So URDL (https://github.com/chriskohlhoff/urdl ) is not part of boost, I know. But a nasty MSVC 2013 compiler error prevents the most simple code to compile. #define _WIN32_WINNT 0x0601 #define URDL_HEADER_ONLY 1 #define URDL_DISABLE_SSL 1 #include <urdl/istream.hpp> #include <boost/progress.hpp> #include <iostream> #include <fstream> int main(int argc, char* argv[]) { return 0; } The fix is relatively simple but it would change code is asio's handler_invoke_helpers.hpp. Basically change: using boost::asio::asio_handler_invoke; asio_handler_invoke(function, boost::asio::detail::addressof(context)); to boost::asio::asio_handler_invoke(function, boost::asio::detail::addressof(context)); I'm using VC2013. I'm using master branch of boost. Regards, Christian