unsure | simple esolang , based on things people | Chat library

I want to do a simple calculation for each row by group, but I need to refer to a previous row that meets certain conditions. I want to create a new variable, results. For each row in each group, I want to find the closest row above where tag == "Y" and code is not NA. Then, I want to use the value from that row, and multiply by the value in the current row.

Minimal Example

I am trying to access a nested record using lenses and prisms in Haskell:

I'm using python-docx to create a document with a table I want to populate from textual data. My text looks like this:

Ever since I've upgraded my Mac to Monteray, I've been having issues with Vagrant.

Initially, I use to see a vBoxManage error on terminal when running vagrant up. I posted a question on this on SO previously, see here for details.

Today, I uninstalled VirtualBox again (removed VirtualBox VMs folder and moved application to trash) and reinstalled VirtualBox 6.1.3 for OS X hosts` (link here).

I then ran vagrant up on terminal and it successfully compiled:

After seeing the famous green teddy, I tried going to vvv.test but, the page doesn't load. I've tried accessing URLs of sites that have been provisioned before, but they too do not load.

I've also ran vagrant up --debug, and nothing concerning was seen.

My Vagrant version is 2.2.19

Unsure what steps to take next?

Edit:

Steps taken:

1. Have ran vagrant up --provision to provision sites in config.yml file (config.yml file can be seen below)
2. Have tried to access website-dev.test, page doesn't load
3. Have tried to access vvv.test, page doesn't load
4. Have ran vagrant reload --provision and repeated steps 2 and 3, but same results
5. Have ran vagrant halt and vagrant up and repeated steps 2 and 3, but same results

I don't believe there's an issue in my config.yml file, as before Monteray update, everything was working fine (and I've made no changes to my yml file since). But, to cover all scenario's, here is my config.yml file:

I have a networking layer that currently uses completion handlers to deliver a result on the operation is complete.

As I support a number of iOS versions, I instead extend the network layer within the app to provide support for Combine. I'd like to extend this to now also a support Async/Await but I am struggling to understand how I can achieve this in a way that allows me to cancel requests.

The basic implementation looks like;

I am trying to get to grips with the specifics of the (C++20) standards requirements for container classes with a view to writing some container classes that are compatible with the standard library. To begin looking into this matter I have looked up the references for named requirements, specifically around container requirements, and have only found one general container requirement called Container given by the standard. Reading this requirement has given my two queries that I am unsure about and would like some clarification on:

1. The requirement for the expression a == b for two container type C has as precondition on the element type T that it is equality comparable. However, noted later on the same page under the header 'other requirements' is the explicitly requirement that T be always equality comparable. Thus, on my reading the precondition for the aforementioned requirement is redundant and need not be given. Am I correct in this thinking, or is there something else at play here that I should take into account?

2. I was surprised to see explicit requirements on T at all: notably the equality comparable requirement above and the named requirement destructible. Does this mean it is undefined behaviour to ever construct standard containers of types failing these requirements, or only to perform certain standard library function calls on them?

Apologies if these two questions sound asinine, I am currently trying to transition my C++ knowledge from a place of having a basic understanding of how to use features to a robust understanding so that I may write good generic code. Whilst I am trying to use (a draft of) the standard to look up behaviour where possible, its verbiage is oft too verbose for me to completely understand what is actually being said.

In an attempt to seek the answer I cooked up a a quick test .cpp file to try an compile, given below. All uncommented code compiles with MSVC compiler set to C++20. All commented code will not compile, and visa versa all uncommented code will. It seems that what one naively thinks should work does In particular:

• We cannot construct any object without a destructor, though the objects type is valid and can be used for other things (for example as a template parameter!)
• We cannot create an object of vector, where T has no destructor, even if we don't attempt to create any objects T. Presumably because creating the destructor for vector tries to access a destructor for T.
• We can create an object of type vector, T where T has no operator ==, so long as we do not try to use operator ==, which would require T to have operator ==.

However, just because my compiler lets me make an object of vector where T is not equality-comparable does not mean I have achieved standards compliant behaviour/ all of our behaviour is not undefined - which is what I want I concerned about, especially as at least some of the usual requirements on the container object have been violated.

Code:

I have two slightly different types of lists that I need to sort; however, I only need to sort portions of the list while keeping some elements in place (i.e., their index should stay the same).

First, let's say that I have a list of numbers:

(Solution has been found, please avoid reading on.)

I am creating a pixel art editor for Android, and as for all pixel art editors, a paint bucket (fill tool) is a must need.

To do this, I did some research on flood fill algorithms online.

I stumbled across the following video which explained how to implement an iterative flood fill algorithm in your code. The code used in the video was JavaScript, but I was easily able to convert the code from the video to Kotlin:

https://www.youtube.com/watch?v=5Bochyn8MMI&t=72s&ab_channel=crayoncode

Here is an excerpt of the JavaScript code from the video:

Converted code:

I am trying to make sure my Jenkins instance is not exploitable with the latest log4j exploit.

I have a pipeline script that runs, I tried following this instruction :

https://community.jenkins.io/t/apache-log4j-2-vulnerability-cve-2021-44228/990

This is one of my stages of my pipeline script: