Hi, I don't want to merge the new iostreams changes until the unit test results are looking better. So I had a go at fixing restrict_test and slice_test. It would be really helpful if someone more familiar with the library than I am check this. There are two changes, the first is just to fix a problem with running the tests (which I suspect is why the test failure wasn't noticed before). The second one is the one that matters. It look like that when a write to a restricted/sliced stream goes past the end of the restricted area it wasn't writing the last part of the data, so I've tried to fix that. The change is here: https://svn.boost.org/trac/boost/changeset/58225 If it's wrong, I'll revert it. I know little about the library, so I'd appreciate any help here. thanks, Daniel