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<section id="cell-objects">
<span id="id1"></span><h1>Cell 物件<a class="headerlink" href="#cell-objects" title="連結到這個標頭">¶</a></h1>
<p>"Cell" 物件用於實現被多個作用域所參照 (reference) 的變數。對於每個這樣的變數，都會有個 cell 物件為了儲存該值而被建立；參照該值的每個 stack frame 中的區域性變數包含外部作用域的 cell 參照，它同樣使用了該變數。存取該值時，將使用 cell 中包含的值而不是 cell 物件本身。這種對 cell 物件的去除參照 (de-reference) 需要生成的位元組碼 (byte-code) 有支援；存取時不會自動去除參照。cell 物件在其他地方可能不太有用。</p>
<dl class="c type">
<dt class="sig sig-object c" id="c.PyCellObject">
<span class="k"><span class="pre">type</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyCellObject</span></span></span><a class="headerlink" href="#c.PyCellObject" title="連結到這個定義">¶</a><br /></dt>
<dd><p>Cell 物件所用之 C 結構。</p>
</dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyCell_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyCell_Type</span></span></span><a class="headerlink" href="#c.PyCell_Type" title="連結到這個定義">¶</a><br /></dt>
<dd><p>對應 cell 物件的物件型別。</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyCell_Check">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyCell_Check</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">ob</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_Check" title="連結到這個定義">¶</a><br /></dt>
<dd><p>如果 <em>ob</em> 是一個 cell 物件則回傳真值；<em>ob</em> 必須不為 <code class="docutils literal notranslate"><span class="pre">NULL</span></code>。此函式總是會成功執行。</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyCell_New">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyCell_New</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">ob</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_New" title="連結到這個定義">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">回傳值：新的參照。</em><p>建立並回傳一個包含 <em>ob</em> 的新 cell 物件。參數可以為 <code class="docutils literal notranslate"><span class="pre">NULL</span></code>。</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyCell_Get">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyCell_Get</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">cell</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_Get" title="連結到這個定義">¶</a><br /></dt>
<dd><em class="refcount return_new_ref">回傳值：新的參照。</em><p>回傳 cell 物件 <em>cell</em> 的內容，其可能為 <code class="docutils literal notranslate"><span class="pre">NULL</span></code>。如果 <em>cell</em> 不是一個 cell 物件，則將回傳 <code class="docutils literal notranslate"><span class="pre">NULL</span></code> 並設定例外。</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyCell_GET">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyCell_GET</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">cell</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_GET" title="連結到這個定義">¶</a><br /></dt>
<dd><em class="refcount return_borrowed_ref">回傳值：借用參照。</em><p>回傳 cell 物件 <em>cell</em> 的內容，但是不檢查 <em>cell</em> 是否非 <code class="docutils literal notranslate"><span class="pre">NULL</span></code> 並且為一個 cell 物件。</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyCell_Set">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyCell_Set</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">cell</span></span>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">value</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_Set" title="連結到這個定義">¶</a><br /></dt>
<dd><p>將 cell 物件 <em>cell</em> 的內容設為 <em>value</em>。這將釋放任何對 cell 物件目前內容的參照。<em>value</em> 可以為 <code class="docutils literal notranslate"><span class="pre">NULL</span></code>。<em>cell</em> 必須不為 <code class="docutils literal notranslate"><span class="pre">NULL</span></code>。</p>
<p>在成功時回傳 <code class="docutils literal notranslate"><span class="pre">0</span></code>。如果 <em>cell</em> 不是一個 cell 物件，則將設定例外並回傳 <code class="docutils literal notranslate"><span class="pre">-1</span></code>。</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyCell_SET">
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyCell_SET</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">cell</span></span>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">value</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_SET" title="連結到這個定義">¶</a><br /></dt>
<dd><p>將 cell 物件 <em>cell</em> 的值設為 <em>value</em>。不會調整參照計數，並且不會進行任何安全檢查；<em>cell</em> 必須為非 <code class="docutils literal notranslate"><span class="pre">NULL</span></code> 並且為一個 cell 物件。</p>
</dd></dl>
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