="identifier">x</span><span class="special">,</span>
      <span class="identifier">msg</span><span class="special">)</span></code>,
      the error message will be the <code class="computeroutput"><span class="identifier">msg</span></code>
      string.
    </p>
<p>
      If the C++0x <code class="computeroutput"><span class="keyword">static_assert</span></code> feature
      is not available, <code class="computeroutput"><span class="identifier">BOOST_STATIC_ASSERT_MSG</span><span class="special">(</span>