an></code> feature
      is available, both macros will use it. For <code class="computeroutput"><span class="identifier">BOOST_STATIC_ASSERT</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code>,
      the error message will be a stringized version of <code class="computeroutput"><span class="identifier">x</span></code>.
      For <code class="computeroutput"><span class="identifier">BOOST_STATIC_ASSERT_MSG</span><span class="special">(</span><span class