All Questions
Tagged with container or collections
355 questions
1
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A unique_ptr-like class, for spans instead of raw pointers
Introduction / Motivation
I like the CADRe (a.k.a. RAII) resource management idiom in C++. And I like std::span's; or perhaps I should say, I dislike the use of ...
- 2,035
3
votes
0
answers
136
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Simulating Objects with Collections in VBA
Background
I am writing a VBA module which requires the functionality of a custom object. This object will support "regular" functions (UDFs) within the module.
Due to reasons beyond the ...
- 529
5
votes
1
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118
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Update Member "In Place" within VBA Collection
Background
I encountered this issue a while back, where I tried to "set" the value of a member "in place", without changing its position within the ...
- 529
5
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2
answers
965
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Optimized data structure mapping finite set of integers to values in C++
I'm looking for a mapping data structure, but knowing that the possible values of my keys are small numbers, I would like to trade memory for better performances (for both random access and value ...
- 611
4
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1
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66
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Implementing Intersections data structure that is able to hold a container of multiple types that maintains order in C++
I am trying to implement a way to store intersections of rays with arbitrary objects. So far I thought I could make the object derived from an interface and put that as the type in the Intersection ...
- 41
6
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2
answers
94
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TypeScript Number Set
I originally premiered this code to the internet in this StackOverflow post, and per a recommendation through one of the comments, I am reposting it here.
I am making a floating-point number set ...
- 161
6
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3
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1k
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Simple Container Class
I'm learning C++ and trying to create my own container class just for practice (I know about vector, list, map, set). I plan to improve this class and add new methods as I learn new material. Please ...
- 161
2
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1
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87
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Generic container wrapper type with a default underlying buffer (2nd rev)
This is a revision of the previous question. I was told to ask an additional question with more context for the modified code to be reviewed.
The changes:
changed from ...
- 935
2
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1
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62
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Looking for feedback on a flavour of Radix tree I wrote. This is version 2 of the class original posted on this forum
My project explores some ideas i've had regarding alternate data structures to the unorderd_map and map, and aiming the exploration to key sets with a non uniform distribution and key sets with common ...
- 61
4
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1
answer
192
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Looking for feedback on a flavour of Radix tree I wrote. The idea is speed on find() time if keys share common prefixes and are known ahead of time
My project explores some ideas i've had regarding alternate data structures to the unorderd_map and map, and aiming the exploration to key sets with a non uniform distribution and key sets with common ...
- 61
2
votes
1
answer
52
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A collection based on a bitset to store a set of unique integers from a given range (rev. 3)
All right, let's do this one last time.
This is continuation of this review.
I applied most of the proposed changes, making interface of my container very close to that of ...
- 177
4
votes
1
answer
86
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A collection based on a bitset to store a set of unique integers from a given range (rev. 2)
This is a continuation of this review. I applied most of the proposed changes.
These changes were focused mostly on decoupling the class from the rest of the program and making its interface more like ...
- 177
2
votes
3
answers
121
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A dynamic array with an iterator compatible with std::sort
I wrote a Vector (dynamic array) class with an iterator usable with std::sort() . It seems to pass my tests.
I wondering about the issues one can spot on this ...
- 119
1
vote
1
answer
86
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Collection that uses a bitset to store a huge set of unique integers from a given range (rev. 1)
Some (skippable) context:
I'm writing program that minimizes an arbitrary logical function. Such function takes an unsigned integer as an argument and returns either ...
- 177
1
vote
1
answer
133
views
SynchronizedObservableCollection: a thread-safe ObservableCollection
After reading many people talk about the need for a SynchronizedObservableCollection and their implementations I decided to roll my own. I wanted to add a ...
- 402
3
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1
answer
131
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std::list reimplementation for practice
I used cppreference list to implement this simplified std::list.
The CXX_STANDARD is 11.
My questions are the usual:
Is the ...
- 39
3
votes
2
answers
425
views
C macro based dynamic array library
This library is a fork of eteran/c-vector. It is macro based, so that it is generic, without void pointers and additional functions. This of course means that it has the downsides of macros in C. The ...
- 41
4
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2
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157
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Sort a dict by keys, assuming keys are orderable
I found a suspicious code snipped in an existing project in which I am involved as a developer. The code sorts a dict by its keys, so that if iterated over the dict,...
- 161
3
votes
1
answer
474
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Yet another sparse set implementation
I got inspired by this blog post and implemented a fixed-size sparse set, removing the need for vectors, because the sparse set's size equals at least ...
- 33
6
votes
2
answers
1k
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A not so simple C++20 circular queue
This container reduces the number of memory allocations on queue-type operations (push + pop) compared to std::deque. Basic performance tests indicates a performance similar to std::deque where main ...
- 409
2
votes
1
answer
242
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Simple C++ circular queue
I wrote a simple C++20 circular queue.
https://github.com/torrentg/cqueue
Here is cqueue.hpp
...
- 409
0
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1
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49
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Iterating over JSON more effectively
Problem:
I need to get data from JSON file containing information about "contributors". Each contributor has an atrribute jobs, which is a list of string-...
- 301
1
vote
1
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109
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Class that wraps a collection and tracks if its elements were visited
The VisitedCollection is a collection wrapper for setting and tracking if elements were visited (removed in terms of the wrapper)
I have concerns regarding:
should ...
- 244
2
votes
3
answers
171
views
How to efficiently build an object from list or array of strings
I am working with an API that delivers some data in a QStringList or basically a list of strings. The data contains keys and values but it is not a ...
- 121
1
vote
2
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656
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Implemented Sorting of Map by Value and then by Key in java
So I had this requirement to get the frequency of names appearing in a list
and then print the one appearing the most number of times. If there is a clash, print the one which comes first in the ...
0
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1
answer
1k
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std::list implementation learning exercise
I want to improve my algorithms and data structures in C++ understanding and also learn how the standard library containers are implemented. I implemented a std::vector in a previous review and this ...
- 2,439
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1
answer
2k
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Faster way to find items from one list in another one [closed]
I would like to check if a string appears in a list of strings. For that, I have chosen the List<string> type, as follows:
...
- 301
5
votes
1
answer
305
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C smart string implementation using preprocessor
I have wrote a smart string container implementation for use in my application, but as I'am not such professional C programmer I have doubts about is I'am did it right and is there ways how to improve ...
- 53
5
votes
2
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204
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std::vector implementation learning exercise
I want to improve my algorithms and data structures in C++ understanding and also learn how the standard library containers are implemented. This resizing_array is based on the std::vector.
My ...
- 2,439
-1
votes
1
answer
82
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Most efficient way to track a collection of targets in range of a source object [closed]
In my game there are space ships and each of these space ships tracks which other ships are in range of it. I need to perform certain logic when a target ship comes in range of another ship, and ...
0
votes
1
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246
views
Action on each element of an inline list
I'm trying to learn the "functional" part of C#/.Net for work, and I'm not sure if this is a good way to write this statement.
I was also trying to reduce duplicated code while not ...
- 91
3
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1
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89
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C Typed Vector that implements type-safety, encapsulation and lazy initialization
C Typed Vector
I wasn't happy with the various dynamic array / vector implementations in C, so I made my own. In general, I'm not the biggest fan of C-preprocessor madness, but alas for this ...
- 171
3
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0
answers
241
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Implementation of Dynamic Array with allocators and C++20
To train my skills in C++, I decided to implement the well-known "Dynamic array" data structure on my own. I realized early on that using pointers or smart pointers is wrong, as it leads to ...
- 131
3
votes
2
answers
427
views
Prime numbers iterator
I am not familiar with iterators. I am confused with the traits approach and the traditional one. I don't know which one I should use in 2021.
I wrote a minimal ...
- 1,099
7
votes
1
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348
views
Custom implementation to provide an immutable range of a container without copying it
I needed to pass a const reference to part of a std::vector without copy. I posted the previous version in my earlier question, thank you for the great support! As ...
- 405
1
vote
2
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106
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Is there a way to simplify getting the character that appears the most in a collection with Linq?
I have a collection of strings, all of which are three characters in length:
...
- 929
2
votes
1
answer
1k
views
Python script to automate the creation of Linux LXC containers
Like the title suggests, I wrote a script in Python that uses the python3-lxc library to automate the creation of Linux LXC containers. I realised that containers ...
- 173
1
vote
1
answer
1k
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A multi key/value type "folded" map class template
I have recently come across a use case where I need to lump many maps into a single container. These maps can have different combinations of key/value types, but they all differ from one another.
For ...
- 173
1
vote
1
answer
79
views
R Container for Multiple data.frame with a Brief Description of the Content of the data.frame
For a project I have a large dataset with a multitude of variables from different questionnaires. Not all variables are required for all analyses.
So I created a preprocessing script, in which subsets ...
- 113
5
votes
2
answers
2k
views
Hash table implemented in C with open addressing
While posting this, I noticed there are quite a few similar C hash table implementations here already. So I figured one more wouldn't hurt. :-) In any case, I'm writing a teaching article on "how ...
- 629
3
votes
1
answer
356
views
Take element of a Set collection depending on the value of another element
I had to populate the fields of a Service object using a Set (HashSet) with any configuration parameters -> ...
- 33
2
votes
1
answer
44
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An exercise concering Kotlin Set
Task description:
Declare a function twoInThree(a: Set, b: Set, c: Set), which returns the set of all elements, which are contained in exactly two of the three given sets a, b, c.
My solution:
...
- 4,516
4
votes
1
answer
107
views
Data set with many variables in Python, many indented dictionaries?
I am working with a data set that has many variables. Currently I am storing the data in many indented dictionaries in the following way:
...
- 143
2
votes
1
answer
963
views
Generic hashmap with dynamic resizing and collision handling
This is a (more or less) continuation of a previous post I made: Generic implementation of a hashtable with double-linked list.
I got lots of valuable feedback, so I decided to rewrite the entire ...
- 901
4
votes
2
answers
1k
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C++20 "FixedArray" Container (dynamically allocated fixed-size array)
I've wrote a FixedArray to fit seamlessly (function-wise) with the default C++ containers, including working with algorithms/etc. It is a dynamically allocated, but fixed size array.
Code
...
- 107
2
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1
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144
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Print the App Name Using Latest Version
I am trying to solve a problem, where we are given an app name, service name, and version number of an api. We need to print the name of app, which is using the latest version for most of the service.
...
2
votes
1
answer
941
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Generic Doubly Linked-list implementation in C++
I am just learning about C++ templates and generic types, I decided it would be nice to try to create a generic container class as a challenge and test my knowledge in the process. Here is what I have ...
user228914
10
votes
2
answers
130
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Using Method Chaining To Alter Last Item Added To Collection
There is a Name class with properties that represent different components that make up a person's name. A Name object requires a FirstName and ...
- 223
5
votes
1
answer
4k
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Java group list of maps by value and insert as grouped list
Not sure if I am overcomplicating the requirement but this is what I need (for simplicity I will show a the List<Map<String, Object>> as a ...
user9492428
1
vote
1
answer
149
views
Dictionary or custom Collection
I have a list of rule names coming from .xml file. These rule names needs to be validated against rule names in database (Validator.cs). If valid, then ...
- 335