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  1. Prepare
  2. C++
  3. Debugging
  4. Messages Order
  5. Discussions

Messages Order

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93 Discussions

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  • pmchrist
     + 0 comments

    Message's id assignment should be handled by the factory.

    class Message {
public: 
    Message() {}
    Message(string text, int id):msg_body(text), msg_id(id) {}
    const string& get_text() {
        return msg_body;
    }
    bool operator<(const Message& other) const {
        return this->msg_id < other.msg_id;
    }
    
private:
    string msg_body;
    int msg_id;
};

class MessageFactory {
public:
    MessageFactory() {}
    Message create_message(const string& text) {
        msg_counter += 1;
        return Message(text, msg_counter);
    }
private:
    int msg_counter = -1;
};

  • sezzaldiin0
     + 0 comments
    class Message {
private:
    string text;
    static int id;
    int current_id;
public:
    Message() { current_id = ++id; }
    Message(string t){ current_id = ++id; text=t; }
    const string& get_text() {
        return text;
    }
    bool operator < (const Message& M2) {
        if(current_id < M2.current_id)
            return true;
        else
            return false;
    }
};
int Message::id = 0;
class MessageFactory {
public:
    MessageFactory() {}
    Message create_message(const string& text) {
        Message m = Message(text);
        return m;
    }
};

  • tunghan0916
     + 1 comment

    The key is the static variable.

  • joeydicastro
     + 0 comments
    class Message {
public: 
    Message() {}
    
    Message (const string& m) : m_Id(s_Id++), m_Message(m) {}
    
    const string& get_text() {
        return m_Message;
    }
    
    bool operator<(const Message& toCompare)
    {
        return m_Id < toCompare.m_Id;
    }
    
    static int s_Id;
    private:
    int m_Id;
    string m_Message;
    
};

int Message::s_Id = 0;

class MessageFactory {
public:
    MessageFactory() {}
    Message create_message(const string& text) {
        return Message(text);
    }
};``

  • warsgamerz730
     + 0 comments

    use c++ version 2014 otherwise not work

    #include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

class Message {
    string message;
    int order;
    static int tot_n;
public: 
    Message(){ 
        tot_n++;
        order = tot_n;
    }
    Message(const string& s){
        tot_n++;
        order = tot_n;
        message = s;
    }
    const string& get_text() {
        return message;
    }
    bool operator<(const Message& m){
        return (order < m.order);
    }
};

int Message::tot_n = 0;

class MessageFactory {
public:
    MessageFactory() {}
    Message create_message(const string& text) {
        Message m(text);
        return m;
    }
};

class Recipient {
public:
    Recipient() {}
    void receive(const Message& msg) {
        messages_.push_back(msg);
    }
    void print_messages() {
        fix_order();
        for (auto& msg : messages_) {
            cout << msg.get_text() << endl;
        }
        messages_.clear();
    }
private:
    void fix_order() {
        sort(messages_.begin(), messages_.end());
    }
    vector<Message> messages_;
};

class Network {
public:
    static void send_messages(vector<Message> messages, Recipient& recipient) {
    // simulates the unpredictable network, where sent messages might arrive in unspecified order
        random_shuffle(messages.begin(), messages.end());         
        for (auto msg : messages) {
            recipient.receive(msg);
        }
    }
};



int main() {
    MessageFactory message_factory;
    Recipient recipient;
    vector<Message> messages;
    string text;
    while (getline(cin, text)) {
        messages.push_back(message_factory.create_message(text));
    }
    Network::send_messages(messages, recipient);
    recipient.print_messages();
}