>
<span class="keyword">void</span> <span class="identifier">safe_f</span><span class="special">(</span>
    <span class="keyword">const</span> <span class="identifier">safe</span><span class="special">&lt;</span><span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">&gt;</span> <span class="special">&amp;</span> <span class="identifier">x</span><span class="special">,</span>
    <span class="keyword">const</span> <span class="identifier">safe</span><span class="special"