Unfortunately, with the new iterator_facade implementation, filesystem/src/path_posix_windows.cpp" can not compile on Compaq Tru64 (cxx). cxx: Error: /usr/lib/cmplrs/cxx/V6.5-034/include/cxx/algorithm.cc, line 2582: no operator "<" matches these operands operand types are: const boost::detail::postfix_increment_proxy<boost::filesystem: :path::iterator> < const boost::detail::postfix_increment_proxy<boost::filesystem: :path::iterator> detected during instantiation of "bool std::lexicographical_compare(InputIterator1, InputIterator1, InputIterator2, InputIterator2) [with InputIterator1=boost::filesystem::path::iterator, InputIterator2=boost::filesystem::path::iterator]" if (*first2++ < *first1++) return false; --------------------^ cxx: Info: 1 error detected in the compilation of "XXX/src/boost/libs/filesystem/src/path_posix_windows.cpp". Do you have any idea to fix this problem?? Best regards, Synge From: David Abrahams <dave@boost-consulting.com> Date: Sun, 11 Jul 2004 23:18:07 -0400
David Abrahams <dave@boost-consulting.com> writes:
I'm getting ready to fix the issues we've discussed with postfix ++ (and by extension, --) in iterator_facade. Basically, the current implementation works for forward iterators but not for some input iterators:
{ self x = *this; ++*this; // <== here return x; }
The problem is that for many input iterators, all copies reference the same element. The marked line increments the iterator, which causes the current element of the sequence to be skipped, so
*a++
yields the /next/ element. To fix that, a++ needs to return a proxy type.
Fixed now in CVS, along with new tests. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com
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