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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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<title>Cell 物件 — Python 3.7.0 說明文件</title>
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<div class="section" id="cell-objects">
<span id="id1"></span><h1>Cell 物件<a class="headerlink" href="#cell-objects" title="本標題的永久連結">¶</a></h1>
<p>「Cell」 objects are used to implement variables referenced by multiple scopes.
For each such variable, a cell object is created to store the value; the local
variables of each stack frame that references the value contains a reference to
the cells from outer scopes which also use that variable. When the value is
accessed, the value contained in the cell is used instead of the cell object
itself. This de-referencing of the cell object requires support from the
generated byte-code; these are not automatically de-referenced when accessed.
Cell objects are not likely to be useful elsewhere.</p>
<dl class="type">
<dt id="c.PyCellObject">
<code class="descname">PyCellObject</code><a class="headerlink" href="#c.PyCellObject" title="本定義的永久連結">¶</a></dt>
<dd><p>C 結構的 cell 物件</p>
</dd></dl>
<dl class="var">
<dt id="c.PyCell_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> <code class="descname">PyCell_Type</code><a class="headerlink" href="#c.PyCell_Type" title="本定義的永久連結">¶</a></dt>
<dd><p>對應 cell 物件的物件型別。</p>
</dd></dl>
<dl class="function">
<dt id="c.PyCell_Check">
int <code class="descname">PyCell_Check</code><span class="sig-paren">(</span>ob<span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_Check" title="本定義的永久連結">¶</a></dt>
<dd><p>Return true if <em>ob</em> is a cell object; <em>ob</em> must not be <em>NULL</em>.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyCell_New">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyCell_New</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *ob</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_New" title="本定義的永久連結">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p>Create and return a new cell object containing the value <em>ob</em>. The parameter may
be <em>NULL</em>.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyCell_Get">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyCell_Get</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *cell</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_Get" title="本定義的永久連結">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p>回傳 cell 內容中的 <em>cell</em>。</p>
</dd></dl>
<dl class="function">
<dt id="c.PyCell_GET">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyCell_GET</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *cell</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_GET" title="本定義的永久連結">¶</a></dt>
<dd><em class="refcount">Return value: Borrowed reference.</em><p>Return the contents of the cell <em>cell</em>, but without checking that <em>cell</em> is
non-<em>NULL</em> and a cell object.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyCell_Set">
int <code class="descname">PyCell_Set</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *cell</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *value</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_Set" title="本定義的永久連結">¶</a></dt>
<dd><p>Set the contents of the cell object <em>cell</em> to <em>value</em>. This releases the
reference to any current content of the cell. <em>value</em> may be <em>NULL</em>. <em>cell</em>
must be non-<em>NULL</em>; if it is not a cell object, <code class="docutils literal notranslate"><span class="pre">-1</span></code> will be returned. On
success, <code class="docutils literal notranslate"><span class="pre">0</span></code> will be returned.</p>
</dd></dl>
<dl class="function">
<dt id="c.PyCell_SET">
void <code class="descname">PyCell_SET</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *cell</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *value</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCell_SET" title="本定義的永久連結">¶</a></dt>
<dd><p>Sets the value of the cell object <em>cell</em> to <em>value</em>. No reference counts are
adjusted, and no checks are made for safety; <em>cell</em> must be non-<em>NULL</em> and must
be a cell object.</p>
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