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lang-cpp
Queue(){ Queue(SOME_PREDEFINED_CONSTANT);is not doing what you think it is doing.Queue() : Queue(SOME_PREDEFINED_CONSTANT) {}As written, your default constructor does not initialize any members. In its body, it creates and immediately discards a temporaryQueue, which has zero effect.Queue(int size = SOME_PREDEFINED_CONSTANT)achieves the same as "two in one". IfQueueis constructed without argument,SOME_PREDEFINED_CONSTANTis used as default.