I use std::shared_mutex in my project. And it compiles fine. But autocomplete does not find the type and declares my whole class as useless. I dont really know what you use to generate the autocompletion (ctags / libclang?) Is there a way to tell the engine to use those features or does the it not support 17 yet?

ATM I set the compiler flags via cmake

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)