You can open a C/C++ declaration editor from a diagram editor to make modifications to the source code of C/C++ classes and data types.
A C/C++ source code editor opens in which you can edit the source code of a C/C++ declaration header file.
Parent topic: Navigating to C/C++ source code from diagrams
Related concepts
Class diagrams
Related tasks
Opening C/C++ source code from class diagram editor
Navigating from diagrams to source code files of C/C++ elements