[Newbies] Linked list structure?

[Marcin Tustin]

Is there - either as standard, or freely downloadable - a datastructure that
is ordered, has constant-time appends of items, requires no particular
protocol of the items stored, and can be iterated over (without allocating a
new structure) starting with the first item added, proceeding to the next
item added? I.e. has the characteristics of a linked list structure in most
other datastructure libraries?
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