[capi-sig] Subtyping builtins in C

[Ken Hughes]

The work-around for a similar problem with tp_new is described here:

http://docs.python.org/ext/dnt-basics.html

"On some platforms or compilers, we can't statically initialize a 
structure member with a function defined in another C module, so, 
instead, we'll assign the tp_new slot in the module initialization 
function just before calling  PyType_Ready()"

So in BPyFloatType_Init(), you put the initialization for 
"BPyFloat_Type.tp_base = &PyFloat_Type;"

Ken

Campbell Barton wrote:
> Hi, this compiles fine on linux but on windows with MSVC8 it gives an 
> error on this line.
>
> 	&PyFloat_Type,		/* tp_base */
> saying that it cant initialize because &PyFloat_Type is not a constant.
>
> Has anyone else had this problem or know a workaround?
>
> Heres teh pytype,
> source file is here
> http://projects.blender.org/plugins/scmsvn/viewcvs.php/branches/pyapi_devel/source/blender/python/api2_2x/bpy_float.c?root=bf-blender&view=markup
> http://projects.blender.org/plugins/scmsvn/viewcvs.php/branches/pyapi_devel/source/blender/python/api2_2x/bpy_float.h?root=bf-blender&view=markup
>
> PyTypeObject BPyFloat_Type = {
> 	PyObject_HEAD_INIT(NULL)
> 	0,
> 	"BPyFloat",
> 	sizeof(BPyFloatObject),
> 	0,
> 	(destructor)BPyFloat_dealloc,	/* tp_dealloc */
> 	0,					/* tp_print */
> 	0,					/* tp_getattr */
> 	0,					/* tp_setattr */
> 	0,					/* tp_compare */
> 	0,					/* tp_repr */
> 	0,					/* tp_as_number */
> 	0,					/* tp_as_sequence */
> 	0,					/* tp_as_mapping */
> 	0,					/* tp_hash */
> 	0,					/* tp_call */
> 	0,					/* tp_str */
> 	0,					/* tp_getattro */
> 	0,					/* tp_setattro */
> 	0,					/* tp_as_buffer */
> 	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
> 	0,					/* tp_doc */
> 	0,					/* tp_traverse */
> 	0,					/* tp_clear */
> 	0,					/* tp_richcompare */
> 	0,					/* tp_weaklistoffset */
> 	0,					/* tp_iter */
> 	0,					/* tp_iternext */
> 	BPyFloat_methods,	/* tp_methods */
> 	0,					/* tp_members */
> 	BPyFloat_getset,	/* tp_getset */
> 	&PyFloat_Type,		/* tp_base */
> 	0,					/* tp_dict */
> 	0,					/* tp_descr_get */
> 	0,					/* tp_descr_set */
> 	0,					/* tp_dictoffset */
> 	(initproc)BPyFloat_init, /* tp_init */
> 	0,					/* tp_alloc */
> 	0,					/* tp_new */
> };
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