symbian-qemu-0.9.1-12/python-2.6.1/Doc/c-api/int.rst
author bugtracker-ml@nttdocomo.com
Tue, 06 Apr 2010 17:00:22 +0100
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parent 1 2fb8b9db1c86
permissions -rw-r--r--
Merge BUG 1296
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.. highlightlang:: c
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.. _intobjects:
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Plain Integer Objects
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---------------------
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.. index:: object: integer
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.. ctype:: PyIntObject
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   This subtype of :ctype:`PyObject` represents a Python integer object.
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.. cvar:: PyTypeObject PyInt_Type
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   .. index:: single: IntType (in modules types)
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   This instance of :ctype:`PyTypeObject` represents the Python plain integer type.
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   This is the same object as ``int`` and ``types.IntType``.
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.. cfunction:: int PyInt_Check(PyObject *o)
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   Return true if *o* is of type :cdata:`PyInt_Type` or a subtype of
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   :cdata:`PyInt_Type`.
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   .. versionchanged:: 2.2
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      Allowed subtypes to be accepted.
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.. cfunction:: int PyInt_CheckExact(PyObject *o)
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   Return true if *o* is of type :cdata:`PyInt_Type`, but not a subtype of
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   :cdata:`PyInt_Type`.
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   .. versionadded:: 2.2
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.. cfunction:: PyObject* PyInt_FromString(char *str, char **pend, int base)
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   Return a new :ctype:`PyIntObject` or :ctype:`PyLongObject` based on the string
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   value in *str*, which is interpreted according to the radix in *base*.  If
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   *pend* is non-*NULL*, ``*pend`` will point to the first character in *str* which
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   follows the representation of the number.  If *base* is ``0``, the radix will be
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   determined based on the leading characters of *str*: if *str* starts with
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   ``'0x'`` or ``'0X'``, radix 16 will be used; if *str* starts with ``'0'``, radix
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   8 will be used; otherwise radix 10 will be used.  If *base* is not ``0``, it
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   must be between ``2`` and ``36``, inclusive.  Leading spaces are ignored.  If
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   there are no digits, :exc:`ValueError` will be raised.  If the string represents
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   a number too large to be contained within the machine's :ctype:`long int` type
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   and overflow warnings are being suppressed, a :ctype:`PyLongObject` will be
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   returned.  If overflow warnings are not being suppressed, *NULL* will be
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   returned in this case.
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.. cfunction:: PyObject* PyInt_FromLong(long ival)
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   Create a new integer object with a value of *ival*.
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   The current implementation keeps an array of integer objects for all integers
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   between ``-5`` and ``256``, when you create an int in that range you actually
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   just get back a reference to the existing object. So it should be possible to
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   change the value of ``1``.  I suspect the behaviour of Python in this case is
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   undefined. :-)
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.. cfunction:: PyObject* PyInt_FromSsize_t(Py_ssize_t ival)
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   Create a new integer object with a value of *ival*. If the value exceeds
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   ``LONG_MAX``, a long integer object is returned.
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   .. versionadded:: 2.5
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.. cfunction:: long PyInt_AsLong(PyObject *io)
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   Will first attempt to cast the object to a :ctype:`PyIntObject`, if it is not
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   already one, and then return its value. If there is an error, ``-1`` is
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   returned, and the caller should check ``PyErr_Occurred()`` to find out whether
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   there was an error, or whether the value just happened to be -1.
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.. cfunction:: long PyInt_AS_LONG(PyObject *io)
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   Return the value of the object *io*.  No error checking is performed.
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.. cfunction:: unsigned long PyInt_AsUnsignedLongMask(PyObject *io)
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   Will first attempt to cast the object to a :ctype:`PyIntObject` or
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   :ctype:`PyLongObject`, if it is not already one, and then return its value as
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   unsigned long.  This function does not check for overflow.
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   .. versionadded:: 2.3
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.. cfunction:: unsigned PY_LONG_LONG PyInt_AsUnsignedLongLongMask(PyObject *io)
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   Will first attempt to cast the object to a :ctype:`PyIntObject` or
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   :ctype:`PyLongObject`, if it is not already one, and then return its value as
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   unsigned long long, without checking for overflow.
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   .. versionadded:: 2.3
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.. cfunction:: Py_ssize_t PyInt_AsSsize_t(PyObject *io)
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   Will first attempt to cast the object to a :ctype:`PyIntObject` or
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   :ctype:`PyLongObject`, if it is not already one, and then return its value as
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   :ctype:`Py_ssize_t`.
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   .. versionadded:: 2.5
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.. cfunction:: long PyInt_GetMax()
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   .. index:: single: LONG_MAX
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   Return the system's idea of the largest integer it can handle
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   (:const:`LONG_MAX`, as defined in the system header files).
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.. cfunction:: int PyInt_ClearFreeList(void)
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   Clear the integer free list. Return the number of items that could not
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   be freed.
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   .. versionadded:: 2.6