 else outside
        the range of the result type, then returns the result of <a class="link" href="../error_handling.html#math_toolkit.error_handling.rounding_error">rounding_error</a>:
        by default this throws an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">rounding_error</span></code>.
      </p>
</div>
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