Callback writer
***************

*CallbackWriter* class instance passes the contents of the compiled
MIB files to a user object.

class pysmi.writer.callback.CallbackWriter(cbFun, cbCtx=None)

   Invokes user-specified callable and passes transformed MIB module
   to it.

   Note: user callable object signature must be as follows

   cbFun(mibname, contents, cbCtx)

   Creates an instance of *CallbackWriter* class.

   Parameters:
      **cbFun** (*callable*) -- user-supplied callable

   Keyword Arguments:
      **cbCtx** -- user-supplied object passed intact to user callback
