Hello, With all the recent discussion about result_of and now that decltype has started to trickle into compilers, I thought it might be a good time for Boost to provide a result_of along the lines of the typeof-based implementation described in N1454. I've attached a patch to Ticket #862, which does this. http://svn.boost.org/trac/boost/ticket/862 This is an old bug report that apparently got a little mangled during the SVN migration, but I think result_of/lambda compatibility is a familiar problem. My patch fixes the problem of using result_of with lambda on compilers that support decltype. It does not preclude fixes to the problem on C++03 platforms, such as Shunsuke Sogame's Egg and Marco Costalba's multi-signature function, for example. It also makes boost::result_of more compliant with the current C++0x std::result_of described in N2588. My patch differs from N2588 in that std::result_of only supports function call expressions of the form f(x). I read this as precluding support for member function pointers, which are invoked with expressions of the form o->*f(x). My patch reuses the pointer specialization from the current implementation, so that boost::result_of can continue support both. It also may differ from N2588 in terms of the lvalue/rvalue specifications. I'm not sure that I understand this correctly, and I would be grateful if someone would look over it to see if my implementation should be changed for better conformance. The patch also includes updates to the documentation and tests. I tested with msvc 9, gcc 3.4, and gcc 4.3. Thanks for your consideration! Daniel Walker