Hello! I'm trying to write some content to a new file using boost::stream<file_sink> class. Unfortunately errors/failures during opening the file are ignored by boost library. Here is a snippet: using namespace boost::iostreams; stream<file_sink> stream( "/wrong.txt" ); std::cout << stream.fail() << ' ' << stream.bad() << std::endl; stream.exceptions( std::ios::badbit | std::ios::failbit ); stream << "test" << std::endl; stream.close(); Program is started as not root user and have not access for file / wrong.txt. It should throw an exception, but instead of this: - console prints: 0 0 - none exception is thrown - file /wrong.txt is not created Similar piece of code using std::ofstream works as I expect: using namespace std; ofstream stream( "/wrong.txt" ); std::cout << stream.fail() << ' ' << stream.bad() << std::endl; stream.exceptions( std::ios::badbit | std::ios::failbit ); stream << "test" << std::endl; stream.close(); - console prints: 1 0 - exception is thrown I cannot believe that boost::iostreams has such obvious bug and just ignore failures! I have to do something wrong. But what? Regards, Mariusz Wojtysiak