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<section id="allocating-objects-on-the-heap">
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<span id="allocating-objects"></span><h1>Allocating Objects on the Heap<a class="headerlink" href="#allocating-objects-on-the-heap" title="Link to this heading">¶</a></h1>
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<dl class="c function">
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<dt class="sig sig-object c" id="c._PyObject_New">
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<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">_PyObject_New</span></span></span><span class="sig-paren">(</span><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="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c._PyObject_New" title="Link to this definition">¶</a><br /></dt>
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<dd><em class="refcount return_new_ref">Return value: New reference.</em></dd></dl>
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|
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<dl class="c function">
|
||
<dt class="sig sig-object c" id="c._PyObject_NewVar">
|
||
<a class="reference internal" href="structures.html#c.PyVarObject" title="PyVarObject"><span class="n"><span class="pre">PyVarObject</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">_PyObject_NewVar</span></span></span><span class="sig-paren">(</span><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="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">size</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c._PyObject_NewVar" title="Link to this definition">¶</a><br /></dt>
|
||
<dd><em class="refcount return_new_ref">Return value: New reference.</em></dd></dl>
|
||
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.PyObject_Init">
|
||
<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">PyObject_Init</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">op</span></span>, <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="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyObject_Init" title="Link to this definition">¶</a><br /></dt>
|
||
<dd><em class="refcount return_borrowed_ref">Return value: Borrowed reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>Initialize a newly allocated object <em>op</em> with its type and initial
|
||
reference. Returns the initialized object. Other fields of the object are
|
||
not affected.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.PyObject_InitVar">
|
||
<a class="reference internal" href="structures.html#c.PyVarObject" title="PyVarObject"><span class="n"><span class="pre">PyVarObject</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">PyObject_InitVar</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyVarObject" title="PyVarObject"><span class="n"><span class="pre">PyVarObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">op</span></span>, <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="p"><span class="pre">*</span></span><span class="n"><span class="pre">type</span></span>, <a class="reference internal" href="intro.html#c.Py_ssize_t" title="Py_ssize_t"><span class="n"><span class="pre">Py_ssize_t</span></span></a><span class="w"> </span><span class="n"><span class="pre">size</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyObject_InitVar" title="Link to this definition">¶</a><br /></dt>
|
||
<dd><em class="refcount return_borrowed_ref">Return value: Borrowed reference.</em><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a>.</em><p>This does everything <a class="reference internal" href="#c.PyObject_Init" title="PyObject_Init"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyObject_Init()</span></code></a> does, and also initializes the
|
||
length information for a variable-size object.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="c macro">
|
||
<dt class="sig sig-object c" id="c.PyObject_New">
|
||
<span class="sig-name descname"><span class="n"><span class="pre">PyObject_New</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">TYPE</span></span>, <span class="n"><span class="pre">typeobj</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyObject_New" title="Link to this definition">¶</a><br /></dt>
|
||
<dd><p>Allocate a new Python object using the C structure type <em>TYPE</em>
|
||
and the Python type object <em>typeobj</em> (<code class="docutils literal notranslate"><span class="pre">PyTypeObject*</span></code>).
|
||
Fields not defined by the Python object header are not initialized.
|
||
The caller will own the only reference to the object
|
||
(i.e. its reference count will be one).
|
||
The size of the memory allocation is determined from the
|
||
<a class="reference internal" href="typeobj.html#c.PyTypeObject.tp_basicsize" title="PyTypeObject.tp_basicsize"><code class="xref c c-member docutils literal notranslate"><span class="pre">tp_basicsize</span></code></a> field of the type object.</p>
|
||
<p>Note that this function is unsuitable if <em>typeobj</em> has
|
||
<a class="reference internal" href="typeobj.html#c.Py_TPFLAGS_HAVE_GC" title="Py_TPFLAGS_HAVE_GC"><code class="xref c c-macro docutils literal notranslate"><span class="pre">Py_TPFLAGS_HAVE_GC</span></code></a> set. For such objects,
|
||
use <a class="reference internal" href="gcsupport.html#c.PyObject_GC_New" title="PyObject_GC_New"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyObject_GC_New()</span></code></a> instead.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="c macro">
|
||
<dt class="sig sig-object c" id="c.PyObject_NewVar">
|
||
<span class="sig-name descname"><span class="n"><span class="pre">PyObject_NewVar</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">TYPE</span></span>, <span class="n"><span class="pre">typeobj</span></span>, <span class="n"><span class="pre">size</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyObject_NewVar" title="Link to this definition">¶</a><br /></dt>
|
||
<dd><p>Allocate a new Python object using the C structure type <em>TYPE</em> and the
|
||
Python type object <em>typeobj</em> (<code class="docutils literal notranslate"><span class="pre">PyTypeObject*</span></code>).
|
||
Fields not defined by the Python object header
|
||
are not initialized. The allocated memory allows for the <em>TYPE</em> structure
|
||
plus <em>size</em> (<code class="docutils literal notranslate"><span class="pre">Py_ssize_t</span></code>) fields of the size
|
||
given by the <a class="reference internal" href="typeobj.html#c.PyTypeObject.tp_itemsize" title="PyTypeObject.tp_itemsize"><code class="xref c c-member docutils literal notranslate"><span class="pre">tp_itemsize</span></code></a> field of
|
||
<em>typeobj</em>. This is useful for implementing objects like tuples, which are
|
||
able to determine their size at construction time. Embedding the array of
|
||
fields into the same allocation decreases the number of allocations,
|
||
improving the memory management efficiency.</p>
|
||
<p>Note that this function is unsuitable if <em>typeobj</em> has
|
||
<a class="reference internal" href="typeobj.html#c.Py_TPFLAGS_HAVE_GC" title="Py_TPFLAGS_HAVE_GC"><code class="xref c c-macro docutils literal notranslate"><span class="pre">Py_TPFLAGS_HAVE_GC</span></code></a> set. For such objects,
|
||
use <a class="reference internal" href="gcsupport.html#c.PyObject_GC_NewVar" title="PyObject_GC_NewVar"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyObject_GC_NewVar()</span></code></a> instead.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.PyObject_Del">
|
||
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyObject_Del</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">op</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyObject_Del" title="Link to this definition">¶</a><br /></dt>
|
||
<dd><p>Releases memory allocated to an object using <a class="reference internal" href="#c.PyObject_New" title="PyObject_New"><code class="xref c c-macro docutils literal notranslate"><span class="pre">PyObject_New</span></code></a> or
|
||
<a class="reference internal" href="#c.PyObject_NewVar" title="PyObject_NewVar"><code class="xref c c-macro docutils literal notranslate"><span class="pre">PyObject_NewVar</span></code></a>. This is normally called from the
|
||
<a class="reference internal" href="typeobj.html#c.PyTypeObject.tp_dealloc" title="PyTypeObject.tp_dealloc"><code class="xref c c-member docutils literal notranslate"><span class="pre">tp_dealloc</span></code></a> handler specified in the object’s type. The fields of
|
||
the object should not be accessed after this call as the memory is no
|
||
longer a valid Python object.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="c var">
|
||
<dt class="sig sig-object c" id="c._Py_NoneStruct">
|
||
<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="sig-name descname"><span class="n"><span class="pre">_Py_NoneStruct</span></span></span><a class="headerlink" href="#c._Py_NoneStruct" title="Link to this definition">¶</a><br /></dt>
|
||
<dd><p>Object which is visible in Python as <code class="docutils literal notranslate"><span class="pre">None</span></code>. This should only be accessed
|
||
using the <a class="reference internal" href="none.html#c.Py_None" title="Py_None"><code class="xref c c-macro docutils literal notranslate"><span class="pre">Py_None</span></code></a> macro, which evaluates to a pointer to this
|
||
object.</p>
|
||
</dd></dl>
|
||
|
||
<div class="admonition seealso">
|
||
<p class="admonition-title">See also</p>
|
||
<dl class="simple">
|
||
<dt><a class="reference internal" href="module.html#c.PyModule_Create" title="PyModule_Create"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyModule_Create()</span></code></a></dt><dd><p>To allocate and create extension modules.</p>
|
||
</dd>
|
||
</dl>
|
||
</div>
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||
</section>
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