The magic.cpp file contains the implementation of the Magic class, which is intended to exemplify the utilization of a C++ class in C. To utilize objects instantiated from the Magic class in C, an additional class, MagicWrapper, is required. This is intended to adapt Magic to be invoked safely from C code through MagicWrapper. In fact, MagicWrapper handles C++'s own peculiarities, such as smart pointers, by showing them to C code as normal pointers.

The MagicWrapper class cannot yet be used directly in C code. What is needed is a C++ <-> C interface, so that C code can invoke plain C functions that internally interface with objects instantiated by the MagicWrapper (which in turn handle instances of Magic).

To this end, the magic_interface.cpp file encapsulates the C++-to-C adaptation logic. In a C file, it is only necessary to include the corresponding header file (e.g., magic_interface.h). The mainc.c file demonstrates the use of the interface functions defined in magic_interface.h.

For further information and details, please refer to the appropriately commented code in all key steps.