array with different elements c++

Question

I need to put in an array some data from show.

I have this function:

addShow(string name, string theatre, string day, string hour, int totalTickets, float price)

I have a dinamic array which maximum length is the maximum shows that can be done.

arrayShows = new int[totalShows];

Now, I need to put in this array the data of each show, how can I do it?

I thought something like this:

count = 0;
arrayShows[count]= name;
arrayShows[count+1]= theatre;
arrayShows[count+2]= day;
arrayShows[count+3]= hour;
arrayShows[count+4]= totalTickets;
arrayShows[count+5]= price;

count += 6;

But as you can see if the maximum shows is 5, this is not correct because I can only put some data from the first show, but the other 4 shows won't be stored.

Could I do a bidimensional dinamic array to do solve this problem?

Change string name to const string& name to avoid copying the strings — Ed Heal
– Ed Heal, Commented Nov 18, 2017 at 16:59
Don't use a floating-point number for the price. Store the cents as an int. — Christian Hackl
– Christian Hackl, Commented Nov 18, 2017 at 17:19

Edgar Rokjān · Accepted Answer · 2017-11-18 17:15:22Z

What you need is to create either structure or class which represents a show. It is not that difficult:

struct Show {
    Show() = default;

    Show(const std::string& name, const std::string& theater,
        const std::string& day, const std::string& hour,
        int totalTickets, float price)
        : name(name)
        , theater(theater)
        , day(day)
        , hour(hour)
        , totalTickets(totalTickets)
        , price(price)
    {}

    std::string name;
    std::string theater;
    std::string day;
    std::string hour;
    int totalTickets;
    float price;
};

Then, avoid using dynamic arrays and use std::vector instead:

std::vector<Show> shows(totalShows);
shows[0] = Show(name, theater, day, hour, totalTickets, price);

Or just add new elements on the fly:

shows.emplace_back(name, theater, day, hour, totalTickets, price);

There are, of course, other approaches like using std::tuple, but you do not need to make things more complicated then they are.

Mateusz Drost · Accepted Answer · 2017-11-18 17:11:28Z

0

If you want to store different types in array you can use C++17 std::any or std::variant. std::any:

std::vector<std::any> arrayShows;
arrayShows.push_back(name);
arrayShows.push_back(theatre);
arrayShows.push_back(day);
arrayShows.push_back(hour);
arrayShows.push_back(totalTickets);
arrayShows.push_back(price);

std::variant:

std::vector<std::variant<int, float, std::string>> arrayShows;
arrayShows.push_back(name);
arrayShows.push_back(theatre);
arrayShows.push_back(day);
arrayShows.push_back(hour);
arrayShows.push_back(totalTickets);
arrayShows.push_back(price);

Or if you cannot use C++17 you could implement your own solution using type erasure.

answered Nov 18, 2017 at 17:11

Mateusz Drost

1,20111 silver badges26 bronze badges

Comments

Pritesh Jadhav · Accepted Answer · 2017-11-18 17:13:04Z

0

Create class for your data and then make array of the objects of class that will do

answered Nov 18, 2017 at 17:13

Pritesh Jadhav

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