Overloaded functions

Question

So i have this 3 functions:

void bookings(const std::string name, const Date& date)const;
void bookings(const std::string name)const;
void bookings(const Date& date)const;

I want to use them in 3 different ways. First, if i pass the name and the date to use the first function. Second if i pass only the name to use the second function and if i pass only the date to use the third function. I am using the console to pass the arguments. Is there any way to do that? I write this :

std::string event, name;
        int d, m, y;
        std::cout << "event: ";
        std::getline(std::cin, event);
        std::cout << "date: ";
        std::cin >> d >> m >> y;
        if (event == "")
        {
            bookings(Date(d, m, y));
        }
        else if (d > 0 && m>0 && y>0) 
        {
            bookings(event, Date(d, m, y));
        }
        else
        {
            bookings(event);
        }

but in the case when i don't pass the date doesn't work. I know it is something with the arguments of the date and that in this case they aren't defined. Is there any way to fix this?

wouldn't it be easier to always call `bookings(event, Date(d, m, y));` and let the method check if event is empty or it is a valid date? — 463035818_is_not_an_ai, May 01 '20 at 12:22
please epxplain what is "doesn't work" do you get a compiler error? wrong output? — 463035818_is_not_an_ai, May 01 '20 at 12:22
also read https://stackoverflow.com/questions/5739937/using-getlinecin-s-after-cin, maybe that is the problem — 463035818_is_not_an_ai, May 01 '20 at 12:23
no there is not a comiler error. I just want when i don't pass any arguments for the date to call the last function, but when i skip passing the date arguments the program doesn't continue until i pass them. — Dontor, May 01 '20 at 12:27
what you mean with "skip passing the date arguments" ? The user has to provide the input. And make sure to read the question I linked above about the problem with getline after cin — 463035818_is_not_an_ai, May 01 '20 at 12:30
What, exactly, is going wrong? What does the code do, and what do you want it to do? As written, the first call to `bookings` will call `bookings(const Date&)`, the second call to `bookings` will call `bookings(const std::string, const Date&)`, and the third call to `bookings` will call `bookings(const std::string)`. You are not "using the console to pass the arguments". The code uses the console to get values for the arguments, and the code passes those values to `bookings`. — Pete Becker, May 01 '20 at 13:33

score 0 · Answer 1 · answered May 01 '20 at 12:42

You can get your date as strings using getline than check if they are set or not:

    std::string event, name;
    std::string sD, sM, sY;

    int d, m, y;
    d = m = y = 0;

    std::cout << "event: ";
    std::getline(std::cin, event);

    std::cout << "date: ";
    std::getline(std::cin, sD);
    std::getline(std::cin, sM);
    std::getline(std::cin, sY);

    if(!sD.empty() && !sM.empty() && !sY.empty())
    {
        d = atoi(sD.c_str());
        m = atoi(sM.c_str());
        y = atoi(sY.c_str());
    }

    if (event == "")
    {
        bookings(Date(d, m, y));
    }
    else if (d > 0 && m>0 && y>0) 
    {
        bookings(event, Date(d, m, y));
    }
    else
    {
        bookings(event);
    }

Overloaded functions

1 Answers1