%.3g" would contain the value
      of <code class="computeroutput"><span class="identifier">val</span></code> to 3 digits. See the
      <a href="../../../../format/index.html" target="_top">Boost.Format</a> documentation
      for more details.
    </p>
<h4>
<a name="math_toolkit.error_handling.h11"></a>
      <span class="phrase"><a name="math_toolkit.error_handling.checked_narrowing_cast"></a></span><a class="link" href="error_handling.html#math_toolkit.error_handling.checked_narrowing_cast">Errors
    