[boost] custom iterator comparisons (gcc 3.4.2)

From: Gennadiy Rozental (gennadiy.rozental_at_[hidden])
Date: 2005-01-31 14:32:16

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