Hello, i'm a new user to these great boost libraries... I think i found a bug in (version 1.33.1) the current code starting line 80 is template std::streamsize copy_impl( Source& src, Sink& snk, std::streamsize buffer_size, mpl::false_, mpl::true_ ) { // Copy from an indirect Source to a direct Sink. using namespace std; typedef typename char_type_of<Source>::type char_type; typedef pair pair_type; detail::basic_buffer buf(buffer_size); pair_type p = snk.output_sequence(); streamsize total = 0; bool done = false; while (!done) { streamsize amt; done = (amt = iostreams::read(src, buf.data(), buffer_size)) == -1; std::copy(buf.data(), buf.data() + amt, p.first + total); if (amt != -1) total += amt; } return total; } I think it should be somthing like template std::streamsize copy_impl( Source& src, Sink& snk, std::streamsize buffer_size, mpl::false_, mpl::true_ ) { // Copy from an indirect Source to a direct Sink. using namespace std; typedef typename char_type_of<Source>::type char_type; typedef pair pair_type; detail::basic_buffer buf(buffer_size); pair_type p = snk.output_sequence(); streamsize total = 0; streamsize amt = 0; //bool done = false; while ((amt = iostreams::read(src, buf.data(),buffer_size))!= -1) { std::copy(buf.data(), buf.data() + amt, p.first + total); total += amt; } return total; } The current code happens to crash whereas the proposed version works properly... Did I miss something or a I right ? Regards, Mathieu -- http://matioupi.free.fr/