[C++-sig] calling python logger module from C++

[Eric]

I've been wondering how best to provide support for calling my python logger
(which uses the standard logger module) from within my C++ extensions built
using Boost.Python. My first thought was to do this:

enum LogLevel {
  LogLevelCritical = 50,
    LogLevelError = 40,
    LogLevelWarning = 30,
    LogLevelInfo = 20,
    LogLevelDebug = 10
};


class PiLogger {
public:

  virtual void Log( LogLevel level, std::wstring msg ) = 0;

};

and then implement this class in python, setting it as a static variable in
my C++. This works pretty well, but I'd like to be able to support format
strings, which requires varargs. I couldn't figure out how to wrap a varargs
function - is that even possible? If it's not, is there a better way to
accomplish what I want?

Thanks,

Eric