
    //setStudent.insert(B);
    //setStudent.insert(C);
    setStudent.insert(Student(1,"aa"));
    setStudent.insert(Student(2,"bb"));
    setStudent.insert(Student(3,"cc"));
    
    set<Student,stuFunctor>::iterator it;
    for (it=setStudent.begin();it!=setStudent.end();++it)
    {
        cout<<it->m_name<<" ";
    }
    cout<<endl;
/*
Student aa,1
Student bb,2
Student cc,3
cc bb aa
请按任意键继续. . .
*/
}


void TestFunctor()
{
    int a[6]={1,2,3,4,5,6};
    //set<int,less<int>> setInt;
    set<int,greater<int>> setInt;
    for (int i=0;i<6;i++)
    {
        setInt.insert(a[i]);
        setInt.insert(a[i]);
    }
    //set<int,less<int>>::iterator it;
    set<int,greater<int>>::iterator it;
    for (it=setInt.begin();it!=setInt.end();++it)
    {
        cout<<*it<<" ";
    }
    cout<<endl;
}

void TestMultiSet()
{
    int a[6]={1,2,3,4,5,6};
    multiset<int> setInt;
    for (int i=0;i<6;i++)
    {
        setInt.insert(a[i]);
        setInt.insert(a[i]);
    }
    multiset<int>::iterator it;
    for (it=setInt.begin();it!=setInt.end();++it)
    {
        cout<<*it<<" ";
    }
    cout<<endl;
/*
1 1 2 2 3 3 4 4 5 5 6 6
请按任意键继续. . .
*/
}

void main()
{
    TestStudent();return;
    TestFunctor();return;
    TestMultiSet();return;
    int a[6]={1,2,3,4,5,6};
    set<int> setInt;
    for (int i=0;i<6;i++)
    {
        setInt.insert(a[i]);
        setInt.insert(a[i]);
    }
    set<int>::iterator it;
    for (it=setInt.begin();it!=setInt.end();++it)
    {
        cout<<*it<<" ";
    }
    cout<<endl;

/*
1 2 3 4 5 6
请按任意键继续. . .
*/
  
}