[Boost-users] boost.log library - backend sink

Hi, How can I create a backend sink that does the following: 1. set a backend sink to log into a file named: sample.log 2. once the log file exceeded a maximum limit of 10MB, the backend renames the filename to sample.old, and resumes logging into a new sample.log. the rotation settings as described in the documentation of boost.log don't suit my requirements, so how can I do what I mentioned above? Thanks