Hi, for my redirected output boost.python (bpl) program I like to set special writing functions at construction time. The idea is to use a boost.function for this, like (my won't work): static std::auto_ptr<stdout_redirector> make_stdout_redirector(EmbeddedPython& console) { std::auto_ptr<stdout_redirector> ptr(new stdout_redirector); *ptr.m_write_fn = boost.bind(EmbeddedPython::write, &console); return ptr; } or even: static std::auto_ptr<stdout_redirector> make_stdout_redirector(EmbeddedPython& console) { std::auto_ptr<stdout_redirector> ptr(new stdout_redirector(boost.bind(EmbeddedPython::write, &console))); return ptr; } using the constructor, which would be different for that what python would see (here comes my idea using bpl::make_constructor into play). So each time my redirector is called, EmbeddedPython::write can call the underlying (not seen here, std::cout used here for simplicity) write instance. The problem: I can not make those calls from boost.python's class_ , isn't it? Any ideas for this? I don't want to use global variables. Thanks, Olaf