Abstract
There are many data structures which store an object and provide a handle which may subsequently be used to identify the object stored. Ada makes it difficult to treat these data structures, which we call collections, in a general way. More specifically, without providing some knowledge of the internal structure of the collection, it is hard to provide the user of the collection with facilities for updating an element of the collection in place. This paper discusses some of the difficulties and then, through a sequence of solved problems, shows how such facilities can be constructed.

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