C++自学：运算符重载 - 包括“==” ，“+=”，“-=” 和 “＜＜”

以下代码重载了运算符+= 和 -=，使代码能够在自定义的YouTubeChannel list中增减对象。

#include 
#include 
#include 

using namespace std;

struct YouTubeChannel{
    string Name;
    int SubscribersCount;

    YouTubeChannel(string name, int subscribersCount){
        Name = name;
        SubscribersCount = subscribersCount;
    }

    bool operator==(const YouTubeChannel & channel){
        return this->Name == channel.Name;
    }
};

struct MyCollection{
    list<YouTubeChannel> myChannels;

    void operator+=(YouTubeChannel & channel){
        this->myChannels.push_back(channel);
    }
    void operator-=(YouTubeChannel & channel){
        this->myChannels.remove(channel);
    }
};

ostream& operator<<(ostream& COUT, YouTubeChannel& ytChannel){
        COUT << "Name: " << ytChannel.Name << endl;
        COUT << "SubscribersCount: " << ytChannel.SubscribersCount << endl;
        return COUT;
}

ostream& operator<<(ostream& COUT, MyCollection& myCollection){
    for(YouTubeChannel ytChannel: myCollection.myChannels){
        COUT << ytChannel << endl;
    }
    return COUT;
}

int main(){

    YouTubeChannel yt1 = YouTubeChannel("dell", 5000);
    YouTubeChannel yt2 = YouTubeChannel("asus", 7000);

    MyCollection myCollection;
    myCollection += yt1;
    myCollection += yt2;
    myCollection -= yt2;

    cout << myCollection;

    return 0;
}