author | Shane McErlean <shane.mcerlean@accenture.com> |
Fri, 27 Aug 2010 15:33:49 +0100 | |
changeset 101 | 1e82a8be084a |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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.. highlightlang:: c |
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.. _allocating-objects: |
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Allocating Objects on the Heap |
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.. cfunction:: PyObject* _PyObject_New(PyTypeObject *type) |
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.. cfunction:: PyVarObject* _PyObject_NewVar(PyTypeObject *type, Py_ssize_t size) |
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.. cfunction:: void _PyObject_Del(PyObject *op) |
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.. cfunction:: PyObject* PyObject_Init(PyObject *op, PyTypeObject *type) |
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Initialize a newly-allocated object *op* with its type and initial reference. |
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Returns the initialized object. If *type* indicates that the object |
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participates in the cyclic garbage detector, it is added to the detector's set |
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of observed objects. Other fields of the object are not affected. |
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.. cfunction:: PyVarObject* PyObject_InitVar(PyVarObject *op, PyTypeObject *type, Py_ssize_t size) |
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This does everything :cfunc:`PyObject_Init` does, and also initializes the |
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length information for a variable-size object. |
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.. cfunction:: TYPE* PyObject_New(TYPE, PyTypeObject *type) |
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Allocate a new Python object using the C structure type *TYPE* and the Python |
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type object *type*. Fields not defined by the Python object header are not |
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initialized; the object's reference count will be one. The size of the memory |
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allocation is determined from the :attr:`tp_basicsize` field of the type object. |
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.. cfunction:: TYPE* PyObject_NewVar(TYPE, PyTypeObject *type, Py_ssize_t size) |
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Allocate a new Python object using the C structure type *TYPE* and the Python |
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type object *type*. Fields not defined by the Python object header are not |
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initialized. The allocated memory allows for the *TYPE* structure plus *size* |
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fields of the size given by the :attr:`tp_itemsize` field of *type*. This is |
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useful for implementing objects like tuples, which are able to determine their |
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size at construction time. Embedding the array of fields into the same |
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allocation decreases the number of allocations, improving the memory management |
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efficiency. |
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.. cfunction:: void PyObject_Del(PyObject *op) |
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Releases memory allocated to an object using :cfunc:`PyObject_New` or |
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:cfunc:`PyObject_NewVar`. This is normally called from the :attr:`tp_dealloc` |
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handler specified in the object's type. The fields of the object should not be |
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accessed after this call as the memory is no longer a valid Python object. |
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.. cfunction:: PyObject* Py_InitModule(char *name, PyMethodDef *methods) |
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Create a new module object based on a name and table of functions, returning the |
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new module object. |
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.. versionchanged:: 2.3 |
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Older versions of Python did not support *NULL* as the value for the *methods* |
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argument. |
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.. cfunction:: PyObject* Py_InitModule3(char *name, PyMethodDef *methods, char *doc) |
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Create a new module object based on a name and table of functions, returning the |
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new module object. If *doc* is non-*NULL*, it will be used to define the |
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docstring for the module. |
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.. versionchanged:: 2.3 |
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Older versions of Python did not support *NULL* as the value for the *methods* |
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argument. |
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.. cfunction:: PyObject* Py_InitModule4(char *name, PyMethodDef *methods, char *doc, PyObject *self, int apiver) |
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Create a new module object based on a name and table of functions, returning the |
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new module object. If *doc* is non-*NULL*, it will be used to define the |
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docstring for the module. If *self* is non-*NULL*, it will passed to the |
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functions of the module as their (otherwise *NULL*) first parameter. (This was |
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added as an experimental feature, and there are no known uses in the current |
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version of Python.) For *apiver*, the only value which should be passed is |
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defined by the constant :const:`PYTHON_API_VERSION`. |
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.. note:: |
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Most uses of this function should probably be using the :cfunc:`Py_InitModule3` |
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instead; only use this if you are sure you need it. |
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.. versionchanged:: 2.3 |
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Older versions of Python did not support *NULL* as the value for the *methods* |
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argument. |
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.. cvar:: PyObject _Py_NoneStruct |
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Object which is visible in Python as ``None``. This should only be accessed |
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using the ``Py_None`` macro, which evaluates to a pointer to this object. |