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If, however, the hasNext() method returns false, there are no more elements, and the monitor enters the none state. In the more and none states, calling the hasNext() method provides no new information. It is safe to call the next() method from the more state, but it becomes unknown if more elements exist, so the monitor reenters the initial ...
The next() method advances the iterator and returns the value pointed to by the iterator. The first element is obtained upon the first call to next(). [18]: 294–295 To determine when all the elements in the container have been visited the hasNext() test method is used. [18]: 262 The following example shows a simple use of iterators:
It implicitly calls the IntoIterator::into_iter method on the expression, and uses the resulting value, which must implement the Iterator trait. If the expression is itself an iterator, it is used directly by the for loop through an implementation of IntoIterator for all Iterator s that returns the iterator unchanged.
MustInherit vs abstract - prevents a class from being directly instantiated, and forces consumers to create object references to only derived classes; MustOverride vs abstract - for forcing derived classes to override this method; MyBase vs base - for referring to the base class from which the current class is derived
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A good example that highlights the pros and cons of using dynamic arrays vs. linked lists is by implementing a program that resolves the Josephus problem. The Josephus problem is an election method that works by having a group of people stand in a circle. Starting at a predetermined person, one may count around the circle n times.
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The observer design pattern is a behavioural pattern listed among the 23 well-known "Gang of Four" design patterns that address recurring design challenges in order to design flexible and reusable object-oriented software, yielding objects that are easier to implement, change, test and reuse.