help linked list of objects

Greetings from a newbie,
I'm currently working on a project similar to facebook but way simpler using a command line interface. The user is able to create an account and he/she is entitled to add interests and create friendships with other users.
The main algorithm that I developed is based upon an object which is the user and its attributes are the functions that add interests, friends, so on.
Users are stored in a linked list while their interests are stored in another list.
What I want to do is every time a new user is created, add that user to the list and create a new list containing the user's personal info. In other words, create a list of objects.
This is a sample of the algorithm I've thought of:

Code:

---

#include <iostream>
#include <cstdio>
#include <string>
#include "List.h"

using namespace std;
template<class User> class List;
class User
{
    private:
    string name;
    List<string> listInterest;
    public:
    User() {}
    List<string> listUser;
    void setName(string name);
    ~User() {}
};

void User::setName(string name)
{
    listUser.add(User(name));
}

int main()
{
    User U;
    U.setName("Jane");
    return 0;
}

---

As you can see I get a compilation error that I don't understand: "no matching function for call to 'User::User()'

Is someone willing to give me a hint? Just so I get on the right track.
I would highly appreciate it. Thank you!

Code:

---

listUser.add(User(name));

---

What is this? listUser is a List<string>, but you're trying to add a User. And User has no constructor that takes a string.

Explain what you're trying to do with all this.

I just read this again, and I think I see what you're going for now. Take a look at this code:

Code:

---

class User
{
        private:
        string name;
        List<string> interests;
       
        public:
        User(){}
        ~User(){}
        void setName(string name);
        void addInterest(string interest);
};

void User::setName(string name)
{
        this->name=name;
}

void User::addInterest(string interest)
{
        interests.Add(interest);
}

int main()
{
        User u;
        u.setName("blaschi");
        u.addInterest("C++");
       
        List<User> users;
        users.add(u);
       
        return 0;
}

---

Now, notice that each user has two things: a name and a lit of interests, and we have a list of users that is external to the user class.

Ok, let me start over.
I've managed to create a list of objects, as follows:

Code:

---

#include <iostream>
#include <cstdio>
#include <string>
#include "List.h"

using namespace std;
template<class User> class List;

class User
{
    private:
    // a list inside the user object, containing all of its interests
    List<string> listInterest;
    string name;
    public:
    User() {}
    ~User() {}
};

int main()
{
    List<User> listUser;
    listUser.add(User());
    return 0;
}

---

That works fine, and what I'm doing there is adding an object user to the main user list.
Now this is what I'm trying to get right:
I want to be able to identify the user object within the user list by its name, that way I know whether the user exists or not.
So my question is: is it possible to add an object to the list identified by its name?
like

Code:

---

listUser.add(User(name));

---

I know that it won't work, I have to assign its name in the constructor, but as an example so I'm clear on what I'm trying to create.
Thank you.

Quote:

---

Originally Posted by blaschi

is it possible to add an object to the list identified by its name?

---

Not yet. But you could provide an appropriate constructor, e.g.,

Code:

---

explicit User(const std::string& name_) : name(name_) {}

---

By the way, you can ditch the User destructor as the compiler generated version should suffice.

Thanks, I'll look into that.