Hello, Anyone has an idea why this code crashes: // snippet on #include <list> #include <string> #include <iostream> #include struct null_deleter { void operator()(void const *) const {} }; int main() { std::liststd::ostream > l; boost::shared_ptrstd::ostream p(&std::cout, null_deleter()); *p << "on the shared pointer" << std::endl; l.push_back(p); std::liststd::ostream >::iterator it = l.begin(); std::cout << "before loop" << std::endl; while (it++ != l.end()) { boost::shared_ptrstd::ostream p2 = *it; *p2 << "test" << std::endl; // crash here } return 0; } // snippet off // output on on the shared pointer before loop segmentation fault // output off It crashes on: std::ostream::sentry::sentry () from /usr/lib/libstdc++.so.6 Thanks.