How to convert from c++ function pointer to c# delegate?

[zmoth]

SWIG : 4.2.1

Now I have a c++ header file Logger.h.

class Logger
{
  public:
    using LogMessage = void (*)(Logger::Level, const char *);
    static inline void logger_handler(LogMessage h) { Logger::instance()->_handler = h; }
}

Expect c# generate file Logger.cs

public class Logger : global::System.IDisposable {

  ...

  public delegate void LogMessage(Logger.Level level, string message);

  public static void LoggerHandler(LogMessage h) {
    csLoggerPINVOKE.Logger_LoggerHandler(h);
  }

  ...

}

I tried a lot of methods to generate delegate code without success, and I wasn't very familiar with swig and c#. Expect a simple solution. thank you.