When do you need to delete an object?

Question

Callback* p = new Callback;
function(p);

If I want to delete a callback object, when and how to delete it?

If it is deleted earlier, then the callback may fail with a segmentation error.

Answer 1

The best solution for this is to use a smart pointer.
You initialize the pointer with a callback and pass it to the function. when a function or any process is executed, the callback will be automatically deleted using the smart pointer.
Efficient smart pointer implementationboost::shared_ptr<>

Answer 2

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func(p.get());

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Answer 6

If your code is as simple as you wrote, and func()directly calls a callback at some point, this should be enough:

Callback p;
func(&p);

However, if you func()save the link or callback pointer elsewhere, you need to track the lifetime of that link.