Singly linked-list class with constructors?

Well, logically, a node is a separate structure (class), but in common implementations, the list itself is represented by the first node.

If by "separate class" you mean not nested within list, then no, it's better for it to be nested (and private). But that doesn't mean you can't give it constructors, destructors, operators, methods, etc. (i.e. Turn it into a full-blown class).

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