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Some data structure texts I've seen use "bag" as a generalization of stack/queue/deque: can add items (repetitions allowed), can extract items (no order assumed, i.e. LIFO, FIFO; same sequence of insertions/extractions could give a different output sequence), ask if it is full. No "check if element is present", though. Perhaps what you are looking for is a ...


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Carrano, Data Abstraction & Problem Solving with C++: Walls and Mirrors begins by introducing a simple ADT kind of like you're talking about, called a "Bag". But it is not used as a base class for later examples (e.g., trees, et. al.). From Sec. 1.5:


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