Error no appropriate default constructor available

Question

I am implementing a list class with node and iterator, that creates a list of type Ticket, which is an object that i have defined in a class, but when i try to compile it says t

Answer 1

When you don't include code to initialize a base class in the initialization list of a constructor of a derived class, the base class is initialized using the default constructor. In other words,

List::List()
{
}

is equivalent to:

List::List() : Ticket()
{
}

Since Ticket does not have a default constructor, the compiler does not have any way to initialize Ticket from the posted code.

You can resolve this problem by one of the following methods:

1. Add a default constructor to Ticket

2. Update List::List() to use the only constructor of Ticket in the initialization list.

   List::List() : Ticket(0, 0, 0) // You need to figure out what values
                                  // make sense in your application.
   {
   }
   

Answer 2

Ticket doesn't have a default constructor, therefore List can't be default-constructed since it inherits from Ticket, and List does not call a base constructor in Ticket.