Hi Christine,
Most if not all features in the Navigation Toolbox should support code generation, with the exception of some visualization functions like timescope. To check whether a specific feature supports codegen, look for the Extended Capabilities section on the corresponding documentation page.
To generate C++ code rather than C, please refer to the C++ Code Generation documentation, which instructs you on the settings you'll need to change when using the Coder products.
Hope this helps!
Cameron