Error: Container duration eraser causes invalid iterator

Annotation: there is still a problem with the delete method 1. You should save the elements to be deleted and delete them one by one.
By debehe 2008.01.22

This mistake was made again. You can't help but remember :)

Each element of the container is a struct, and the elements in the struct are created on the stack. to delete an element, you must first release the memory allocated in the struct. Therefore:
When iterator is used to traverse a container in a for loop, while eraser (iterator) is traversed, it seems that there is no problem. In fact, there is a big error.

Cause of error:
Because after eraser (iterator) is executed, an iterator is returned, that is, the next element to be deleted, and the iterator used by the for loop has changed, however, I continue to ++ iterator. The ++ here is no longer as I imagined "subscript index plus 1 "!! An error occurs.

Correct methods to traverse and delete elements:
1. You can use reverse_iterator, rbegin, and rend to delete from the back to the front,
2. Do not use erasor, or clearall, or... remember that the iterator has changed. Nothing else is a problem.