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is it ok to call delete to something thats already deleted?
I have some objects in several different lists at the same time, and if i delete all the data from all the lists, then there will be some deletes that are trying to delete something thats already been deleted.
Will this cause problems?
No, you should really avoid that. It's for that reason that you should always set the pointer to NULL after you deallocate its memory. delete won't do anything if trying to delete a NULL pointer.
As Magos said; when you delete something just set it to NULL, and recurring calls to delete won't do a thing.
Thats good practice, but take this situation.
There are two objects, each has a single member that points to a third object. If i delete the third object by using its refrence from the second, and then try to delete it again using the refrence from the first object, will there be problems.
Setting one pointer to NULL after deleteing its data has no effect on the other pointer.