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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votes
1answer
46 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
55 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
votes
1answer
49 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
votes
1answer
46 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 ...
8
votes
2answers
123 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 ...
0
votes
2answers
90 views
Implementation of Vector in C++
This is a simple implementation of vector in C++. Please offer your reviews to improve the code.
...
4
votes
3answers
137 views
Using an IEnumerator without a foreach loop in order to simulate a state machine
I am working with an object that needs to run an ExecuteEffect() method. Sometimes, the ExecuteEffect() only needs to run once, ...
7
votes
3answers
304 views
Implementing xrange
I wanted to learn about Iterable and Iterators and hence thought about getting my hands dirty rather than reading theory and ...
8
votes
2answers
203 views
Iterating over Dungeon Map
I'm working on an RPG so of course I have to have some dungeons. I've got the dungeon generation working, with the output being a DungeonTileType[][].
Now I ...
8
votes
1answer
75 views
Chain multiple containers
Python has itertools.chain(), but C++ has nothing. This is my attempt to implement such a thing. Looking mainly for comments about potentially smarter ways of doing ...
6
votes
3answers
55 views
begin and end overloads for istream_iterator
I wrote this pretty straight forward begin and end overloads for istream_iterator.
Is this standards compliant? Any problems with usage?
...
6
votes
2answers
342 views
Implement Java hasNext() and next() in C++
Recently came upon this question asked in interview with major tech company.
Implement Java's next and hasNext function in your favorite
programming language.
Here is the solution I came up ...
5
votes
2answers
401 views
3
votes
1answer
47 views
Directed graph path enumerator in Java - follow-up
I have refactored the graph path enumerator. DirectedGraphNode was not changed, so refer to the link above in case you want to have a look at it. The node type is ...
4
votes
2answers
78 views
Directed graph path enumerator in Java
I have this iterator class that expects in its constructor two directed graph nodes, source and target, and upon each ...
3
votes
1answer
85 views
Chaining function for range-based for loop
Motivation: I'm relatively new to C++. I'm writing a function meant to be used with range-based for loops. The goal is to be able to iterate over multiple containers at once, each in turn (essentially ...
3
votes
3answers
95 views
Linked list implementation - follow-up
Follow-up to this question as recommended.
Can this code be improved from an OOP paradigm perspective?
...
1
vote
1answer
74 views
OOP paradigm implementation of a linked list
Can this code be improved from an OOP paradigm perspective?
...
1
vote
2answers
66 views
Simple and concise new iterator design [closed]
I came up with a new iteration pattern for a C++ API that aims at simplifying client code.
Basically, when developers have an iterable object myCollection, they ...
6
votes
1answer
65 views
Return the element of collection if the collection contains only one element
Recently I have found in my code several places where I was first gathering some solutions, and then continued processing them only if the solution was unique (solution collection contained only one ...
2
votes
2answers
53 views
Python script to read CSVs and regroup it into the data types I need
This code does the following:
Read CSV file and determine sub_type based on series_desc.
Turn row into dictionaries ...
2
votes
1answer
81 views
Idiomatic iterator for a linear function
A while back, I asked a question about implementing an idiomatic iterator in C++. I've recently revisited the code, and I'm bothered by the duplication in the begin and end iterators. The code goes ...
0
votes
1answer
57 views
Sieve32, a simple 32 bit sieve returning IEnumerable<uint> using C#
What a difference 1 bit makes! This very fast, simple sieve of Eratosthenes quickly finds 32 bit primes. It uses a memory efficient BitArray for odd numbers – but ...
11
votes
2answers
190 views
Sieve31, my sieve of Eratosthenes returning IEnumerable<int>
This very fast, simple sieve quickly finds 31 bit primes. It uses a memory efficient BitArray for odd numbers.
How a 32 bit ...
1
vote
1answer
61 views
A non-static Sieve of Eratosthenes class, version 1
Over the years I’ve seen many C# sieves and despite their varying internals all that I have seen invariably are a static method that returns a List<int>, ...
2
votes
3answers
470 views
Thread-safe Iterator wrapper
Aside: This code assumes a class Option that can be Some or None to represent the presence (Some) or absence (None) of the value it contains. Haskell calls it Maybe.
Here is my first pass at ...
1
vote
0answers
53 views
Array slice type in Java - follow-up
See the previous iteration.
I have essentially fixed most of the issues mentioned by maaartinus. However, I left the size field as it is. Namely, if the user wants ...
3
votes
1answer
140 views
Array slice type in Java
Edit See the next iteration at Array slice type in Java - follow-up.
I have this "slice" type for managing array subranges. It is kind of the same thing as Pythons slice notation, yet I did not add ...
11
votes
2answers
157 views
Streaming int support
This recent question Print Consecutive numbers by comparing two parameters frustrated me because I could not find a convenient way in Java 8 to support the conditions that are required. I answered it ...
0
votes
2answers
110 views
Iterator to remove duplicate element
The code implements custom iterator, which skips duplicate integers. The array expected is to be sorted.
...
2
votes
1answer
69 views
Avoid branching code for degenerate cases in Fibonacci generator
I was writing a simple function that would return the Fibonacci sequence up to the nth term and for whatever reason started wasting a lot of time on it. Here's what I came up with:
...
5
votes
0answers
101 views
Functional tree iteration in Common Lisp
I'm adding some functionality to an existing library of data structures in Common Lisp, with a view to asking the original author if I can take over maintenance and development of it. While the ...
3
votes
2answers
118 views
Modern C++ compliant insertion sort
This is a kind of follow up to my previous sort implementation question with specific questions to insertion sort, and Modern C++ idioms. Anybody seeing this post can see how I got to this modern ...
5
votes
2answers
465 views
Doubly linked list: iterator/pointer arithmetic
I'm using a doubly linked list container I've written as the working example. The textbook I'm using is from 2001, so feel free to point out where later versions of the C++ standard should be used ...
2
votes
1answer
53 views
Extract incomplete weeks from a DateTime collection
The code below attempts to extract incomplete weeks from a List<DateTime>.
For example, a list containing all the days in Jan 2015 would result in the 5th to ...
3
votes
1answer
53 views
AdjacentElementsIteratorAdaptor for Random Access Iterators
Inspired by this comment I decided to implement an iterator adaptor that takes another iterator and returns each element and a given number of its neighbors.
The final solution should be applicable ...
4
votes
2answers
89 views
Iterating over the lines of a stream
This structure is supposed to iterate over the lines of an input stream, using std::getline. Any remark is welcome!
...
1
vote
1answer
125 views
Efficient use of LINQ - Indexing
I have a Class with a List of objects, and those objects contain a list which has lists to objects in the first class, and I'm trying to quickly index them. Simplified:
...
10
votes
2answers
258 views
Lazy String.Split
C#'s String.Split method comes from C# 2.0, and lazy operations weren't a feature back then. The task is to split a string according to a (single) separator. Doing ...
1
vote
0answers
35 views
A context-based partition_copy
I recently posted a question on Stack Overflow asking how I could go about implementing a context-based partition copy. I actually came up with my own solution, but I would like to see if it could be ...
2
votes
1answer
48 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
186 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 ...
3
votes
1answer
87 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
135 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
202 views
Functions taking iterables: peaks, compress, and skipper
I am just testing out a few small functions for learning purposes:
...
7
votes
1answer
151 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
325 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
256 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 ...
3
votes
2answers
895 views
Uppercase the initial char of every string in a list
My problem is that I have a sequence, potentially infinite, of strings. Let's suppose it to be
{"Mickey Mouse", "Bugs Bunny", "Winnie the Pooh"}
I have to make ...
6
votes
3answers
167 views
Classify values depending on predicates
I've to do a generic method Classify<T> that, given a sequence of elements of type T and an arbitrary number of ...
