I've been thinking about a better solution. I need to call a lot of C-functions that use return value and errno for error reporting. Writing a lot of code around each call is a bit clumsy so I tried to create a guard macro instead that puts all relevant data into an exception if the "C function" returned an error.
If you're to make it a library, it's better to generalize for other APIs. E.g. use GetLastError() instead of errno for Windows API.
Good input! I'm only developing in linux and mac os and lack knowledge about windows API:s. I'll experiment a bit more and evaluate how useful it is.
Excuse me if I'm wrong again, but why use boost::bind? Why (FUNC)(__VA_ARGS__) won't work?
It does work. I no longer need to use bind. The code has evolved a bit from my first attempts and this was remains from the first version. /Martin