https://svn.boost.org/trac10/ticket/6909 <p> To make <code>result_of</code> and <code>tr1_result_of</code> equivalent, we have to add specialization of <code>tr1_result_of</code>. (Boost.Functional/Forward already has specialization of <code>result_of</code>.) </p> <p> Also, it would be nice to avoid specialization of <code>result_of</code>, when we use decltype-based <code>result_of</code>. (As for <code>tr1_result_of</code>, it should be specialized even when decltype-based <code>result_of</code> is used.) </p> <p> So, instead of </p> <pre class="wiki">template &lt;...&gt; struct result_of&lt;F()&gt; { typedef XXXX type; }; </pre><p> we should write </p> <pre class="wiki">#if !defined(BOOST_RESULT_OF_USE_DECLTYPE) || defined(BOOST_NO_DECLTYPE) template &lt;...&gt; struct result_of&lt;F()&gt; { typedef XXXX type; }; #endif template &lt;...&gt; struct tr1_result_of&lt;F()&gt; { typedef XXXX type; }; </pre><p> A quick grep said the following files specialize <code>result_of</code>. </p> <ul><li>functional/forward_adapter.hpp </li><li>functional/lightweight_forward_adapter.hpp </li></ul> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/6909 Trac 1.4.3