I am getting following error while compiling my test with gcc 3.4.2 on Linux: gcc-C++-action ../../../bin/boost/libs/test/test/ifstream_line_iterator_test.test/gcc-3.4.2 /debug/ifstream_line_iterator_test.o /usr/local/gcc-3.4.2/lib/gcc/i686-pc-linux-gnu/3.4.2/../../../../include/c++ /3.4.2/bits/ios_base.h: In copy constructor `std::basic_ios<char, std::char_traits<char> >::basic_ios(const std::basic_ios<char, std::char_traits<char> >&)': /usr/local/gcc-3.4.2/lib/gcc/i686-pc-linux-gnu/3.4.2/../../../../include/c++ /3.4.2/bits/ios_base.h:738: error: `std::ios_base::ios_base(const std::ios_base&)' is private ../../../libs/test/test/ifstream_line_iterator_test.cpp:28: error: within this context /usr/local/gcc-3.4.2/lib/gcc/i686-pc-linux-gnu/3.4.2/../../../../include/c++ /3.4.2/streambuf: In copy constructor `std::basic_filebuf<char, std::char_traits<char> >::basic_filebuf(const std::basic_filebuf<char, std::char_traits<char> >&)': /usr/local/gcc-3.4.2/lib/gcc/i686-pc-linux-gnu/3.4.2/../../../../include/c++ /3.4.2/streambuf:769: error: `std::basic_streambuf<_CharT, _Traits>::basic_streambuf(const std::basic_streambuf<_CharT, _Traits>&) [with _CharT = char, _Traits = std::char_traits<char>]' is private ../../../libs/test/test/ifstream_line_iterator_test.cpp:28: error: within this context An error occured in line performing comparison: 26: ifstream_line_iterator it( "abc" ); 27: 28: BOOST_CHECK( it != ifstream_line_iterator() ); Looks like compiler end up generating copy constructor. Why did this happend? Is there workaround? Gennadiy