An iterator is an object-oriented programming pattern which for the most part functions similarly to a pointer to an object inside a collection with the added ability to traverse through the collection in a defined manner, agnostic of the actual implementation or even object addresses in physical ...

learn more… | top users | synonyms

-1
votes
0answers
10 views

template based iterator for read or write permission [on hold]

I want to achieve two different kinds of iterators. On for just reading and the other one for reading and writing. I have some data located in shared memory and I want the possibility to iterate over ...
1
vote
0answers
25 views

Adaptive cyclic database iterator

This is a bit tricky to explain. I'm trying to model a cyclic iterator that would return the next available DataSource(SQL). So infinite calls would just pick the ...
2
votes
1answer
85 views

Iterator requirements for a fake container supporting C++11 range-based for

Around a year ago, I wrote this Stack Overflow answer where I suggested an idea to replace deeply nested loops with a single iterable virtual-container object that "contains" all the indices. The ...
2
votes
1answer
59 views

Wrapping WinAPI FindNextVolume as std iterator

This is my first attempt at creating an STL-style iterator. Is this code ok? ...
0
votes
2answers
73 views

Two permutation iterators for classes in Python with and without a generator

I am just testing out a couple of small classes for learning purposes. Here is my current working code: ...
3
votes
3answers
71 views

Functions taking iterables: peaks, compress, and skipper

I am just testing out a few small functions for learning purposes: ...
7
votes
1answer
64 views

Serialization: Escape Input String

In Json strings characters can be escaped with \\. Here is an iterator that can read such strings and convert the escaped characters to UTF-8 ...
2
votes
2answers
107 views

Bag data structure (a set that can store multiple copies of items)

I am trying to make my class a bit cleaner, especially some of its methods like Count, __add__, ...
5
votes
2answers
223 views

Interleaving values from several iterables

I am new to Python and am trying to see if there is a cleaner way to write my code. The following code take iterables as parameter it produces the first value from the first parameter, then the first ...
4
votes
2answers
171 views

Sorting function that also works with containers having only forward iterators

I was playing around with some code trying to implement a sorting algorithm in C++ that also works with singly linked lists. Since the merge routine of mergesort only scans forward, implementing a ...
1
vote
0answers
41 views

Reversing the “words” of a container with a bidirectional iterator

I posted another snippet of code a few weeks back when I started learning C++. Here's my second try now that I have some time to play with this again. The goal is to write a generic algorithm for ...
3
votes
2answers
135 views

Custom iterator for a linked list class

I have made a LinkedList class. This is a singly-linked-list and I want to make a forward_iterator for this class without using ...
4
votes
1answer
99 views

Sieve prime generator C++

I had some issues with the behavior of the iterator in my prime generator: ...
3
votes
3answers
112 views

Iteritems on a slice of a Python list

iteritems on a dict can useful. Occasionally iteritems is useful for a slice of a list and ...
3
votes
1answer
173 views

StreamIterable - create an iterable from a Java 8 Stream

This seems like an easy thing to mess up, so I'd be grateful if you could think of any edge-cases that I've missed. ...
1
vote
1answer
41 views

Homogenising iterator and const_iterator

I've reworked (for C++11) a section of PyCXX which contained an almost identical iterator and const_iterator. I would like to ...
2
votes
1answer
123 views

ArrayList for Shop implementatin

Problem statement: Design a system for the following scenario: An item list contains item code, name, rate, and quantity for several items. Whenever a new item is added in the list ...
2
votes
2answers
75 views

Handling thread interruptions in a directory iterator

This code is code written on a whim to help $someindividual asking for such a thing on $somechatmedium; what is needed is a way, ...
11
votes
2answers
161 views

Elementwise iterator adaptor

There are many C++ implementations of the Euclidean vector. I.e., a vector in what is typically a 3- or 4-dimensional space. Something along the lines of ...
4
votes
3answers
216 views

Cyclic iterator in both directions

I am trying to make a cyclic iterator that works backwards and forwards. getNext() gets the next array item, getPrevious() gets ...
8
votes
2answers
143 views

Self-made linked list iterator

I recently made a linked list for myself, the code of which was posted here, if anyone would be interested. Now, as the next task, I had to make an Iterator for my ...
1
vote
0answers
52 views

Unrolled linked list with iterator [closed]

I'm making an unrolled linked list (linked list with an array of 50 in each Node) for a class project with an iterator. In addition, whenever more than half of the arrays are unused (they would all be ...
4
votes
1answer
29 views

Finding the next XML element

I am looking for a better way to do a while cycle with the variable update. The background is that I'm writing a StAX-line XML reader in JavaScript and want to ...
7
votes
2answers
140 views

Array-like container for uints shorter than 8 bits (Rev 1)

This is a follow-up to Array-like container for uints shorter than 8 bits In short: The PackedBitfieldArray should be a kind of container for packed (unsigned) ...
11
votes
1answer
144 views

Array-like container for uints shorter than 8 bits

Follow-up: Array-like container for uints shorter than 8 bits (Rev 1) First of all: yes, I need this kind of array to generate data for a piece of hardware, and it must be stored and manipulated ...
7
votes
2answers
300 views

Sorted vector (aka flat_set) for objects (pointers) with custom embedded key (functor used)

BEFORE YOU READ: this link should be included when you just don't like the format of the question and for those that read this question for the first time, the link may give you the idea what happened ...
4
votes
2answers
66 views

Custom MultiIterator with type filter

I'll start with giving a bit of background as there are many classes involved and I can't attach all of them because that would make this question wildly too long. For the curios they can be found at ...
3
votes
1answer
97 views

Return one particular element first, when iterating a lua table

I wish to iterate through a Lua table, but want to get one particular element first always (its key is known beforehand). Since the pairs function does not guarantee the order of a table's elements, ...
4
votes
1answer
91 views

Python caching generator

Is this the correct way to cache a generator in Python, without iterating over it right away (for example using list() over it)? ...
15
votes
1answer
233 views

CircularListCursor - an efficient circular cursor on any list

I have decided to create my own CircularListCursor, because I wanted some abstraction and a ListIterator<E> couldn't give ...
2
votes
1answer
84 views

Graceful way to iterate through two arrays and build a master array?

params[:controller_id].each do |cid| params[:zone_number].each do |pzn| zone_ids << Zone.find_by_controller_id_and_number(cid,pzn).id end end I have ...
10
votes
1answer
324 views

Custom iterator implementation returning OpenCV Mat

I have written an adapter class that allows iteration over the rows of a Mat object from OpenCV. For those interested, here is the Mat documentation, but the ...
6
votes
3answers
206 views

Iterator of iterator

Given an iterator of iterators, return all of the elements from the iterators in order. Looking for code review, optimizations, and best practices. Verifying complexity to be \$O(n)\$, where \$n\$ is ...
5
votes
3answers
174 views

Iterator for a list of objects

Given a list of objects, return an iterator for such a list. Looking for code-review, optimizations and best practices. Verifying complexity to be O(n) where n is sum of all objects, including ...
5
votes
3answers
662 views

Linked list with iterators

This is my second linked list implementation for review. I rewritten pretty much all of this and have added iterators, sentinels and The Rule of Five. Please let me know what's wrong with it; I am ...
4
votes
1answer
107 views

Container which iterates a range or a list

I have made some composited container Range which accepts either a min/max range as a std::pair or a set of integers as a ...
4
votes
2answers
137 views

Recursive flatten with lazy evaluation iterator

I'm trying to rewrite this: ...
3
votes
5answers
535 views

A deduplicating iterator

Implement an iterator(Generic) which skips an element if it is equal to the previous element. e.g : AAABBCCCCD, produces ABCD. Below is my attempt. Please suggest improvements. ...
11
votes
3answers
5k views

Simple Example of an Iterable and an Iterator in Java

I was a TA for a first-year Java programming course this year. As a very simple example of iterables/iterators, I wrote the following code for the students. I am curious if any styling or other ...
10
votes
2answers
761 views

Using a Pythonesque range() generator function with the Java foreach loop

Now that we have the nice new foreach loop in Java, the old-style loop looks ugly be comparison. I like the way Python has a ...
2
votes
2answers
2k views

Iterator for binary tree - pre, in, and post order iterators

Implemented iterator for a binary tree and "pre" "in" and "post" order flavors. I'm looking for code review, best practices, optimizations etc. ...
7
votes
2answers
380 views

Iterator class using a square list

I am trying to implement squarelist by using iteration that points to the head element. I've create this iterator class to make my iterator id directional. I just want to see if I implemented it ...
2
votes
2answers
3k views

Creating linked list data with iterator pattern

I've created a linked list to use it in SquareList. I've started to create a linked list based on just that. I want my class to follow the iterator pattern. How can it be improve to use vector ...
3
votes
1answer
138 views

Serializing tabular data in ruby — is map, flatten, hash the correct approach?

I wanted a hash which lets me reference Japanese syllables by their romanized names. In hindsight I could have searched for an existing one column table, but I wanted to improve my ruby by writing a ...
1
vote
0answers
145 views

REST Response: Checking for Success and Error

I thought this was pretty slick - maybe not, I just wanted to share and maybe get some feedback: As part of a REST client class: Accepts the JSON response from REST or REST-like service, searches ...
8
votes
1answer
303 views

Iterator adaptor for iterators returning tuple-like values

Today, I will require your help to improve an iterator adapter. The goal of the adapter (I called it get_iterator) is to adapt ...
3
votes
1answer
8k views

Iterator Implementation

I had to write my own iterator implementation for my structure which has ArrayList<Vector> field. An iterator is supposed to iterate over mentioned ...
0
votes
1answer
380 views

Filtering a long list of files through a set of ignore patterns using iterators

I have a backup job that walks across a huge directory with potentially millions of files. Python's os.walk() works just fine. Now, I have implemented a feature to ignore files based in a black list ...
4
votes
3answers
3k views

Flatten iterator for nested list

Given a list which can can contain elements as well as lists, write an iterator to flatten a nested list. Please make this code better and suggest any improvements. ...
3
votes
2answers
100 views

Remove item from a list, which (of the 2) methods is better?

I have a List, and I have to delete one item from the list when I find it. I am using the code below to do that: ...