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--- ] [ FAQ: Container swap and iterator invalidation or not?
The second re-uses erased element memory locations, but in a way which promotes element contiguousness (positioning the inserted element as close to the insertion position as possible in memory).
Like std::list, plf::list maintains stable pointer/iterator links to list elements regardless of erasure, insertion, merging, splicing, reversing and sorting.
It's functionality replicates std::list with two minor exceptions: the removal of incomplete list splices (splicing whole lists is still available) and inclusion of several useful functions: reserve(), shrink_to_fit(), free_unused_memory(), and approximate_memory_use().
This effectively reduces the container size by the number of elements removed, which are destroyed.
Unlike other standard sequence containers, list and forward_list objects are specifically designed to be efficient inserting and removing elements in any position, even in the middle of the sequence.