How to C++ project for dummies
Hello, I think you can program your Nucleo board in C++ using the System Workbench for STM32, maybe you just need to create a C++ project instead of a C project. The download link is http://www.openstm32.org/Downloading+the+System+Workbench+for+STM32+installer
I'm almost sure that you can use your own Classes and Header Files. Let me know if it works.