Task 0
Create own class. Write a destructor shows a text in the console.
In main method create a new object of the class (use "new" keyword").
Do you see destructor's output?
Task 1
Change main method, program will start deallocating memory without "delete" keyword.
unique_ptr<A> smart_a(new A(20)); // We use new, but we're wrapping poitner in unique_ptr
cout << smart_a->i << endl; // we can use smart_a like a poitner
Types of smart poitners
- unique_ptr - deleting poitner deletes an object
- shared_ptr - we share having an object; last deleted shared_ptr deletes reffered object
- weak_ptr - works like shared_ptr, but it doesn't extend object's lifespan
Task 2
Create a structure of linked list. Create a list with 4 elements. Use smart poitners to manage memory.
Task 3
Implement class diagram:
Class diagram
Additional rules
- World is not sharing a country.
- Country can exist without any company.
- If we delete a country, we should delete its companies as well.
- Deleting a world deletes all counties and companies.