What is saving iOS in the backend

Question

Consider that I select an object. Please see the image below.

In the above image, * myObject is a pointer. This refers to the space allocated to this object. When we save an object, I like to know what it does on the backend. I also like to know why we do this.

Also, when we release it, how it works on the backend.

I also like to know what happens in the backend when copying an object.

I am very sorry if my question is so simple.

Answer 1

What actually saves under the hood is this:

• Take global lock at objc runtime
• Look at a hash table entry based on a pointer to a stored object
• Counter increment in this entry
• Release the lock

I do not expect this to be all that is useful in practice, but I think this is what you asked for.