The C++ Workshop by Dale Green
 Kurt Guntheroth
 and Shaun Ross Mitchell

Author:Dale Green
, Kurt Guntheroth
, and Shaun Ross Mitchell
Language: eng
Format: epub, mobi
Publisher: Packt Publishing Pvt. Ltd.
Published: 2020-12-24T00:00:00+00:00

The next step is to begin entering the body of main(). First, declare an instance of numeric_list called l. This function-local variable will be destroyed when main() returns: numeric_list l;

Create a for loop to add five items to the list, and then print out the list: for (int i = 1; i < 6; ++i)

{

l.add(i);

}

l.print();

Declare a numeric_item pointer called p, and assign to p the value returned by l.find(4). The value in p is an unowned pointer. We already know find() will discover an item with this value because we added it moments ago. Output a message if the returned pointer is not nullptr, just to be sure: numeric_item* p = l.find(4);

if (p != nullptr)

cout << "found numeric_item 4" << endl;

That's it. When main() returns, p is still pointing to an item in l. p isn't deleted, but that's fine because p is an unowned pointer.

As main() returns, l's destructor is called. Since l has an owned pointer, l's destructor must delete anything it points to, which is the entire list.

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