From: Matt Brooks <mattbrooks@...>
Date: 2009-10-03T01:55:44+09:00
Subject: Rolling String Buffer needed

I have constant ascii data streaming in, each message terminated with
\n, currently I look for something specific and throw away the other
stuff and then look for something specific and throw away the other
stuff...etc

What I need now is a way to keep everything received exactly as is, in a
rolling string buffer.  So say the last 100 messages (a message to me is
a whole string terminated with \n) which could be available at any time
in a string variable, maybe called: last_100_messages

And when I append another variable length message/line to this string
buffer that ends with a \n, I want the oldest message to go
away(specifically go into a text file), so ALL messages are available in
a text file for later.




Problem is the append << method, puts the new lines on the end of the
string, I want the end of the string to always be the oldest message
that is about to be placed into a txt file that has all messages at some
point.

So in short, a rolling buffer that holds a specific amount of \n
terminated messages(100 strings terminated with \n's), not a specific
amount of data/bytes.  Where the front of the string holds the most
recent addition to the rolling buffer, and where the end of the string
holds the message that is about to be added to a file.




Also if easier, an array where each element is one message would work as
well, where array[0] is the most recent message.

I have been looking at strio, but not sure how to use it in this manner.


Thanks a lot for your input,
Matt
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