The non-virtual filter functions act as a pass-through (i.e. no change) filter/monitor at the moment. We would need to figure out the points of customizing before adding the virtual filter functions. For instance, "doing_imbue" could have a virtual "do_postonly_imbue" that only lets the filter do its own adjusting for locale changes after the main stream buffer has already done its adjustments. The "doing_sync" method could have a virtual "do_preonly_sync" that is called before the main stream buffer's syncing, and the virtual method could return a Boolean determining if the main buffer should continue. The other "doings" could have pre- and post-actions (no "only," of course).
One difficulty would be if the reading and/or writing overrides need to store extra characters. Maybe I could add reserve space in the filtering stream buffer....
Daryle
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