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<a href="#" onmousedown="showPopup(this, 'popup00099');"><img src="seealsolink.png" border="0" alt="" title=""></a> SystemVerilog 3.1a语言参考手册</div>
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4.15.2 数组排序方法</div>
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数组排序方法可以对一维数组或队列的元素重新排序。 </p>
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数组排序方法的基本原型如下： </p><div class="Element170">
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<div class="Element13"><div class="Element12" id="code00178"><pre class="Element12"><span style="color: #0000FF">function void</span> ordering_method <span style="color: #800080">(</span>array_type iterator <span style="color: #800080">=</span> item<span style="color: #800080">)</span></pre></div></div>
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SystemVerilog支持下列的排序方法：</p>
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<li class="Element600"><span style="color: #0000FF">reverse</span><span style="color: #800080">()</span>反转数组（压缩的以及非压缩的）中的所有元素。指定一个<span style="color: #0000FF">with</span>子句会引起一个编译器错误。</li>
<li class="Element600"><span style="color: #0000FF">sort</span><span style="color: #800080">()</span>以升序排列非压缩数组，可选地在<span style="color: #0000FF">with</span>子句中使用表达式。当为数组元素类型定义了关系操作符的时候，<span style="color: #0000FF">with</span>子句（以及它的表达式）是可选的。</li>
<li class="Element600"><span style="color: #0000FF">rsort</span><span style="color: #800080">()</span>以降序排列非压缩数组， 可选地在<span style="color: #0000FF">with</span>子句中使用表达式。当为数组元素类型定义了关系操作符的时候，<span style="color: #0000FF">with</span>子句（以及它的表达式）是可选的。</li>
<li class="Element600"><span style="color: #0000FF">shuffle</span><span style="color: #800080">()</span>将数组中元素的顺序随机化。指定一个<span style="color: #0000FF">with</span>子句会引起一个编译器错误。</li>
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例子： </p><div class="Element170">
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<div class="Element13"><div class="Element12" id="code00179"><pre class="Element12"><span style="color: #0000FF">string</span> s<span style="color: #800080">[] = {</span><span style="color: #575D94">"hello"</span><span style="color: #800080">,</span> <span style="color: #575D94">"sad"</span><span style="color: #800080">,</span> <span style="color: #575D94">"world"</span><span style="color: #800080">};</span>
s<span style="color: #800080">.</span><span style="color: #0000FF">reverse</span><span style="color: #800080">;</span> <span style="color: #008000">// s变为{"world", "sad", "hello"};</span>
<span style="color: #0000FF">logic</span> <span style="color: #800080">[</span><span style="color: #FF0000">4</span><span style="color: #800080">:</span><span style="color: #FF0000">1</span><span style="color: #800080">]</span> b <span style="color: #800080">=</span> <span style="color: #FF0000">4</span><span style="color: #800080">'</span><span style="color: #0000FF">b</span><span style="color: #FF0000">XZ01</span><span style="color: #800080">;</span>
b<span style="color: #800080">.</span><span style="color: #0000FF">reverse</span><span style="color: #800080">;</span> <span style="color: #008000">// b变为4'b10ZX</span>
<span style="color: #0000FF">int</span> q<span style="color: #800080">[</span><span style="color: #FF0000">$</span><span style="color: #800080">] = {</span><span style="color: #FF0000">4</span><span style="color: #800080">,</span> <span style="color: #FF0000">5</span><span style="color: #800080">,</span> <span style="color: #FF0000">3</span><span style="color: #800080">,</span> <span style="color: #FF0000">1</span><span style="color: #800080">};</span>
q<span style="color: #800080">.</span><span style="color: #0000FF">sort</span><span style="color: #800080">;</span> <span style="color: #008000">// q变为{1, 3, 4, 5}</span>
<span style="color: #0000FF">struct</span> <span style="color: #800080">{</span><span style="color: #0000FF">byte</span> red<span style="color: #800080">,</span> green<span style="color: #800080">,</span> blue<span style="color: #800080">}</span> c <span style="color: #800080">[</span><span style="color: #FF0000">512</span><span style="color: #800080">];</span>
c<span style="color: #800080">.</span><span style="color: #0000FF">sort</span> <span style="color: #0000FF">with</span><span style="color: #800080">(</span><span style="color: #0000FF">item</span><span style="color: #800080">.</span>red<span style="color: #800080">);</span> <span style="color: #008000">// 仅使用red域对c排序</span>
c<span style="color: #800080">.</span><span style="color: #0000FF">sort</span><span style="color: #800080">(</span>x<span style="color: #800080">)</span> <span style="color: #0000FF">with</span> <span style="color: #800080">(</span>x<span style="color: #800080">.</span>blue<span style="color: #800080"><<</span><span style="color: #FF0000">8</span><span style="color: #800080">+</span>x<span style="color: #800080">.</span>green<span style="color: #800080">);</span> <span style="color: #008000">// 以blue接着green的顺序排序</span></pre></div></div>
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