[boost] Refactoring a library for header-only or linked library?

I am considering refactoring a (potential Boost) library separating declarations and definitions into two sets of files with the objective of reducing compilation times and allow it to be used as header-only or linking with a pre-built library. Is there is best/Boost way of doing this? Is there a Boost library that I should use as a model? ASIO? Should I call the definition files .cpp or .ipp? Should definition files go in libs/src or in boost/? How should I control the header-only/library switch? View and suggestions? Thanks Paul --- Paul A. Bristow, Prizet Farmhouse, Kendal LA8 8AB UK +44 1539 561830 07714330204 pbristow@hetp.u-net.com