An indexed collection stores references to objects.
An indexed collection stores references to objects. It supports indexed access to objects (via the [] operator), addition of new objects (with automatics memory management), and removal of objects from the collection.New elements are appended to the end of the indexed collection. When an element is removed, the last element of the collection fills the vacant slot, thereby avoiding holes in the indexing.
Virtual functions do not make calls to other virtual functions
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