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Q&A

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

General Q&A about programming, scripting, software design & architecture, process, tools, testing, and more.

Filters (None)
71%
+3 −0
Understanding "de Morgan's laws"

While trying to understand logical 'or'/'and', I encountered another problem (I'm writing Python code here, but my question is about the logic, not about any given programming language). I have som...

1 answer  ·  posted 7mo ago by Karl Knechtel‭  ·  last activity 7mo ago by Karl Knechtel‭

language-agnostic logic
81%
+7 −0
Common string handling pitfalls in C programming

This is a self-answered Q&A meant as a C string handling FAQ. It will ask several questions at once which isn't ideal, but they are all closely related and I'd rather not fragment the post in...

2 answers  ·  posted 3y ago by Lundin‭  ·  last activity 7mo ago by Karl Knechtel‭

c string string-literals string.h
50%
+1 −1
How to Suppress System Sound for Keyboard Shortcuts in C++ Desktop Application [closed]

In my desktop application developed in C++, I am encountering an issue where pressing the Ctrl + X, Ctrl + Shift + X, and Ctrl + D shortcut keys triggers a system sound. I would like to suppress o...

0 answers  ·  posted 7mo ago by Junior_Dev‭  ·  edited 7mo ago by Alexei‭

c++ windows winapi
60%
+1 −0
Generating combinations of elements, which are themselves sequences of the same length, where the elements have no value in common at any position

This question is adapted from a question I just helped fix up on Stack Overflow. I'm giving a different motivating example which I think will make it clearer what the requirements are and why a n...

2 answers  ·  posted 7mo ago by Karl Knechtel‭  ·  last activity 7mo ago by Karl Knechtel‭

python algorithms combinatorics
71%
+3 −0
Do Where and OfType preserve List capacity?

Unless I am mistaken, myList.Select(a => a).ToList() initializes the resulting list to the capacity of myList.Count. Does myList.Where(a => true).ToList() do so or does it build up from the i...

1 answer  ·  posted 7mo ago by LyndonGingerich‭  ·  last activity 7mo ago by rcmosher‭

c# linq iterable list
66%
+2 −0
Can UWPNuGetPackages be moved to another drive?

I'm trying to make a UWP app in Visual studio, but the NuGet package files have been huge. They just don't fit on my SSD, but I do have an HDD I could theoretically use. After a bunch of tinkering...

1 answer  ·  posted 3y ago by Ullallulloo‭  ·  last activity 7mo ago by Alexei‭

visual-studio nuget
66%
+2 −0
Why are model_q4.onnx and model_q4f16.onnx not 4 times smaller than model.onnx?

I see on https://huggingface.co/HuggingFaceTB/SmolLM2-135M-Instruct/tree/main/onnx: File Name Size model.onnx 654 MB model_fp16.onnx 327 MB model_q4.onnx 200 MB m...

1 answer  ·  posted 7mo ago by Franck Dernoncourt‭  ·  last activity 7mo ago by Derek Elkins‭

machine-learning onnx quantization language-model
91%
+20 −0
What is C23 and why should I care?

The C language has gone through many iterations and the latest one not yet released is informally called "C23", supposedly because they hoped to release it in 2023. The latest draft version N3096 i...

1 answer  ·  posted 2y ago by Lundin‭  ·  edited 7mo ago by Lundin‭

c c23
50%
+0 −0
Cannot read properties of undefined (reading 'map') error in MERN stack project

In my project, I try to fetch data from the backend to display in the frontend using fetch API. Each time I do this I get Cannot read properties of undefined (reading 'map') error. When I check the...

0 answers  ·  posted 7mo ago by emmaluga‭  ·  edited 7mo ago by Alexei‭

reactjs react-hooks
60%
+1 −0
I can't install the Spacy library using the terminal in VSCode on Windows 10

I am trying to install the Spacy library in VSCode in a folder with a virtual environment. The output appearing in the terminal is excessively long; I will share it with a pastebin later. My versio...

1 answer  ·  posted 8mo ago by Richard‭  ·  last activity 7mo ago by Alexei‭

python visual-studio installation terminal spacy
60%
+4 −2
Which platforms return a non-null pointer on malloc(0)

What is the portability of malloc(0);? Which platforms return NULL without setting errno? Which platforms return a non-null pointer? Do any platforms have some other behavior?

2 answers  ·  posted 8mo ago by alx‭  ·  last activity 7mo ago by Alexei‭

c malloc
75%
+4 −0
What does an exclamation mark mean in a GraphQL schema?

Types are often followed by exclamation marks in GraphQL schemas. What do they mean? type User { id: Int! email: String! name: String! updatedAt: String! createdAt: String...

1 answer  ·  posted 8mo ago by Iizuki‭  ·  last activity 7mo ago by Alexei‭

syntax graphql
80%
+6 −0
C#: Performance hit from using calculated property instead of get-only property with initializer?

JetBrains Rider suggests that I change this (for example): public class Foo { public int OnePlusOne { get; } = 1 + 1; } to this: public class Foo { public int OnePlusOne => 1 + 1...

1 answer  ·  posted 8mo ago by LyndonGingerich‭  ·  last activity 7mo ago by Michael‭

c# attribute
71%
+3 −0
Recursive traversal of composite tree of mutable "trait objects"?

I'm working on a background service/daemon for an embedded device, in Rust. The daemon manages several hardware components and these are structured using the Composite design pattern. The composite...

2 answers  ·  posted 11mo ago by ghost-in-the-zsh‭  ·  last activity 7mo ago by ghost-in-the-zsh‭

rust
66%
+2 −0
LocalDate format in fields stored as json via Hibernate

Setup I have a database table with field of JSONB type. I access said database using Hibernate. In hibernate I have entity mapped on said table. Entity contains field marked with @JdbcTypeCode(...

1 answer  ·  posted 7mo ago by talex‭  ·  last activity 7mo ago by talex‭

java json spring hibernate
71%
+3 −0
How can I interact with the target widget from a drop event

I'm trying to update a ListBox widget after dropping some files on it. This is the relevant part of my current code: fn on_file_drop(target: &DropTarget, value: &Value, ...

2 answers  ·  posted 10mo ago by GeraldS‭  ·  last activity 7mo ago by jmb‭

rust drag-and-drop gtk4-rs
77%
+5 −0
How do you implement polymorphism in C?

The topic of how to implement polymorphism in C tends to pop up now and then. Many programmers are used to OO design from higher level languages and supposedly OO is a "language-agnostic" way of pr...

1 answer  ·  posted 8mo ago by Lundin‭  ·  last activity 8mo ago by Lundin‭

c polymorphism oop inheritance
77%
+5 −0
Differences between Haskell tools Stack and Cabal?

Haskell tooling can be confusing. Both Stack and Cabal appear to be build tools with similar goals. How do they differ? Why should you pick one over the other?

1 answer  ·  posted 8mo ago by Iizuki‭  ·  edited 8mo ago by Alexei‭

tools build haskell cabal haskell-stack
66%
+2 −0
Multiple versions of scala libraries detected!

While compiling my scala project I'm getting following error. org.scala-lang.modules:scala-parser-combinators_2.13:2.4.0 requires scala version: 2.13.13 org.scalatest:scalatest_2.13:3.2.19 requ...

0 answers  ·  posted 8mo ago by talex‭

maven scala
66%
+2 −0
ffmpeg script outputs video with unexpected resolution and frame rate despite scaling and fps filtering

I'm having trouble with an ffmpeg script that's supposed to convert videos to a specific resolution and frame rate, but the output video has unexpected dimensions and frame rate. Here's my script a...

2 answers  ·  posted 8mo ago by ShadowsRanger‭  ·  last activity 8mo ago by harmony‭

bash ffmpeg
77%
+5 −0
make: How to compile all files in a directory.

I am learning how to write makefile to compile a c program. I have a directory structure like this: . ├── include │   └── library.h ├── lib │   └── library.c ├── makefile └── obj My makef...

1 answer  ·  posted 8mo ago by Vanity Slug ❤️‭  ·  last activity 8mo ago by Vanity Slug ❤️‭

c make
57%
+2 −1
How to mock methods like `pathlib.Path.is_dir`?

I used to have some testing code for mocking a simple directory structure when working with pathlib. I recently tried to run these tests to learn that some of the internals in pathlib have changed ...

1 answer  ·  posted 8mo ago by mr Tsjolder‭  ·  last activity 8mo ago by mr Tsjolder‭

python unit-testing mocking testing
66%
+2 −0
Unable to use conditional Must term in C# NEST client for Elastic Search

I'm trying to write a Elastic Search query using the C# NEST client, but right now I'm stuck on an issue with a conditional query. The query takes in two optional values, meaning they are both all...

1 answer  ·  posted 9mo ago by hest‭  ·  last activity 8mo ago by hest‭

.net
71%
+3 −0
How can I get the same "not all control paths return a value" behaviour across Clang and MSVC?

I've recently discovered that it's not actually an error to have control reach the end of a non-void function without returning anything, it's merely undefined behaviour. I want to promote the rele...

2 answers  ·  posted 9mo ago by Hyperlynx‭  ·  last activity 8mo ago by celtschk‭

c++ clang msvc
40%
+0 −1
Webpack can't recognize modules

I've got errors Uncaught TypeError: setting getter-only property "todo" and Uncaught TypeError: lib is undefined. I assume that those errors appeared when I created a new module for local sto...

0 answers  ·  posted 8mo ago by Sevenfold‭  ·  edited 8mo ago by Sevenfold‭

javascript webpack
50%
+1 −1
How to create Factory Functions instead of using Classes

Instead of classes, I want to use factory functions. Original code with classes: export class MyProject { constructor(title, description, dueDate, priority) { this.title = title; ...

0 answers  ·  posted 8mo ago by Sevenfold‭  ·  edited 8mo ago by Andreas demands justice for humanity‭

javascript design-patterns
71%
+3 −0
Unit Testing #define Directives in Visual Studio

I have some methods in my codebase that utilize the #if DEBUG preprocessor directive to provide specialized behavior that differs between the debugging environment and the production environment. I...

1 answer  ·  posted 8mo ago by Orladdin‭  ·  last activity 8mo ago by Olin Lathrop‭

c# visual-studio unit-testing
50%
+0 −0
Using sqlline, how do you filter/find tables using the !tables command

I need to filter/find and list tables using the sqlline !tables command. For example, these are the type of queries i wish to fire Find out all the tables in a particular schema s1 All tables ...

1 answer  ·  posted 8mo ago by Abbas Gadhia‭  ·  last activity 8mo ago by Abbas Gadhia‭

sqlline
72%
+6 −1
How to detach my terminal window from a program ran from it? [closed]

I want to run a program, e.g. Firefox, from terminal, but whenever I close the terminal, program closes too. How to detach my terminal window from a program ran from it?

1 answer  ·  posted 8mo ago by kujaw‭  ·  closed 8mo ago by Alexei‭

linux terminal
77%
+5 −0
Json deserialization of enum, forbid int

I have a DTO that contains an enum field: @Getter @Setter static class Foo { Bar bar; } enum Bar { X, Y } When I deserialize a JSON, it allows int as values: var objectMapper ...

2 answers  ·  posted 8mo ago by talex‭  ·  edited 8mo ago by hkotsubo‭

java json jackson
66%
+2 −0
SQL scripts referenced in persistence configuration must have each statement on its own line

I'm currently working on a Java application using Jakarta Persistence with EclipseLink and PostgreSQL. While setting up the application to test the database layer, the persistence configuration is ...

0 answers  ·  posted 8mo ago by ɯıpɐʌ‭  ·  edited 8mo ago by ɯıpɐʌ‭

java sql jpa jakarta-ee jakarta-persistence
71%
+3 −0
How to format Markdown in terminal

When printing Markdown text to the terminal, how can I get a bit more formatting so it looks nicer? I realize that this is a bit of a contradiction, since terminals generally use only one font. Bu...

1 answer  ·  posted 11mo ago by matthewsnyder‭  ·  last activity 8mo ago by Michael‭

markdown python-3 software-recommendation pretty-print terminal
66%
+2 −0
Filter stashes by pathspec

The documentation for git stash list says list [<log-options>] List the stash entries that you currently have. Each stash entry is listed with its name (e.g. stash@{0} is the latest entry...

0 answers  ·  posted 1y ago by Michael‭  ·  edited 8mo ago by Michael‭

git git-stash git-log
66%
+2 −0
VSCode go is confused about what version of Go I have installed

I'm trying to work with a Go project that I'm taking over from another developer. The go.mod file says I need at least version 1.13, and I have 1.22.3 installed according to go version. However, wh...

0 answers  ·  posted 9mo ago by Andrew Ray‭  ·  edited 9mo ago by Alexei‭

go vs-code
83%
+8 −0
Map<?, Optional<T>> to Map<?, T>

I have a Map with Optional values. I want to filter it to remove empty values. Map<K, Optional<T>> input; Map<K, T> result = input. // here is some code I'm looking for ...

2 answers  ·  posted 9mo ago by talex‭  ·  last activity 9mo ago by hkotsubo‭

java stream
71%
+3 −0
Execute SQL queries stored in a table

Let's say I have a table with SQL statements in a column. I want to execute them all. create table sql_command( sql_text text ) I know how to execute one SQL statement using EXEC, but I wa...

1 answer  ·  posted 9mo ago by talex‭  ·  edited 9mo ago by Michael‭

sql postgresql
66%
+2 −0
Why is package.json needed for running a SvelteKit application?

I'm trying to containerize a SvelteKit application that uses the @sveltejs/adapter-node. The Build and Deploy section from the documentation recommends to build the application, and then run the a...

0 answers  ·  posted 9mo ago by ɯıpɐʌ‭

node.js docker sveltekit
60%
+1 −0
Identifying non-daemon threads in an Android ANR stack dump

One of "my" Android apps is showing a heavy frequency of "slow exit" application-not-responding (ANR) problems. The Play Console has the "insight": Slow exit Problem The main thread has finish...

0 answers  ·  posted 9mo ago by Peter Taylor‭

android stacktrace
71%
+3 −0
multi-arch code fails on mingw 64bits

I have a C/++ codebase that compiles in Windows x86_64 targeting x86 using the mingw32 32-bit shell of the MSYS64 project. (It also compiles fine on linux x86/x86_64 and android's 4 archs.) Howev...

0 answers  ·  posted 9mo ago by JohnRando‭  ·  edited 9mo ago by JohnRando‭

c c++ mingw
83%
+8 −0
Why is the new auto keyword from C++11 or C23 dangerous?

In older C and C++ standards, the auto keyword simply meant automatic storage duration. As in the compiler automatically handles where the variable is stored, typically on the stack or in a registe...

2 answers  ·  posted 11mo ago by Lundin‭  ·  last activity 9mo ago by celtschk‭

c c++ storage-duration c23 c++11
71%
+3 −0
Prevent anonymously subclassing

Is it possible to somehow prohibit anonymously subclassing of a specific class? For instance, with a plain public parent class: public class Parent { } Extending this class should not be pos...

1 answer  ·  posted 10mo ago by Andreas demands justice for humanity‭  ·  last activity 9mo ago by Antares‭

java inheritance
71%
+3 −0
Turn all changes after latest origin/main into a branch

I have a git history that basically looks like this: * commit: XXX (HEAD -> main) | | * commit: YYY | | * commit: ZZZ (origin/main) | | ... Now I would like to turn everything after...

2 answers  ·  posted 9mo ago by celtschk‭  ·  last activity 9mo ago by matthewsnyder‭

git
57%
+2 −1
What actually is a pytest fixture?

Pytest uses fixtures. Their docs explain what fixtures do: https://docs.pytest.org/en/stable/explanation/fixtures.html But what actually is a fixture? Is there a definition for it? Is this a term ...

1 answer  ·  posted 9mo ago by matthewsnyder‭  ·  last activity 9mo ago by Karl Knechtel‭

terminology testing pytest
66%
+2 −0
Spring Boot application not excluding Jdbi bean when running tests using WebFluxTest

I have a simple Spring Boot 3.x reactive application that exposes a RESTful API. The application uses Jdbi in the persistence layer, and the configuration for Jdbi is straightforward: @EnableTrans...

0 answers  ·  posted 9mo ago by ɯıpɐʌ‭

java spring spring-boot jdbi
77%
+5 −0
How can I git checkout the previous HEAD?

After switching to a different branch, git checkout - can move me back to the branch I came from. This is handy for times when I wonder "wait, what was that last branch again?" But this does not w...

1 answer  ·  posted 9mo ago by matthewsnyder‭  ·  last activity 9mo ago by hkotsubo‭

git
63%
+5 −2
Is `git pull` dangerous?

I heard git pull is dangerous. Is it really dangerous? If so, why or how is it dangerous? Are there any flags that mitigate or remove the danger? What are the alternatives if it...

2 answers  ·  posted 10mo ago by alx‭  ·  last activity 10mo ago by alx‭

git
50%
+0 −0
STM32: read data in device sent by host over USB HID

In an STM32CubeIDE USB HID project for an STM32F103C8 board I can send data from the device to the host using the USBD_HID_SendReport() function, like so: USBD_HID_SendReport(&hUsbDeviceFS, (u...

0 answers  ·  posted 10mo ago by etale_cohomology‭

usb usb-hid stm32 libusb
66%
+2 −0
how can I run pytest on Flask routes?

I'm trying to implement pytest for one of my Python Flask projects. The application is instanciated like this in appname.py def create_app(): app = Flask(__name__) app.config.from_pyfil...

0 answers  ·  posted 10mo ago by GeraldS‭  ·  edited 10mo ago by GeraldS‭

python flask pytest
77%
+5 −0
Reusing HTML without rewriting it

I have a site hosted through GitHub and I'm using footers for special links and it also serves as my main navigation bar for now. I find it a little frustrating to manually copy-paste the footer's ...

3 answers  ·  posted 10mo ago by General Sebast1an‭  ·  last activity 10mo ago by matthewsnyder‭

html
71%
+3 −0
What does Nixpkgs' `callPackage` do?

callPackage is a complex function (reasons include the Nix language being lazy, usage of fixed-point evaluation, overrides, etc.), and this complexity steals the spotlight from what this function a...

1 answer  ·  posted 10mo ago by toraritte‭  ·  edited 10mo ago by toraritte‭

*nix nixpkgs