c++ merge学习问题

Question

请问如何利用运算符重载完成merge

#include<iostream>
using namespace std;

#include<vector>
#include<algorithm>
#include<string>
#include<ctime>
#include<functional>



class Person
{
public:
    Person()
    {
        
    }
    
    Person(string name, int age);
    ~Person();

    bool operator<(const Person& p)
    {
        if (this->m_Age < p.m_Age)
        {
            return 1;
        }
        else
            return 0;
    }

private:
    string m_Name;
    int m_Age;

    friend void test02();
    friend class MyPrint;
    friend class MyCompareUP;
    friend class MyCompareDown;
};

Person::Person(string name, int age)
{
    this->m_Name = name;
    this->m_Age = age;
}

Person::~Person()
{

}

class MyCompareUP
{
public:
    bool operator()(const Person& p1, const Person& p2)
    {
        return p1.m_Age < p2.m_Age;
    }
};

class MyCompareDown
{
public:
    bool operator()(const Person& p1, const Person& p2)
    {
        return p1.m_Age > p2.m_Age;
    }
};

class MyPrint
{
public:
    void operator()(const Person& p)
    {
        cout << "姓名" << p.m_Name << "年龄" << p.m_Age << endl;
    }
};

void myPrint(int c)
{
    cout << c << " ";
}

void test01()
{
    vector<int>v,v2,v3;
    for (int i = 0; i < 10; i++)
    {
        v.push_back(i);
        v2.push_back(i+1);
    }

    

    cout << "升序合并" << endl;
//    sort(v.begin(), v.end());
//    sort(v2.begin(), v2.end());
    v3.resize(v.size() + v2.size());
    merge(v.begin(), v.end(), v2.begin(), v2.end(), v3.begin());
    for_each(v3.begin(), v3.end(), myPrint); cout << endl;
    v3.clear();

    cout << "降序合并" << endl;
    sort(v.begin(), v.end(),greater<int>());
    sort(v2.begin(), v2.end(),greater<int>());
    v3.resize(v.size() + v2.size());
    merge(v.begin(), v.end(), v2.begin(), v2.end(), v3.begin(),greater<int>());
    for_each(v3.begin(), v3.end(), myPrint); cout << endl;
    v3.clear();
}

void test02()
{
    vector<Person>v,v2,v3;
    char nameSeed[3][2] = { "A","B","C" };
    srand((unsigned int)time(NULL));

    for (int i = 0; i < 3; i++)
    {
        int age = rand() % 100 + 1;
        v.push_back(Person((const char*)nameSeed[i], age));
    }

    
    Person pp("C", 0);
    v2.push_back(pp);
    


    cout << "升序合并" << endl;
    sort(v.begin(), v.end(),MyCompareUP());
    sort(v2.begin(), v2.end(),MyCompareUP());
    v3.resize(v.size() + v2.size());
    merge(v.begin(), v.end(), v2.begin(), v2.end(), v3.begin(),[](const Person& p1,const Person& p2){return p1<p2;});
    for_each(v3.begin(), v3.end(), MyPrint()); cout << endl;
    v3.clear();

    cout << "降序合并" << endl;
    sort(v.begin(), v.end(),MyCompareDown());
    sort(v2.begin(), v2.end(),MyCompareDown());
    v3.resize(v.size() + v2.size());
    merge(v.begin(), v.end(), v2.begin(), v2.end(), v3.begin(), [](const Person& p1,const Person& p2){return p1>p2;});
    for_each(v3.begin(), v3.end(), MyPrint()); cout << endl;
    v3.clear();

}



int main()
{
        test01();cout<<endl<<endl;
        test02();cout<<endl<<endl;


}

Answer 1

Person 类 你还少一个 > 的重载，另外 < 的重载也可以简写一下

    bool operator<(const Person& p) const
    {
        return this->m_Age < p.m_Age;
    }

    bool operator>(const Person& p) const
    {
        return this->m_Age > p.m_Age;
    }