Simply including managed_mapped_file.hpp in an empty project will generate an error in boost 1.44 using VC 2010. This doesn't occur in 1.43 and is a showstopper to me. Any ideas to work around this? I created a Console App using the New Project wizard. Here's the whole program: #include "stdafx.h" #include int _tmain(int argc, _TCHAR* argv[]) { return 0; } The following output log is generated: 1>------ Build started: Project: boost144Err, Configuration: Debug Win32 ------ 1> boost144Err.cpp 1>c:\lib\boost_1_44_0\boost\interprocess\detail\move.hpp(342): error C2440: 'return' : cannot convert from 'boost::interprocess::mapped_region' to 'boost::interprocess::mapped_region &&' 1> You cannot bind an lvalue to an rvalue reference 1> c:\lib\boost_1_44_0\boost\interprocess\mapped_region.hpp(159) : see reference to function template instantiation 'boost::interprocess::mapped_region &&boost::interprocess::moveboost::interprocess::mapped_region&(T)' being compiled 1> with 1> [ 1> T=boost::interprocess::mapped_region & 1> ] 1>c:\lib\boost_1_44_0\boost\interprocess\detail\move.hpp(342): error C2440: 'return' : cannot convert from 'boost::interprocess::detail::file_wrapper' to 'boost::interprocess::detail::file_wrapper &&' 1> You cannot bind an lvalue to an rvalue reference 1> c:\lib\boost_1_44_0\boost\interprocess\detail\file_wrapper.hpp(63) : see reference to function template instantiation 'boost::interprocess::detail::file_wrapper &&boost::interprocess::moveboost::interprocess::detail::file_wrapper&(T)' being compiled 1> with 1> [ 1> T=boost::interprocess::detail::file_wrapper & 1> ] 1>c:\lib\boost_1_44_0\boost\interprocess\detail\move.hpp(342): error C2440: 'return' : cannot convert from 'boost::interprocess::file_mapping' to 'boost::interprocess::file_mapping &&' 1> You cannot bind an lvalue to an rvalue reference 1> c:\lib\boost_1_44_0\boost\interprocess\file_mapping.hpp(62) : see reference to function template instantiation 'boost::interprocess::file_mapping &&boost::interprocess::moveboost::interprocess::file_mapping&(T)' being compiled 1> with 1> [ 1> T=boost::interprocess::file_mapping & 1> ] ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========