IntelliCode support for C++ previously shipped as an extension, but it is now an in-box component that installs with the “Desktop Development with C++” workload in Visual Studio 2019 16.1 Preview 2. Make sure that IntelliCode is active for C++ by enabling the “C++ base model” under Tools > Options > IntelliCode > General: 
This version of C++ IntelliCode also supports free-functions and has better accuracy. You can see the IntelliCode results starred at the top of the member list:
Talk to Us!
We’d love for you to download Visual Studio 2019 version 16.1 Preview 2 and enable IntelliCode for C++. We can be reached via the comments below or via email (visualcpp@microsoft.com). If you encounter other problems with Visual Studio or have other suggestions you can use the Report a Problem tool in Visual Studio or head over to the Visual Studio Developer Community. You can also find us on Twitter (@VisualC).
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