I'm editing in VSCode with the official C++ extension. Autocomplete is not super reliable with it, but it didn't really work for me in Xcode either. The benefit of using VSCode is that you can get syntax highlighting (and sometimes even autocomplete) for other file types widely used in the repository, like .ll, and CMakeLists.txt etc. It also feels much more responsive and less laggy to me than Xcode with large codebases.
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