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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)
80%
+6 −0
Fail to send DICOM C-Echo, although DICOM Association seems successful.

I am building an Android app to perform a DICOM C-Echo. (DICOM is a standard for storing and transferring medical images; the specification is at dicom.nema.org). My purpose is to learn more about ...

0 answers  ·  posted 4y ago by FractionalRadix‭  ·  edited 4y ago by FractionalRadix‭

android dicom tcp-ip
84%
+9 −0
How to override default string formatter?

It is possible to create a new formatter class by subclassing string.Formatter class and then to use it like myformatter.format("{foo:customformat}", foo=foo). It's not super-convenient though, and...

1 answer  ·  posted 4y ago by luser‭  ·  edited 4y ago by Alexei‭

python string-formatting
66%
+2 −0
Tampermonkey userscript prevents pages from loading

I am currently making a userscript to interpret the APL programming language in a Stackexchange chat window. This is the code I have come up with: // ==UserScript== // @name APL chat // @ver...

1 answer  ·  posted 4y ago by Razetime‭  ·  last activity 4y ago by Razetime‭

javascript tampermonkey chrome
71%
+3 −0
How to manage views and stored procedures in an ASP.NET Core project?

I am slowly modernizing an older ASP.NET Core Web API and one of the steps involved migrating from database first to code first. Now, all schema changes and seeding is covered by migrations which ...

0 answers  ·  posted 4y ago by Alexei‭

asp.net-core entity-framework-core entity-framework-migrations
66%
+2 −0
Confusion about using std::async with class member function

So,I'm having a doubt when I call std:async() on a member function of a class. The book I'm reading says (emphasis mine) You can also pass a pointer to a member function to async(). In that case...

1 answer  ·  posted 4y ago by hamsasimon‭  ·  last activity 4y ago by C. K. Young‭

c++ multithreading
60%
+1 −0
Is it necessary for a build server to remove node_modules before an AOT build?

I am currently dealing with an Angular application that is being deployed using an CI orchestrator and Jenkins. Jenkins job is configured to do the following (relevant steps only): fetch source...

2 answers  ·  posted 4y ago by Alexei‭  ·  last activity 4y ago by Derek Elkins‭

angular build node-modules
42%
+1 −2
Resources for learning Julia [closed]

I have decide to try out Julia. Is anyone aware of some good resources to get started with the language?

0 answers  ·  posted 4y ago by Guilherme Costa‭  ·  closed 4y ago by Alexei‭

julia
66%
+2 −0
Keras image_dataset_from_directory - how image size works

I am using tf.keras.preprocessing.image_dataset_from_directory. According to the documentation, the related image_size parameter is the Size to resize images to after they are read from disk. How...

0 answers  ·  posted 4y ago by Guilherme Costa‭  ·  edited 4y ago by Alexei‭

keras tf.keras
81%
+7 −0
Pros and cons of various type_traits idioms

My work tasks have recently started requiring me to use the type_traits header to restrict the classes that may be used in template functions, methods, and classes. And while I used it for a long t...

1 answer  ·  posted 4y ago by dmckee‭  ·  edited 4y ago by Marc.2377‭

c++ template-metaprogramming sfinae
77%
+5 −0
When should I use wait() instead of get() when using C++ threads

I'm trying to understand the purpose of the wait() function in Class future<> for C++. At the moment I don't see any purpose for calling wait() instead of get(). What I have tried in code: i...

1 answer  ·  posted 4y ago by hamsasimon‭  ·  last activity 4y ago by Derek Elkins‭

c++ multithreading
75%
+10 −2
What are the pros and cons of a composite primary key versus a unique constraint?

Let's say we have two tables A and B and a join table C that has foreign keys to both A and B and the combination of those foreign keys is unique. One could either do a unique constraint or a comp...

2 answers  ·  posted 5y ago by Charlie Brumbaugh‭  ·  edited 4y ago by Alexei‭

sql primary-key unique-constraint
80%
+6 −0
Is it unsecure to use a password on the command line to run a MySQL script on Windows?

Its possible to execute a MySQL file from the command line like so, mysql -u USER -pPASSWORD < FILENAME which triggers a warning, mysql: [Warning] Using a password on the command line int...

2 answers  ·  posted 5y ago by Charlie Brumbaugh‭  ·  edited 4y ago by ghost-in-the-zsh‭

mysql windows
66%
+4 −1
How can I write an egrep (grep -E) regexp that matches lines containing two stanzas in arbitrary order?

I have line-based data on the form x1=y2; a3=b4; c5=d6; ... Matching this with a extended regular expression is fairly straightforward; for example, one can do something not entirely dissimilar...

3 answers  ·  posted 4y ago by Canina‭  ·  last activity 4y ago by hkotsubo‭

regex grep
66%
+4 −1
What's the difference between null pointers and NULL?

Someone told me that I shouldn't write "NULL pointer" with capital letters, because a null pointer and NULL are different terms. And that NULL is a "null pointer constant". What's the meaning of th...

3 answers  ·  posted 4y ago by Lundin‭  ·  last activity 4y ago by EJP‭

c null null-pointer null-pointer-constant
83%
+8 −0
How do I find the order that yields the shortest path?

The Problem I have a path optimization problem that in some ways reminds me of the Traveling Salesman Problem, but differs in some key respects. I have a group of items that need to be used by a m...

1 answer  ·  posted 4y ago by matthewb‭  ·  edited 4y ago by matthewb‭

algorithms
16%
+0 −8
Delete specific cells with shift cells up

Answers to Excel - Get only values from column that are not Zero “0” asked by @CiscoNewb includes ones applying AGGREGATE: =IFERROR(INDEX(A:A,AGGREGATE(15,6,ROW(A$2:A$12)/(A$2:A$12>0),ROW(A1)))...

0 answers  ·  posted 4y ago by pnuts‭  ·  edited 4y ago by luap42‭

excel delete
66%
+2 −0
What are the cons of directly mocking Entity Framework DbSets instead of working with an in-memory database when unit testing the application?

I have recently contributed to a Clean Code project and had a discussion about how to implement unit tests. The project author argues for using an in-memory database (which easily replaces the rea...

1 answer  ·  posted 4y ago by Alexei‭  ·  last activity 4y ago by Goyo‭

entity-framework-core unit-testing dbset mocking
71%
+3 −0
Union of queries depending on variable in list

I have a big Cypher query that is depending on a variable. Example: With REGION = 'Canada' query I want to execute this query several times based on different values on a list and return the UN...

1 answer  ·  posted 4y ago by Guilherme Costa‭  ·  edited 4y ago by Alexei‭

cypher neo4j union
66%
+2 −0
Search paths where all nodes are in a relationship with same node

Using the below graph as an example: I am trying to determine all Persons which are_sons of Persons all born in the same country. Is there an elegant way to achieve this with Cypher?

1 answer  ·  posted 4y ago by Guilherme Costa‭  ·  last activity 4y ago by r~~‭

cypher neo4j
66%
+2 −0
How much memory is allocated for a MySQL VARCHAR variable in a stored procedure?

In a stored procedure let's say I have a VARCHAR variable, DECLARE example_variable VARCHAR(100); how much memory is allocated to it and is that independent of the length of the data in the var...

2 answers  ·  posted 4y ago by Charlie Brumbaugh‭  ·  last activity 4y ago by Alexei‭

mysql stored-procedures
75%
+4 −0
Static and thread_local initialization order

Is there any guarantee regarding initialization of static and thread_local objects? In example, is there any guarantee about the value printed by the following program? #include<iostream> s...

1 answer  ·  posted 4y ago by Estela‭  ·  edited 4y ago by Alexei‭

c++ static thread-local
90%
+18 −0
Does the location of an import statement affect performance in Python?

When writing Python-based apps (e.g. Django, Flask, etc.), it's often the case that import statements can be found all over the place, often more than once for the same module. For example, you can...

1 answer  ·  posted 4y ago by ghost-in-the-zsh‭  ·  last activity 4y ago by ghost-in-the-zsh‭

python python-internals
66%
+2 −0
How to automatically run Entity Framework Core migrations for an application which uses a user with read/write rights on certain tables?

I have decided to convert a legacy database-first ASP.NET Core project to code-first. However, I have noticed that the project used the same database as another bigger project and the Entity Framew...

1 answer  ·  posted 4y ago by Alexei‭  ·  last activity 4y ago by Alexei‭

security entity-framework-core entity-framework-migrations
83%
+8 −0
Is MISRA-C useful outside safety-critical and embedded programming?

When discussing best or safest C programming practices with various C gurus on the Internet, the "MISRA-C guidelines for the use of C language in critical systems" often pops up as a source. This ...

1 answer  ·  posted 4y ago by Lundin‭  ·  last activity 4y ago by ghost-in-the-zsh‭

c misra-c
54%
+4 −3
How can I make --reset-author the default?

I do a lot of rebasing and amending of my topic branches. I don't think it's especially useful for me or my colleagues to see in the logs what date it was when I first started working on the partic...

3 answers  ·  posted 4y ago by Hyperlynx‭  ·  last activity 4y ago by Charlie Brumbaugh‭

git
75%
+4 −0
Unable to `mount` overlayfs in Docker container when inside a LXC with a ZFS pool

Summary/Context I'm currently working to improve performance and throughput of our automation infrastructure, most of which is a combination of Bash/Shell scripts, Python scripts, Docker, Jenkins,...

1 answer  ·  posted 4y ago by ghost-in-the-zsh‭  ·  last activity 4y ago by ghost-in-the-zsh‭

linux bash docker lxc zfs
75%
+4 −0
Is there a way to automatically fix MySQL tables where the auto_increment has fallen behind the correct value?

Due to a series of unfortunate events I have some tables where the auto_increment value got behind what it should be. If the auto_increment value is 9 and there are 20 rows in the table the next 1...

1 answer  ·  posted 4y ago by Charlie Brumbaugh‭  ·  last activity 4y ago by Alexei‭

mysql auto-increment
71%
+3 −0
In PHP what is the use case for include instead of require when including PHP scripts?

In PHP one can either use include or require to include files, the difference is that if the file doesn't exist it will emit a fatal error and halt with a require and only emit a warning with inclu...

1 answer  ·  posted 4y ago by Charlie Brumbaugh‭  ·  last activity 4y ago by Marijn‭

php
71%
+3 −0
In MySQL is there a limit to the number of keys in a IN() clause?

I have a PHP program that does a SELECT and then updates some of the values based on an algorithm. Rather than updating one row at a time UPDATE example_table SET COLUMN_A = 1 WHERE primary_k...

2 answers  ·  posted 4y ago by Charlie Brumbaugh‭  ·  last activity 4y ago by Alexei‭

mysql
71%
+3 −0
How to make Microsoft.Build.Evaluation.Project use same base properties as Visual Studio?

Microsoft.Build.Evaluation.Project seems to have some rather odd ideas of what values to use when loading projects. In particular, I have a number of projects with the following dependency: <Pa...

1 answer  ·  posted 4y ago by Peter Taylor‭  ·  last activity 4y ago by Peter Taylor‭

msbuild visual-studio
71%
+3 −0
Iterating through a MySQL table with a LIMIT clause and PHP gets progressively slower

I have a very large table that I need to iterate through with a PHP script and I can't do all of the results at once so I do it in sections with a LIMIT like for ($x = 0; $x < 10000000; $x += 1...

1 answer  ·  posted 4y ago by Charlie Brumbaugh‭  ·  last activity 4y ago by ArtOfCode‭

php mysql
66%
+2 −0
How to perform LEFT JOIN using LINQ method call notation?

I am interested in performing a LEFT JOIN using LINQ-2-SQL when working with method call notation. This answer suggests a way that relies on GroupJoin but it is more verbose than expected: var le...

1 answer  ·  posted 4y ago by Alexei‭  ·  last activity 4y ago by Alexei‭

.net linq left-join linq-to-sql
71%
+3 −0
Why would an unique index get moved to the primary key after the underlying column is dropped?

So I had a table with a primary key and a bunch of different columns. Columns A, B, and C were all unsigned ints (like the primary key column) and each column had a unique constraint I dropped the...

1 answer  ·  posted 4y ago by Charlie Brumbaugh‭  ·  edited 4y ago by Alexei‭

mysql database-index
77%
+5 −0
Is it possible in MySQL to require each row in a table have at least one foreign key record in a join table?

I have tables A and B and then I have a many to many join table with foreign keys to both called a_b. Neither foreign key can be null and the combinations for the foreign keys to A and B are unique...

2 answers  ·  posted 4y ago by Charlie Brumbaugh‭  ·  last activity 4y ago by Alexei‭

mysql referential
50%
+0 −0
Is it possible to rebuild a STL file from gcode?

I have a couple of 3d example projects in gcode for my printer but the printer bed has a couple of bumps in the center (where things are printed by default) and in order to print the objects I woul...

0 answers  ·  posted 4y ago by Charlie Brumbaugh‭  ·  edited 4y ago by Moshi‭

gcode stl-format
50%
+0 −0
How to drop all stored procedures from a MySQL database

I need to drop all of the stored procedures from my MySQL database before I recreate them. How can I do so?

1 answer  ·  posted 4y ago by Charlie Brumbaugh‭  ·  edited 4y ago by Peter Mortensen‭

mysql stored-procedures
75%
+4 −0
How can I add "withCredentials:true" for HTTP requests generated by Swagger UI?

I have added Swagger UI for an ASP.NET Core 3.1 application and I have realized that all endpoints requiring Windows Authentication fail. This issue is created by the fact that generated HTTP reque...

1 answer  ·  posted 4y ago by Alexei‭  ·  last activity 4y ago by Alexei‭

swagger swagger-ui credentials
71%
+3 −0
SID to login for access via a group

I have a query that returns the owner of jobs on an SQL instance, select s.name as JobName , s.owner_sid , ISNULL(L.name,'AccessViaGroup') as LoginName --Trying to figure out how to turn that ...

0 answers  ·  posted 4y ago by James Jenkins‭  ·  edited 4y ago by Alexei‭

sql-server login sql-server-2019
60%
+1 −0
Permutations of an array - APL

In Dyalog APL, there's a predefined function in the dfns library to generate a matrix of permutations for a list of the numbers from 1 to n. I want to create the same functionality, except that it...

1 answer  ·  posted 4y ago by Razetime‭  ·  edited 4y ago by Alexei‭

APL array permutations shuffle dyalog
60%
+1 −0
How can I can I reduce the size of a SQL Server database after being restored and massive embedded files stripped?

My project has the following set up for the production and preproduction ("clone") environment. Production is not accessible at all for the development team, only the preproduction database. Pr...

1 answer  ·  posted 4y ago by Alexei‭  ·  last activity 4y ago by Alexei‭

sql-server sql-server-2017
60%
+1 −0
How to create a delayed loading indicator when working with ngrx/store?

I am working on an Angular application using ngrx and I have a loader state + reducer that is used to display a loader. However, very short AJAX calls cause a flicker and I need to delay showing th...

1 answer  ·  posted 4y ago by Alexei‭  ·  last activity 4y ago by Alexei‭

ngrx ngrx-effects delay
50%
+1 −1
Create encrypted zip archive with bsdtar [closed]

I'm trying to create an encrypted¹ zip archive using bsdtar. Here's where I got stuck: bsdtar -c --options='zip:encryption' --passphrase "secret" -f test.zip test This is the error I get: bs...

0 answers  ·  posted 4y ago by Matthias Braun‭  ·  closed 4y ago by Lundin‭

zip bsdtar
66%
+2 −0
How can I assign the result of an operation from within a function to the global environment?

I have a function that which does some calculations. I would like to assign the result of the function to the global environment from within the function, how do I proceed? A minimal example: meanF...

2 answers  ·  posted 4y ago by Zerotime‭  ·  edited 4y ago by Alexei‭

r variable-assignment global-variables
71%
+3 −0
How do I track down intermittent locks in a MySQL database?

Currently, we have a CRUD plus reporting application that talks to one MySQL database. Intermittently users will report locks when searching, currently, I can only get the approximate time of when ...

0 answers  ·  posted 4y ago by Charlie Brumbaugh‭  ·  edited 4y ago by Alexei‭

mysql database-locking
66%
+2 −0
In MySQL, is it possible to disable triggers for only certain queries or users?

Almost every table in my DB has triggers that fire on INSERT, UPDATE, DELETE and write the changes to a separate read only DB. This makes it possible to track changes and undo things well after the...

1 answer  ·  posted 4y ago by Charlie Brumbaugh‭  ·  edited 4y ago by Alexei‭

mysql database-trigger
72%
+6 −1
Which abstraction should I choose for background services and why?

Which concept is best for managed background services? 1. RunAsync(CancellationToken): interface IWorker { Task RunAsync(CancellationToken cancellationToken = default); } ... IWorker worker =...

1 answer  ·  posted 4y ago by Kir_Antipov‭  ·  last activity 4y ago by Alexei‭

c# software-practices async-await .net
66%
+2 −0
Are hyphens and/or underscores valid in golang package names?

Can a Go package name validly contain a hyphen and/or an underscore? The godocs say that By convention, packages are given lower case, single-word names; there should be no need for underscores or...

1 answer  ·  posted 4y ago by qohelet‭  ·  last activity 4y ago by Moshi‭

naming-conventions go
40%
+0 −1
How do World Wide Web interactions happen in a general level? [closed]

I understand that any World Wide Web interaction works this way: Stage 1: Client (human or software) ⟶ User agent ⟶ HTTP/S web-server request (with an unresolved domain) Stage 2: ISP-initiated Rou...

0 answers  ·  posted 4y ago by deleted user  ·  last activity 4y ago by Alexei‭

web
81%
+7 −0
Function call; `this` gets bound to unexpected value

I recently encountered a strange situation in javascript; if I have: let obj = { a: function() { return (this === obj) ? this.b : 'bye'; }, b: 'hello' }; I can call obj.a with this bound...

2 answers  ·  posted 4y ago by Gershy‭  ·  last activity 4y ago by Alexei‭

javascript function this
77%
+12 −2
What gets allocated on the stack and the heap?

I was told by my professor/book that computer programs use two kinds of memory and that all variables get allocated either on the stack or on the heap. Is this true? How can I tell where a variable...

2 answers  ·  posted 5y ago by Lundin‭  ·  edited 4y ago by Alexei‭

stack-memory heap-memory memory-management