The whole topic of custom stream_buf versions or better yet, composable stream_buf adaptors has been under appreciated in my view. I know
"Robert Ramey" <ramey@rrsd.com> wrote in message: there was
some discussion and work done. I don't know what happened. I suspect it turned out to be "too big" to finish to boost standards in the amount of time that the developer could allocate.
Sometime last summer I posted a small library for creating custom streams and stream buffers. You suggested I extended it to incorporate filtering, which I did. It's in the formal review queue. I'm not sure it's what you had in mind, but you can take a look at the online version here: http://www.xmission.com/~turkanis/iostreams/. One type of streambuf I chose not to support, because I didn't think it would be used much, was a streambuf whose underlying sequence of characters is presented as a fixed in-memory array. (Daryle Walker provdies one in his i/o library.) The application with memory mapped files seems important enough that I think I should add such a facility, which would be easy to do. I'm trying to decide the most elegant way. Jonathan