pan class="special">&gt;&gt;</span> <span class="identifier">x</span> <span class="special">&gt;&gt;</span> <span class="identifier">y</span><span class="special">;</span> <span class="comment">// read varibles, maybe throw exception</span>
    <span class="special">}</span>
    <span class="keyword">catch</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">exception</span> <span class="special">&am