Adding unsafe iterators to the vector class in Java

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Adding unsafe iterators to the vector class
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over That way it can ensure that it is at a valid position Also when two iterators are subtracted, the first iterator can verify that the second iterator refers to the same vector The two iterator classes must then provide overloaded operators, such as two versions of operator--,up to two vertwo versions of operator++, operator==, operator!= operator+,and various sions of operator*, operator-, of which can have extensive error checking all There is one additional major detail: Because an iterator can be used anywhere a const-iterator can be used (but not vice versa), it follows that there is an IS-A relationship As a result ConstvectorIterator is a base class and vec tor1terator is a derived class Needless to say, that introduces quite a few additional details You will have to wait until 17 to see how it all gets resolved (in the context of another container)
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Sequences and Linked Lists
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In Section 163 we presented a basic linked list In a linked list we store items noncontiguously rather than in the usual contiguous array The advantage of doing so is twofold First, an insertion into the middle of the list does not require moving all the items that follow the insertion point Data movement is very expensive in practice, and the linked list allows insertion with only a constant amount of assignment statements Second, if the array size is not known in advance we must use the array-doubling technique In the course of expanding the array from size S to 2S, we need 3S units of available memory After the expansion has been completed, we still need 2S units of memory, meaning that we have to waste lots of memory If the data items are large, we would rather have only the overhead of a pointer per item The basic linked list is shown in Figure 71 1 Note that, if we allow access only at first,we have a stack and that, if we allow insertions on1 y at last and access only at first, we have a queue Typically we need more general operations, such as finding o r removing any named item in the list We also need to be able to insert a new item at any point These requirements are far more than either a stack or a queue allows To access items in the linked list, we need a pointer to the corresponding node Clearly, however, granting this access is a violation of information hiding principles We need to ensure that any access to the list through a pointer is safe, which is where the iterator comes in
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The linked list is used large amounts of data movement^ It uses a small amount of space per item
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Access to the list is achieved by an iterator class The list class has operations that reflect the state of the list All other operations are in the iterator class
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The STL provides three sequence implementations, but only two are generally used: an array-based version and a linked-list based version The array-based version may be appropriate if insertions are performed only at the high end of the array (using push-back), for the reasons discussed in Section 124 The
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The basic trade-off between vector and list is that random access iterators are available only for vector,whereas insertion and removal from the middle of a container is efficiently supported only for list
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STL doubles the array if an insertion at the high-end would exceed an internal capacity Although this procedure gives good Big-Oh performance, for large objects that are expensive to construct, a list version would be preferable in order to minimize calls to the constructors The list class implements a linked list Insertions and deletions toward the middle of the sequence are inefficient in vectorA vector allows direct access by the index, but a list does not Thus the 1ist class can always be safely used unless indexing is needed The vector class may still be a better choice if insertions occur only at the end and the objects being inserted are not overly expensive to construct Additional operations on sequences include the following
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