C/C++ plugin is a good plugin for c++ in vscode.
However, if use this plugin to work with big project like linux kernel, the intelliSense progress will use a large amout of CPU and so that casue bad user experience.

set

"C_Cpp.intelliSenseEngine": "Disabled"

in settings.json can help with this problem, but this wiil also disable implementation search functionility.

To deal with it, C++ Intellisense plugin is a good choose.

C++ Intellisense plugin is another good vscode plugin for c++ developer.
To use C++ Intellisense in Ubuntu, follow these steps:

1. sudo apt install global
2. in your workspace folder run

gtags

3. install C++ Intellisense plugin
4. Now you have go to implementation(F12) for using