CODEWITHSUNDEEP
c++classobjectdynamicvector
jshapy8
jshapy8

Reputation: 2051

How to add new objects to vector in C++

I am trying to create a program which allows a user to add an object of class called Vehicle to an inventory that is stored in a vector. The vector has an initial size of zero. Each object is a vehicle that the user enters the attributes of.

What I cannot wrap my head around is how to let the user keep adding vehicles if each vehicle needs to be its own separate object. How do you let C++ determine what the name of new objects should be if the user decides to keep adding more vehicles (objects) to the inventory (vector called carList).

Could someone guide me in the right direction? I apologize if this is obvious, I am new to the language. Must I do something that involves dynamically allocating objects or something similar?

Here is my (incomplete) code:

void addVehicle(vector<Vehicle> carList)
{
    char   stop;            // Needed for stopping the do-while loop 
    string VIN = "",        // Needed to hold user input for the VIN
           Make = "",       // Needed to hold user input for the Make
           Model = "";      // Needed to hold user input for the Model
    int    Year = 0;        // Needed to hold user input for the Year
    double Price = 0.0;     // Needed to hold user input for the Price

    cout << "You have chosen to add a vehicle to your inventory.\n\n";

    do
    {
        cout << "There are currently " << carList.size() << " vehicles in your inventory.\n\n"
             << "\t\t\tVehicle #" << (carList.size() + 1) << ": \n"
             << "\t\t___________________________\n\n";

        Vehicle /*new object needs to go here*/
        carList.push_back(/*new object from the line above*/);

        // Prompt user to input VIN
        cout << "VIN: ";
        cin >> VIN;

        // Prompt user to input Make
        cout << "Make: ";
        cin.ignore(); 
        getline(cin, Make);

        // Prompt user to input Model
        cout << "Model: ";
        getline(cin, Model);

        // Prompt user to input Year
        cout << "Year: ";
        cin >> Year;

        // Prompt user to input Price
        cout << "Price: $";
        cin >> Price;

        Call to the overloaded constructor to store user input in object
        /*(newly created object)*/.Vehicle::Vehicle(VIN, Make, Model, Year, Price);

        // Ask user if they would like to enter another vehicle
        cout << "\nWould you like to enter another vehicle? (Y/N):";
        cin.ignore();
        stop = cin.get();

    } while (stop != 'N');

}

Any help would be appreciated. Thanks!

Upvotes: 1

Views: 6122

Answers (1)

fredoverflow
fredoverflow

Reputation: 263078

How about you first create the object and then push a copy into the vector?

Call to the overloaded constructor to store user input in object
Vehicle temp(VIN, Make, Model, Year, Price);
carList.push_back(temp);

But there's no need for the variable, really:

Call to the overloaded constructor to store user input in object
carList.push_back(Vehicle(VIN, Make, Model, Year, Price));

And if you have C++11, you can even construct the object directly in place:

Call to the overloaded constructor to store user input in object
carList.emplace_back(VIN, Make, Model, Year, Price);

Look ma, no copies!

Upvotes: 5

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