iterator

Iterator is so common that it has ceased to be a formal pattern at all; it is just a feature of the language.

the index of the element that would be returned by a subsequent call to previous, or -1 if list iterator is at beginning of list.

the computation of an iterator to an element from a pointer or reference to that element should be a constant time operation.

While I was at it, I wrote the whole thing as a lazy iterator so you don't need to instantiate a large node-list if you don't need one.

Execution is restarted from this location the next time the iterator is called.

The Parallelism iterator at the boundary of two such regions is called Segment Repartition.

Then, at the bottom of the file, I use a foreach iterator to walk through the list of traces in the data.

In the closure you call your first query and map the results of that query in an iterator to your child node, which is word.

You're able to use a familiar iterator-like syntax to search through the document to find the data you want.

In general, the generic algorithms operate on iterator pairs that denote a range of elements in a container (or other sequence).

G - This pane is part of a spatial iterator used to show the icon portion of the icon navigation link.

Ordinarily , when we assign to a container element through an iterator, we assign to the element to which the iterator refers.

Although the charAt implementation directly returns char primitives, the iterator implementation must box each char into a Character object.

I then use short-hand for loop notion followed by an iterator with a closure.

This implementation iterates over the specified collection, and adds each object returned by the iterator to this collection, in turn.

Such unique features include iterator blocks, parallel assignment, and oddities like the Range class.

The iterator types define the dereference operator to return the object to which the iterator refers.

Pane H is actually contained within a spatial iterator, which allows for multiple header titles to be specified in multiple rows.

You can easily modify the Rope iterator to accommodate skipping forward by more than one character at a time.

Removes from the underlying collection the last element returned by the iterator (optional operation).

This option in particular demonstrates how the event iterator-based API stacks (no pun intended) on top of the cursor-based API.

end Returns an iterator that addresses the location succeeding the last element in a string.

Errors in passing an invalid category of iterator to an algorithm are not guaranteed to be caught at compile-time.

Think of the eachRow method as an iterator on the result of the passed-in query.

This method does not advance the iterator to the next argument.

The element that the iterator points to can be both written to and read from any number of times.

Iterator that moves backward through a sequence. These iterators invert the meaning of and --.

To specify an int variable for an iterator and a String variable for element name, use the code in Listing 17.

For all intents and purposes, you can use an XMLCursor as a java. util. Iterator, except that you can also use it in a generic fashion.

Strive for no more than one call after a single cardinality find on a home, or a next on an iterator retrieved from a collection.

These algorithms require forward iterators for the input sequence and an output iterator for the destination.

Fundamentally, the for loop involves what is known as an iterator, which is used to move through the collection item by item.

A generic iterator function, which can be used to seamlessly iterate over both objects and arrays.

Some of the patterns covered are Singleton, Observer, Template Method, Iterator , and Proxy.

Similarly, if you want to use find, you need only to ensure that the arguments you pass to it are models of Input Iterator.

This listing illustrates an internal iterator (also known as a push iterator because it pushes each element in turn to the code block).

Even as objects get added to the collection, the original Iterator can proceed, working through the items in the original collection.

UnsupportedOperationException - if the remove operation is not supported by this list iterator.

Container operation that returns an iterator referring to the element one past the end of the container.

This iterator adaptor caches the result of dereferencing the underlying iterator.

cend Returns a const iterator that addresses the location succeeding the last element in a string.

UnsupportedOperationException - if the set operation is not supported by this list iterator.

Constructs a vector containing the elements of the specified collection, in the order they are returned by the collection's iterator.

You can use a compound iterator that wraps the iterators that loop through each type of address like the one listed in Listing 3.

This program uses an iterator to read a line from stdin and another iterator to split the line into individual tokens.

The digits following the pane name indicate the spatial iterator value, starting from the outermost spatial iterator working inward.

UnsupportedOperationException - if the add method is not supported by this list iterator.

Without any type of counter variable (or Iterator), you're simply out of luck here.

The iterator pattern provides a way to encapsulate looping through a collection or array of objects.

AL1 - Used in a spatial iterator to insert child navigation links below the first level going from top to bottom.

boost: : filesystem: : path: : iterator: This routine is used to traverse the individual elements of the path.

Subsequent invocations move the iterator backward or forward by the required distance.

Furthermore, it also gets an iterator from the ArrayList and scans through the collection from start to finish.

Provides an iterator over a selected set of nodes.

Those that write to a destination iterator often require only the actions of an output iterator , and so on.

If the iterator is invalid, navigating in a hash table is not possible.

Chapter 4 starts building the iterator framework that underlies the rest of the book.

Parsers extract data from the scanner and position the iterator appropriately through its member functions.

Increments the reverse iterator by the given number of elements.

By incrementing the iterator , each element in the sequence can be processed.

The off-the-end iterator may refer to a nonexistent element, so it must never be dereferenced .

AL0 - Used in a spatial iterator to insert navigation links in the first level going from top to bottom.

Defines an iterator that accesses elements in a container in the reverse direction.

The C standard specifies the minimum iterator category for each iterator parameter of the generic and numeric algorithms.

If an iterator class or a function with static (or global) variables depends on multiple data states, two problems come up.

Algorithms that only read their sequences often require only input iterator operations.

What are the benefits of offering a LValue iterator against a Read Write iterator?

These work the same as the other iterator classes in PHP, but they are specially designed for certain instances.

Part 2 of this series will provide a detailed description of the event iterator-based API.

Interface for an iterator that can access elements in a container only in the forward direction by using the increment operator.

An iterator is a section of code that returns an ordered sequence of values of the same type.

Constant reverse bidirectional iterators can be used anywhere that a constant reverse input or constant reverse output iterator is required.

But the list node is already embedded in the Object, so the memory is directly tracked from the iterator to the Object.

One way to avoid these perils is for your combiner to release any locks before dereferencing a slot call iterator.

Moves the iterator to the next marker in the path.

That can operate over collections, Ruby programmers generally prefer to use iterator methods that pass control to a codeblock.

Returns an iterator over the elements in this list in proper sequence.

Returns true if this list iterator has more elements when traversing the list in the forward direction.

Similarly, vector declares the nested types iterator and const_iterator.

The super method would simply loop through the iterator to compute its result.

Interface and use iterator-like methods on collections themselves.

An iterator can also have parameters to enable clients to control all or part of the iteration behavior.

They also return specialisations of java. util. Iterator, which have extra methods to return specific object types.

The familiar Python idiom for elem in lst: now actually asks lst to produce an iterator.

So with some effort, you can coax an object to behave like both a sequence and an iterator.

With a pull approach, on the other hand, the parser is effectively an iterator for going through the components of a document on demand.

Queries with calls to table-valued functions generate query plans with the Table-valued Function iterator.

Which, if any , of the following iterator uses are in error?

Returns a list iterator of the elements in this list (in proper sequence).

An iterator over the elements in this list in proper sequence.

Why do iterator-range inserts give the strong exception-safety guarantee?

Method to return an iterator over the pairs in the collection.

Create an iterator to iterate through the collection.

The main interface of the event iterator-based API is XMLEventReader.

The function begin() returns an iterator to the first element of the list.

In our example, the developers declare that an Iterator of Customer beans should be returned.

Instead, you provide just an iterator, which simply traverses the data structures in your class.

Of course, there is a trade-off between memory used and the speed penalty of running through the iterator.

Walking the results is a simple exercise in using the Iterator interface implemented by ObjectSet.

Reverse bidirectional iterators can be used anywhere that a reverse input or reverse output iterator is required.

Both the matched and non-matched rows are fed into the upsert iterator.

Any iterator category except output iterator.

The C lexers packaged with the Wave library may be used standalone, too, and are not tied to the C preprocessor iterator at all.

Canceling a task this way is useful if you want the iterator - rather than the task - to control when the scheduling stops.

Iterator has a very simple and many times seen interface.

Bidirectional iterators can be used anywhere that a constant input or constant output iterator is required.

Continue iterator through the list.

Increment the iterator variable iter for each "article" element, as in Listing 20.

No event iterator-based alternative API was provided.

In Blue, ignoring recursion or map (functional iterator), there's one way to implement loop constructs.

The upsert iterator is the one that performs the actual updates or inserts and deletes.

Indeed, dereferencing an iterator from an intrusive list is performed in the same two steps as described above.

begin Returns an iterator addressing the first element in the string.

Returns the range size of the iterator.

The DataTableReader provides a smart, stable iterator.

Creates a collection and later an iterator to loop through.

Returns: true if the iterator has more elements.

One particularly idiomatic method of REXML elements is the . each iterator.

Creates a "named" iterator and indexer pair by using a nested class.

In this case, because the iterator shares the implementation of the data structure, you have complete control over the iteration.

As you already know, the event iterator-based API is a layer that is logically above the cursor-based API.

A Return statement within an anonymous Iterator works just like C#'s yield return.

Part 2 will take a more in-depth look at the event iterator API.

The fan symbol is the iterator for the fans list.

C#'s iterator is a form of continuation, a rarely used technique popular in languages such as Scheme.

Not surprisingly, we can define a reverse iterator only from an iterator that supports -- as well as .

The main problem is that we create a new copy of the iterator every time.

Creates an iterator to loop through.

One such compatible iterator is the RecursiveDirectoryIterator, which is used below to add the files in a directory to the archive.

There are also some iterators, such as istream_iterator and ostream_iterator, that aren't associated with containers at all.

This Error event indicates that a hash table iterator is invalid.

Astute readers might wonder why charAt is more than seven times faster than the iterator, given that both provide O(1) access time.

Listing 8 shows how to extend the Configuration class to implement the Iterator interface, which is internal to PHP.

In this paper, a reusable Web chart framework which was based on XML and JFreeChart was designed by Factory Method and Iterator Pattern.

Statement and continues to the next until the end of the iterator body is reached, or a

The compiler translates this code into the equivalent iterator-based loop, as shown in Listing 2

Use of this custom iterator looks exactly the same as for a true list generated by a function

Instead, you can declare the iterator like this:

For an example of a generic collection class that implements an iterator block, see

However, this pane is contained within a spatial iterator, which is configured to place multiple iterations of the TOOL. n

Class implements the special iterator returned by the latter method, which defines an extra

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The most common example of conditional thread safety is traversing an iterator returned from

Therefore, dereferencing this iterator multiple times will only result in the underlying iterator being dereferenced once;

When the compiler detects your iterator, it will automatically generate the

Add this code to the end of the iterator loop

Statement in the same iterator as in the following example

For loop with any Python object that provides an iterator, including the built-in sequence types such as the

The Gang of Four book defines the Iterator pattern as

Listing 2 shows what the previous iterator example becomes