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Include implementation experience.

This commit is contained in:
Martin v. Löwis 2007-05-13 14:23:03 +00:00
parent cef6e8f06a
commit 51a225ee53
1 changed files with 15 additions and 5 deletions
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20
pep-3123.txt
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@ -106,11 +106,13 @@ As a convention, the base field SHOULD be called ob_base. However, all
accesses to ob_refcnt and ob_type MUST cast the object pointer to accesses to ob_refcnt and ob_type MUST cast the object pointer to
PyObject* (unless the pointer is already known to have that type), and PyObject* (unless the pointer is already known to have that type), and
SHOULD use the respective accessor macros. To simplify access to SHOULD use the respective accessor macros. To simplify access to
ob_type, a macro:: ob_type, ob_refcnt, and ob_size, macros::
#define Py_Type(o) (((PyObject*)o)->ob_type) #define Py_Type(o) (((PyObject*)(o))->ob_type)
#define Py_Refcnt(o) (((PyObject*)(o))->ob_refcnt)
#define Py_Size(o) (((PyVarObject*)(o))->ob_size)
is added. E.g. the code blocks:: are added. E.g. the code blocks::
#define PyList_CheckExact(op) ((op)->ob_type == &PyList_Type) #define PyList_CheckExact(op) ((op)->ob_type == &PyList_Type)
@ -121,13 +123,21 @@ needs to be changed to::
#define PyList_CheckExact(op) (Py_Type(op) == &PyList_Type) #define PyList_CheckExact(op) (Py_Type(op) == &PyList_Type)
return Py_Type(func)->tp_name; return Py_Type(func)->tp_name;
For initialization of type objects, the current sequence::
PyObject_HEAD_INIT(NULL)
0, /* ob_size */
becomes incorrect, and must be replaced with
PyVarObject_HEAD_INIT(NULL, 0)
Compatibility with Python 2.6 Compatibility with Python 2.6
============================= =============================
To support modules that compile with both Python 2.6 and Python 3.0, To support modules that compile with both Python 2.6 and Python 3.0,
the Py_Type macro is added to Python 2.6. The macros Py_INCREF the Py_* macros is added to Python 2.6. The macros Py_INCREF
and Py_DECREF will be changed to cast their argument to PyObject\*, and Py_DECREF will be changed to cast their argument to PyObject\*,
so that module authors can also explicitly declare the ob_base so that module authors can also explicitly declare the ob_base
field in modules designed for Python 2.6. field in modules designed for Python 2.6.