...I use it and think that tree OO interface targeted to C++ more fast and power than UML class diagrams.
ObjectBuilder perfectly organize C++ header files with any level of complexity. Even if you use loop-references if OO hierarchy, you need include only one project-level header file.
You can easy modify and refactore existing project with cut/copy/paste ANY object (from Method Argument to entire Project) within project and between ObjectBuilder projects.
ObjectBuilder is not an IDE tool. It is portable two-way architect code-generation tool.