Hi, I'm getting compile errors trying to use iterator_to() on an unordered_set when given a const reference (and returning a const_iterator). It works fine for me with ordered set. I am able to reproduce this error by adding the following two lines: MyClass const &cr = values[0]; base_set.iterator_to(cr); to the bottom of the Example code (just before the return 0 from main) for unordered_set at: http://www.boost.org/doc/libs/1_45_0/doc/html/intrusive/unordered_set_unorde... The error is: /opt/boost/include/boost-1_38/boost/intrusive/hashtable.hpp: In member function ‘boost::intrusive::detail::hashtable_iterator boost::intrusive::hashtable_impl<Config>::iterator_to(typename std::iterator_traits

::type::const_pointer>::reference) const [with Config = boost::intrusive::detail::usetopt, safe_link, boost::intrusive::default_tag, 4>, boost::hash<MyClass>, std::equal_to<MyClass>, long unsigned int, boost::intrusive::detail::bucket_traits_impl ::type>, 3ul>]’:

/opt/boost/include/boost-1_38/boost/intrusive/unordered_set.hpp:733: instantiated from ‘typename boost::intrusive::hashtable_impl<Config>::const_iterator boost::intrusive::unordered_set_impl<Config>::iterator_to(typename boost::intrusive::hashtable_impl<Config>::const_reference) const [with Config = boost::intrusive::detail::usetopt, safe_link, boost::intrusive::default_tag, 4>, boost::hash<MyClass>, std::equal_to<MyClass>, long unsigned int, boost::intrusive::detail::bucket_traits_impl

::type>, 3ul>]’

::type>, 3ul> >,

example.cpp:82: instantiated from here /opt/boost/include/boost-1_38/boost/intrusive/hashtable.hpp:1682: error: no matching function for call to ‘boost::intrusive::detail::hashtable_iterator, safe_link, boost::intrusive::default_tag, 4>, boost::hash<MyClass>, std::equal_to<MyClass>, long unsigned int, boost::intrusive::detail::bucket_traits_impl true>::hashtable_iterator(boost::intrusive::slist_iterator, normal_link>, long unsigned int, false, false, false> >, true>, const boost::intrusive::hashtable_impl, safe_link, boost::intrusive::default_tag, 4>, boost::hash<MyClass>, std::equal_to<MyClass>, long unsigned int, boost::intrusive::detail::bucket_traits_impl

::type>, 3ul> >* const)’

I am using 1_38_0. I have not yet tried 1_45_0, but I have gone through the entire list of fixed bugs on the release notes between 1_38 and 1_45. I'll try 1_45_0 in the next few days, just in case. I am able to work around my issue by casting away const on my reference before calling iterator_to and assigning the result back into a const_iterator, so for me it is nothing more than an annoyance, but I thought I'd bring it to your attention so it can be fixed in a future release. Thanks, Paul Rose