https://svn.boost.org/trac10/ticket/13239 <p> There is no warning 4800 for the MS compiler Compiling gives </p> <pre class="wiki">boost/type_traits/detail/has_binary_operator.hpp(40): warning C4619: #pragma warning: there is no warning number '4800' </pre><p> warning 4619 is level 3 and therefore visible in most cases </p> <p> My compiler </p> <pre class="wiki">Microsoft (R) C/C++ Optimizing Compiler Version 19.11.25508.2 for x64 </pre> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/13239 Trac 1.4.3 Kohei Takahashi Tue, 03 Oct 2017 00:50:04 GMT https://svn.boost.org/trac10/ticket/13239#comment:1 https://svn.boost.org/trac10/ticket/13239#comment:1 <ul> <li><strong>owner</strong> set to <span class="trac-author">John Maddock</span> </li> <li><strong>component</strong> <span class="trac-field-old">None</span> → <span class="trac-field-new">type_traits</span> </li> </ul> Ticket John Maddock Thu, 25 Jan 2018 11:00:17 GMT https://svn.boost.org/trac10/ticket/13239#comment:2 https://svn.boost.org/trac10/ticket/13239#comment:2 <ul> <li><strong>status</strong> <span class="trac-field-old">new</span> → <span class="trac-field-new">closed</span> </li> <li><strong>resolution</strong> → <span class="trac-field-new">fixed</span> </li> </ul> <p> yup, fixed, thanks. </p> Ticket