The following code gives me a compiler error on Visual Studio 2010 with both Boost 1.48 and 1.49beta1: #include <string> #include #include #include class Incomplete; typedef boost::interprocess::allocator, boost::interprocess::managed_shared_memory::segment_manager> Allocator; typedef boost::interprocess::mapstd::string, Allocator1> IncompleteMap; class Incomplete { IncompleteMap blah; }; This code compiles fine if I instead use std::allocator. As best as I can tell from the compiler message, at some point in the instantiation of map, boost::container::container_detail::version<T> is instantiated with T=boost::interprocess::allocator< boost::container::container_detail::rbtree_node< std::pairstd::string,Incomplete, boost::interprocess::offset_ptr<void> >, boost::interprocess::segment_manager< char, boost::interprocess::rbtree_best_fit< boost::interprocess::mutex_family >, boost::interprocess::iset_index >

Which results in boost::container::container_detail::is_convertable being instantiated with T=boost::container::container_detail::version_type< boost::interprocess::allocator<...>, // Same as above 0

U=boost::container::container_detail::version_type< boost::interprocess::allocator<...>, 2

Somehow (I'm quite fuzzy on this), this results in boost::container::container_detail::rbtree_node being instantiated with T=std::pairstd::string,Incomplete. This then results in the pair being instantiated, which has a member of type Incomplete... BOOM! If I replace container_detail::is_convertible in extract_version with boost::is_convertible from Boost.TypeTraits (or with std::is_convertible, for that matter), the code above successfully compiles. Is this a valid temporary workaround, or will it lead to other complications? Thank you, Erik Jensen