Sorry, I posted too early, I found the answer in the documentation. I was looking around forever and I couldn't find it :)

On Thu, Feb 28, 2008 at 3:53 PM, Robert Dailey <rcdailey@gmail.com> wrote:
Does the Boost.Iostreams library have overloaded bitshift operators? That way I could do:

boost::iostreams::stream<myclass> theOutputStream;
theOutputStream << MyData;