I'm trying to figure out which standalone Asio library versions correspond to the Boost library versions for: 1.35.0 1.36.0 1.37.0 1.38.0 Is it possible to discover this from the header files? Is there some other way? I'm adding Asio-based classes to an existing library. I think I want to try and implement them using the version that was in Boost 1.35.0, but I would like to give library users the option to use the Boost Asio or the corresponding stand-alone Asio. I expect some users would appreciate that. That's why I need to know what standalone Asio version to get. - Rush