backtrace | OO-ing caller for Ruby

Hey, I am working on putting up a rocket rest api with a mongodb database.

I have been able to create a successful connection to the MongoDB Atlas and put the resulting client into the state management of rocket via the manage builder function like this:

Edit: It looks like this is a known issue with the "cascade" method. Results that return NA values after the first attempt don't like being converted to doubles when subsequent methods return lat/lons.

Data: I have a list of addresses that I need to geocode. I'm using lapply() to split-apply-combine, which works, but very slowly. My thought to split (further)-apply-combine is returning errors about dim names and sizes that are confusing to me.

I would like to read a GRIB file downloaded from server using ecCodes library in Rust. However, my current solution results in segmentation fault. The extracted example, replicating the problem, is below.

I download the file using reqwest crate and get the response as Bytes¹ using bytes(). To read the file with ecCodes I need to create a codes_handle using codes_grib_handle_new_from_file()², which as argument requires *FILE usually get from fopen(). However, I would like to skip IO operations. So I figured I could use libc::fmemopen() to get *FILE from Bytes. But when I pass the *mut FILE from fmemopen() to codes_grib_handle_new_from_file() segmentation fault occurs.

I suspect the issue is when I get from Bytes a *mut c_void required by fmemopen(). I figured I can do this like that:

I want to call filter(df, col_name == value) such as filter(mpg, hwy == 27), but

I am trying to determine if a field exists in a log file and if so, use the value of that field as part of the index name. If the field does not exist, use a different index name.

**I use Flutter Downloader Package After complete download some file , my app closes automatically and disconnecte to the android studio. Any one help me to find soltutions.

I am using neon to create a Rust addon to an Electron app. It's basically working, but every time there's a crash I get an error message like "attempt to divide by zero" but no location, and as the code base grows it gets increasingly onerous to figure out where the problem is.

I tried changing the build script from

In one of his great video, Jon Gjengset implements a mutex to notably understand the effect of std::sync::atomic::Ordering. The code is very simple : create a mutex that holds an integer and start many threads to add 1 to the integer concurrently and see the results. The code is here (I reproduce stricly Jon example) : https://github.com/fmassot/atomics-rust

When using correct ordering, we expect the program to make additions atomically and check the result as the sum of all added values. The code does several times on each thread the following actions :

• call compare_exchange_weak with Ordering::Acquire to get the lock
• on success increment the value by one
• release the lock with Ordering::Release

Unfortunately it does not seem to work on linux/x86_64 nor on macbook/arm64.

The results when running cargo r --release are sometimes correct, sometimes wrong like this:

I am trying to learn Common Lisp with the book Common Lisp: A gentle introduction to Symbolic Computation. In addition, I am using SBCL, Emacs, and Slime.

By the end of chapter 10, the author discuss the useful break function. In order to provide a background context, he presents this problematic function: