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 ...

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C++ Syncronous Poll Wrapper v2

I recently asked for some feedback on my design for a syncronous wrapper around linux sockets and poll Based on the feedback, I created a new (hopefully more idiomatic) design. socket.h ...
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49 views

Phishing Project UserIterator Implementation

As I stated in an answer comment on my previous question, the UserIterator has a much larger footprint than I think most people realize. This question is here to further explain the project, the ...
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3answers
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QuickSort C++ Implmentation using Iterators #2

This is part 2 of the previous question asked which is at - QuickSort C++ Implementation using Iterators. Based on Jerry Coffin's answer, I have made the changes except for using templates. ...
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QuickSort C++ Implementation using Iterators

I implemented quicksort using iterators. I am will be grateful, if someone can review my piece of code. BTW, I am just selecting the last element as the pivot (which I plan to randomize later) I am ...
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1answer
95 views

Splicing enumerables together

Basically, what I mean by splice is to take an array of Enumerables, take the 1st element from the first one, then the 1st element from the second one, and so forth, until we come back to the 1st ...
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2answers
70 views

Python lazy dict with iterator in constructor

This question began as an off-topic answer to this question, but the code here serves a different goal. I wrote the following class for the purpose of populating a dict on demand from an iterator. ...
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1answer
101 views

IEnumerable and Predicate sets in .NET (complete, explained)

See a revised version in the answer below GitHub Repository Previously: Countable and uncountable sets in .NET (clean version). Thesis There is a full featured support of countable sets in .NET:...
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1answer
45 views

ExtensionMethods for iterating hierarchically data structures depth/breath-first

I wrote a few simple extension methods that allow to traverse a hierachically data structure depth-first or breath-first using LINQ: Usage: ...
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1answer
70 views

C++11 Quicksort any container

As the title says, simple quicksort to help myself get used to C++ templates and iterators. Main concern is whether there's a better way to template so that you can have a simple function (e.g. ...
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1answer
59 views

Convert a dictionary of iterables into an iterator of dictionaries

I have a user-editable dictionary of content used to fill in a string.Template and I wanted to allow the user to fill the same template with several values at once. ...
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54 views

Scan over parameter iterator for model simulation

I'm writing a small Python application that performs model simulation for many different parameters. The iterator of parameters isn't completely known ahead of time. Rather, the iterator needs to ...
4
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1answer
414 views

A Rust iterator to match and replace subsequences

I needed to do transformations on a data stream, not on an element-by-element basis, but on subsequences. This is what I've come up with: https://github.com/peterjoel/rust-iter-replace/blob/master/src/...
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0answers
118 views

A general iterator to replace “non-standard” C-style for loops

Since the deprecation of C-style for loops in Swift 2.2 (and the removal in Swift 3), several questions about the possible replacements were asked on Stack Overflow. In most cases, a ...
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2answers
68 views

Standard deviation from iterators

I want this to be similar to the STL algorithms but I don't find it elegant nor concise at all: ...
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0answers
87 views

Finding a Cartesian product of multiple lists

I came up with an extension method to find a Cartesian product of multiple IEnumerable sets. I was able to achieve lazy enumeration via ...
2
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2answers
90 views
2
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3answers
217 views

JavaScript Iteration

In my current project I have objects of the following structure: CanvasBundle - Object Some elements... gridCanvas axesCanvas ...
3
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2answers
108 views

Custom C++ iterator

So I have written a custom iterator for std::map that allows access to just the "values" of the map and I was wondering if it is the "correct" way to implement <...
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2answers
94 views

Input iterator in C++

For educational purposes and to understand how iterators are working in C++, I've create an input iterator and I would like others to look at and provide any feedback on my code. ...
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0answers
45 views

An iterator returning all possible solutions to n-queen problem in Java - follow-up

(See the initial iteration.) Now I have slightly improved performance of the iterator. Whenever we have set a queen at a particular board cell, the previous iteration sacrifices \$\mathcal{O}(n)\$ ...
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0answers
42 views

An iterator returning all possible solutions to n-queen problem in Java

(See the next iteration.) Given a positive integer \$n\$, I have an iterator that returns all possible solutions to \$n\$-queens problem one by one: QueenIterableV1.java: ...
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1answer
91 views

Yet another Pythonic range implementation for C++

I recently had the need to loop from zero to some limit only known at runtime. Instead of writing: ...
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55 views

Exposing Iterators while Trully Hiding Their Implementation

While implementing classes composed of various collections, I've found that it's pretty hard to completely hide the type of collection used, while still allowing C++ style operations on iterators. ...
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1answer
133 views

RFC 4180-compliant CSV parser in Java

While looking at a recent question, I realized that there is no CSV parser in the standard Java library. I decided to write one that complies with RFC 4180. Highlights of the standard include: ...
6
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1answer
153 views

An iterator returning all possible permutations of a list in Java

I have this class that iterates over all permutations of an input list: PermutationIterable.java: ...
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2answers
159 views

Combination generator in Java - 2nd iteration

I have refactored the previous combination generator, and now it is an iterator returning combinations as lists. It hides larger constant factors as the previous version, yet it is really easy to use: ...
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2answers
39 views

multirange iterator

I'm doing some boring math with lot of sums over lot of variables. So, instead of nesting for loops I have decided to use something like this: ...
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2answers
64 views

Split up an iterable into batches

I was writing a program that had a list of e-mail messages. It needed to group them into batches, with the condition that each batch must have at max 20 messages, and be maximally 50k in size (no ...
8
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1answer
96 views

Scala implementation of @rolfl's integer-partitioning algorithm

While reviewing @Martijn's Distinct sums of integers (finding all combinations of positive integers that sum to a given number), I proposed the following solution: ...
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4answers
980 views

Flags on steroids

What is so bad about [Flags] enum? It does not support IEnumerable<T> anyhow, so to get one we need to use syntax like (...
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443 views

Range iterator in ES6 similar to Python and Ruby for

Background and Purpose For those unaccustomed to Ruby, Ruby supports range literals i.e. 1..4 meaning 1, 2, 3, 4 and ...
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Finding if sequential numbers for total exists

Question: Given a sequence of positive integers A and an integer T, return whether there is a continuous sequence of A that sums up to exactly T Example: ...
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1answer
125 views

Max element of input iterator range

I came across this SO question on why std::max_element requires a ForwardIterator (as apposed to an ...
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1answer
99 views

Let's “Iterator” through Fibonacci, forever and ever

Following-up to my previous question, this class is now based on an iterator. The class, instead of forcing the programmer to use up a bunch of memory just to get each progressive number once, they ...
11
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1answer
81 views

iterating over the values of a list of ordered dictionaries

I am facing the following problem: I have a special data structure that is a dictionary whose keys are integers (dimensions). The values are also dictionaries whose keys are strings (geometric types) ...
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43 views

Using the llvm::iterator_adaptor_base

I'm currently working with the LLVM JIT framework. There is some graph I had to implement for internal cost bench-marking. It has cyclic node dependencies, so I have to use ...
5
votes
2answers
285 views

Mapping & Sorting Randomly Generated Numbers

Below is the assignment I was given and the coding is what I have came up with. I would appreciate criticism on how I did and on ways to have gone differently about it. You want to number your ...
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votes
2answers
344 views

Random access iterator for custom data type in C++

I am working with an array-like data container through a 3rd party API. So I can not change the container itself to add iterators. There are many different array-like classes, and each have a specific ...
5
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1answer
102 views

The final word on contiguous iterators

Following the paradigms of SCARY iterators, there should only be a single iterator-type for contiguous iterators per value-type. Here my code for that iterator, working with C++11+: ...
5
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1answer
89 views

Pythonish integer range in Java - follow-up

(See the previous iteration.) I have refactored the Range; now it looks like this: Range.java: ...
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3answers
1k views

Pythonish integer range in Java

Introduction After getting stuck with a Pythonish integer range in C++, I rewrote the facility in Java. In Python you can say: ...
5
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1answer
139 views

Pythonish integer range in C++

Python has that range: >>> range(10, -20, -3) [10, 7, 4, 1, -2, -5, -8, -11, -14, -17] I have this C++ implementation of exactly the same facility: range.h: <...
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3answers
57 views

Reimplementing enumerate() to produce a sequence or iterator

Apparently it is possible to implement enumerate so it produces a sequence when given a sequence, and produces an iterable otherwise. Sequence can be safely ...
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2answers
140 views

Singly-linked list implementation with iterators

Taking into account everything you guys told me last time I posted, I came up with this implementation of a singly-linked list, in which the first and last elements are known. I tried to make the ...
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votes
2answers
433 views

Filtered Iterator

I have written a wrapper for Java's Iterator class using Java 7, which is designed to only iterate items that match a certain filter. When the filter is null, all ...
6
votes
1answer
70 views

Improving multiple assignment using an iterator function

Often I need to perform multiple assignment from a sequence (e.g. from the result of a split()) but with some semantics that, AFAIK, are not available in the ...
3
votes
1answer
135 views

Binary trees in Rust: more iterators! (non-consuming variant)

This is a follow-up to Binary trees in Rust: iterators, where Shepmaster suggested that I implement a non-consuming iterator. This was relatively straightforward. I chose to mirror the design of the ...
5
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1answer
386 views

Binary trees in Rust: iterators

This is a follow-up to Basic binary tree manipulation in Rust, where Shepmaster suggested that I implement the Iterator trait for the binary tree. This ended up ...
6
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1answer
61 views

Saving and resuming position while iterating over a container

Background: I'm in the process of writing a relatively simple behavior tree driven AI system for a game that I'm working on. Basically, the behavior tree is made up of individual gameplay tasks (move,...
8
votes
2answers
158 views

Yield statement in a using block from a clarity point of view

I want an opinion of the community about readability and maintainability of the following code. This is quite a rare case when yield statement included in a using construction. I know that this code ...