https://svn.boost.org/trac10/ticket/9538 <p> In proto/proto_fwd.hpp, based on how the macro BOOST_PROTO_USE_NORMAL_RESULT_OF is used, it's meant to be defined when the compiler supports c++11 decltype and implements N3276, for example, BOOST_PROTO_RESULT_OF is boost::result_of when BOOST_PROTO_USE_NORMAL_RESULT_OF is defined. </p> <p> However, its definition seems incorrect, and is inconsistent with the comments next to it. </p> <pre class="wiki"> #ifdef BOOST_NO_CXX11_DECLTYPE_N3276 ^^^^^^ this should be #ifndef # // Proto can only use the decltype-based result_of if N3276 has been # // implemented by the compiler. # // See http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2011/n3276.pdf # ifndef BOOST_PROTO_USE_NORMAL_RESULT_OF # define BOOST_PROTO_USE_NORMAL_RESULT_OF # endif #endif </pre> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/9538 Trac 1.4.3