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u/attractivechaos: I relate this to my own STC container library, which is a "true" templated library. When specifying a raw pointer as value type for the hashmap, and no value destructor, it behaves like a non-owning container. The user therefore manage the pointed-to data elements (or "nodes"), and can apply the "trick" you mention, so there is no memory size advantage for the intrusive map over a hashmap in this regard.
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