Скачать или смотреть Solving the std::filesystem::remove_all Issue in Clang+ + : A Guide to Safe Deletion

Discover a workaround for the `std::filesystem::remove_all` bug in C+ + . Learn how to implement sequential file deletions to avoid filesystem errors.
---
This video is based on the question https://stackoverflow.com/q/68204937/ asked by the user 'Lars Nielsen' ( https://stackoverflow.com/u/936269/ ) and on the answer https://stackoverflow.com/a/68580290/ provided by the user 'Lars Nielsen' ( https://stackoverflow.com/u/936269/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Potential bug in std::filesystem::remove_all with clang+ +

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding the Problem with std::filesystem::remove_all

If you’re a C+ + developer using the std::filesystem library with Clang+ + , you may have encountered an issue with the remove_all function. The primary problem arises when attempting to delete a large number of files in a directory, leading to errors indicating that the filesystem needs cleaning. This can cause undesired behavior in your program and may even require filesystem repairs.

In this guide, we will analyze the error message and discuss a solution to safely delete multiple files without running into these issues. We’ll utilize a program that writes a specified number of files and then attempts to delete them, leading to the problematic situation.

The Scenario

You stumbled upon the following error while executing your code that uses std::filesystem::remove_all:

[[See Video to Reveal this Text or Code Snippet]]

This issue arises despite the program successfully writing files to disk. After such an error occurs, you attempt to list the directory contents using ls, revealing further complications:

[[See Video to Reveal this Text or Code Snippet]]

In such cases, a full repair of the filesystem may be necessary, which is clearly an inconvenience.

Examining the Solution

The errors you are experiencing can often be tied to the underlying filesystem and may not necessarily indicate a bug in std::filesystem::remove_all. However, there is a safer approach you can take to delete files in your directory sequentially, which avoids potential filesystem issues.

The Main Changes

To resolve the issue, the change required in your original code is minimal. The critical operation is how you attempt to delete your files. Specifically, we will replace the single call to std::filesystem::remove_all with sequential deletions in a loop. Here’s the updated segment of code:

[[See Video to Reveal this Text or Code Snippet]]

Updated Code Structure

Incorporating these changes leads you to a more resilient program. Below is the revised program structure that incorporates sequential deletion:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Switching from std::filesystem::remove_all to sequential file deletions can significantly enhance the reliability of your C+ + programs. While this doesn’t solve potential issues with the filesystem itself, it offers a more controlled method of file removal that can prevent the Structure needs cleaning error.

Always be cautious when performing operations that modify your filesystem to avoid inadvertently damaging your environment.