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It looks like the typeof operator is likely to be accepted into the next C standard, and I was looking to see if there was a way to leverage this to create a macro using portable ISO-C that can get the length of an array passed into it or fail to compile if a pointer is passed into it. Normally generic selection can be used to force a compiler error when using an unwanted type by leaving it out of the generic association list, but in this case, we need a default association to deal with arrays of any length, so instead I am trying to force a compiler error for the generic association for the type we don't want. Here's an example of what the macro could look like:

I have a dataframe that identifies a set of values with an id:

I'd like to provide a view for a customer data structure, with it's own iterator. I wrote a small program to test it out, shown below. It I uncomment begin(), then it works. But if I use DummyIter, then I get a compile error.

In my full program, I've implemented a full iterator but for simplicity, I narrowed it down to the necessary functions here.

I made the following 25 network graphs (all of these graphs are copies for simplicity - in reality, they will all be different):

I have created different bins for each column and grouped the DataFrame based on these.

Premise: Suppose you have a table containing words, where some may be distinct and some "may overlap", meaning a longer word starts with a shorter one, eg:

I'm trying to display a table which displays some grouped data.

The header should stick (at the top of the viewport), and also some table rows that contain the group titles.

For simplicity, I've created the following example on Codepen: https://codepen.io/andreivictor/pen/RwZRZav

The code I've tried is:

I have had a document browser app up since iOS 11 (using UIKit/UIDocumentBrowserViewController). The app (let's call it "MyApp") used to create a "MyApp" folder in iCloud Drive (and/or on the device, depending on the choice made in Settings), where documents would be saved automatically.

After updating my device to iOS 15 and recompiling, without any changes to the code, the app seems not to recognize its own folder in iCloud Drive anymore. Every time a file is opened/imported from outside the app (Files, Mail, etc.), the app creates a new "MyApp" folder in iCloud Drive and saves the document there. The existing folder is renamed "MyApp 2" (and then "MyApp 3", "MyApp 4" etc. if I try to import another document).

This seems to happen only in iCloud Drive. If I choose in Settings to save documents on my device, all documents are automatically imported into the "My App" folder, as it was the case in iOS 14 and earlier.

I also tried to create a test app from scratch using the Xcode 13 UIKit document-based app template, and the behavior seems to be exactly the same... so it looks like a bug in UIDocumentBrowserViewController was introduced with the iOS update.

Did anyone notice the same? Is there a solution/workaround? Should a bug report be filed?

Thank you for your help.

[EDIT] If anybody is interested, this is the simplest way to reproduce the issue using the Xcode template:

• Create a new project in Xcode 13.0
• Choose iOS -> Document App
• Choose Interface: Storyboard and create the project (for simplicity let’s use “MyApp” as Product Name)
• Build and install MyApp on a device running iOS 15.0 or 15.0.1 with iCloud Drive enabled
• Leave the default setting for Document Storage (i.e. iCloud Drive) in Settings -> MyApp
• Create a text file with any content and save it with extension “exampletext” (i.e. the imported type identifier used by the app template - let’s call the file “test.exampletext”)
• Send an email to an inbox accessible from the device with test.exampletext as attachment
• Open Mail on the device, long-press on test.exampletext and share it to MyApp
• If a folder “MyApp” exists in iCloud Drive, it will be renamed to “MyApp 2”; a new “MyApp” folder will be created and test.exampletext will be saved in the new folder
• Sharing again test.exampletext from the mail to MyApp will create another “MyApp” folder and rename the previous one; an arbitrary number of “MyApp n” folders can be created in this way, each including one copy of the document

When I search the internet for react-native optimizations / best practices (Especially for FlatLists which are often greedy), I always find the advice not to use the arrow functions ... }.

Example 1 : https://reactnative.dev/docs/optimizing-flatlist-configuration#avoid-anonymous-function-on-renderitem :

Move out the renderItem function to the outside of render function, so it won't recreate itself each time render function called. (...)

Example 2 : https://blog.codemagic.io/improve-react-native-app-performance/ :

Avoid Arrow Functions : Arrow functions are a common culprit for wasteful re-renders. Don’t use arrow functions as callbacks in your functions to render views (...)

Example 3 : https://medium.com/wix-engineering/dealing-with-performance-issues-in-react-native-b181d0012cfa :

Arrow functions is another usual suspect for wasteful re-renders. Don’t use arrow functions as callbacks (such as click/tap) in your render functions (...)

I understand that it is recommended not to use arrow function (especially in onPress button and FlatList), and to put the components outside of the render if possible.

Good practice example :