er">def_overflow_handler</span>
    <span class="special">{</span>
        <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()</span> <span class="special">(</span> <span class="identifier">range_check_result</span> <span class="identifier">r</span> <span class="special">)</span> <span class="comment">// throw bad_numeric_conversion derived</span>
        <span class="special">{</span>
            <span class="keyword">if</span> <span class="special">(</span> <spa