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The restriction on DVRs is the same for interfaces as for classes: it allows for constructor/destructor notation for by-reference entities. Please don't go hyper excited and think "Oh, this is the tool I should have been using all along." By-reference designs are fragile and prone to several classes of errors that by-value code cannot create. Stick to the wires where possible; use references only when nothing else serves! 🙂 Details here.1 point