Recommendations: asynchronous, portable file io in c++

I'm looking for a C++, async io library that should be compatible with both un开发者_C百科ix and windows systems.

What are some good libraries? Is this asking too much for a library that does both systems? What are peoples' experiences with this matter?

Use boost::asio with boost::iostreams instead of asio streams. ASIO provides asynchronousness, while IOStreams provide powerful portable IO options.

Try to take a look at boost::asio. I've never personally used it but I heard good things about it.