On Tue, Aug 31, 2004 at 06:41:36PM -0500, Larry Evans wrote:
I haven't thought deeply about this, but could this message idea and stack of streambuf's be used to implement a part of the upper layers of the OSI model:
http://www.geocities.com/SiliconValley/Monitor/3131/ne/osimodel.html
Well, the idea coming from my work on libcw ... one description of libcw is "An Object Oriented C++ library for networking applications", so yes - the whole idea has always been to be a general though efficient method to deal with networking protocols (the top layer of OSI).
? For example, each layer would correspond to an element in the stack of streambufs, and each streambuf could have a state associated with it. For example, the state could be a complex fsm, as with TCP:
You lost me here. stack elements of streambufs are not related to OSI layers (which even include the hardware?! A horse != cow). Also, I talked about 'messages' (chunks of data) and not about stacked streambufs; mulitple streambufs means copying of data and I am trying to talk Jonathan out of that :p. Finally, a TCP statemachine is an ISO layer lower - and a statemachine that would decode a specific protocol would be a layer higher then my 'Message' objects.
http://www.tcpipguide.com/free/t_TCPOperationalOverviewandtheTCPFiniteStateM...
In another application, indenting output to reflect code structure, the state could be a simple flag, bol (beginning-of-line), to indicate the next character output will be the first on the line, and a length, to indicate the width of the current margin. An example of a streambuf with such a simple state is:
http://cvs.sourceforge.net/viewcvs.py/boost-sandbox/boost-sandbox/boost/io/f...
There is no streambuf on that page. -- Carlo Wood <carlo@alinoe.com>