"Larry Evans" <cppljevans@cox-internet.com> wrote in:
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
? 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:
http://www.tcpipguide.com/free/t_TCPOperationalOverviewandtheTCPFiniteStateM... This is getting pretty far afield, isn't it, Larry? ;-)
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...
Jonathan, I'll be trying to rewrite the above code with IOStreams. looks like it'll be very easy. I'll just have to add the same member variables in the above code to that in your example:
toupper_output_filter;
and rename it, of course, and change the put to check the bol flag and print the margin before outputing the character. Then add a method to adjust the margin length.
I look forward to this. Maybe I can make it one of the examples, or part of the library in the 'text-processing' category.
BTW, Jonathan, the documentation looks very good. I'll use it as a model if I ever try to get anything submitted.
Thanks! BTW, I hope you can find time to submit a review. Best Regards, Jonathan