Just curious: is Visual Studio support not included because not deemed important? Or not supported by this particular lib? Or not supported by Travis CI for some reason? (licensing?)

As others have mentioned, Travis CI provides only Ubuntu 12.04 x64 instances and none other. Interestingly, you /could/ actually package up MSVC and run it under wine, but Travis CI's free service limits test runs to 20 mins and getting wine et al installed in that time is probably more trouble than it's worth. Besides, I have another very good reason not to: my primary development platform is Visual Studio. Why? It has the least C++11 support, but also the best debugger. Any C++11 feature supported by the Nov 2012 CTP experimental MSVC is easily supported in GCC or clang, whereas the converse is most certainly not true. A further factor is that the library is an async file i/o abstraction layer intended for Boost, and the only true async backend currently is Windows IOCP. Therefore, naturally development, and especially performance tuning, currently focuses there. Travis CI is really useful though for checking Visual Studio work: MSVC I am told does not use an AST internally, and therefore permits C++ no other compiler will allow. Very often I write template metaprogramming which MSVC is absolutely fine with but chokes either GCC or clang or both. Travis CI emails me to tell me when I've done that. This is very, very useful. Niall --- Opinions expressed here are my own and do not necessarily represent those of BlackBerry Inc.