Why not just have separate synchronous and asynchronous APIs?
That would have been good choice, but for some reason, the SLP designers thought their way would be better. OpenSLP API is just an implementation of a standardized specification described in RFC 2614. Furthermore, a non-callback version may be implemented in terms of the callback version. This allows programmers to add value without duplicating effort. If you want such a wrapper library, please feel free to write one, and add it to the OpenSLP project – that way everyone can benefit!
