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Reference Guide
TTupleOfInstances.cxx
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1 // Author: Wim Lavrijsen, Dec 2006
2 
3 // Bindings
4 #include "PyROOT.h"
5 #include "TTupleOfInstances.h"
6 #include "RootWrapper.h"
7 
8 
9 namespace PyROOT {
10 
11 //= support for C-style arrays of objects ====================================
13  Cppyy::TCppObject_t address, Cppyy::TCppType_t klass, Py_ssize_t nelems )
14 {
15 // TODO: the extra copy is inefficient, but it appears that the only way to
16 // initialize a subclass of a tuple is through a sequence
17  PyObject* tup = PyTuple_New( nelems );
18  for ( int i = 0; i < nelems; ++i ) {
19  // TODO: there's an assumption here that there is no padding, which is bound
20  // to be incorrect in certain cases
21  PyTuple_SetItem( tup, i,
22  BindCppObject( (char*)address + i*Cppyy::SizeOf( klass ), klass, kFALSE /* isRef */ ) );
23  // Note: objects are bound as pointers, yet since the pointer value stays in
24  // place, updates propagate just as if they were bound by-reference
25  }
26 
27  PyObject* args = PyTuple_New( 1 );
28  Py_INCREF( tup ); PyTuple_SET_ITEM( args, 0, tup );
29  PyObject* arr = PyTuple_Type.tp_new( &TTupleOfInstances_Type, args, NULL );
30  if ( PyErr_Occurred() ) PyErr_Print();
31 
32  Py_DECREF( args );
33  // tup ref eaten by SET_ITEM on args
34 
35  return arr;
36 }
37 
38 //= PyROOT custom tuple-like array type ======================================
39 PyTypeObject TTupleOfInstances_Type = {
40  PyVarObject_HEAD_INIT( &PyType_Type, 0 )
41  (char*)"ROOT.InstancesArray", // tp_name
42  0, // tp_basicsize
43  0, // tp_itemsize
44  0, // tp_dealloc
45  0, // tp_print
46  0, // tp_getattr
47  0, // tp_setattr
48  0, // tp_compare
49  0, // tp_repr
50  0, // tp_as_number
51  0, // tp_as_sequence
52  0, // tp_as_mapping
53  0, // tp_hash
54  0, // tp_call
55  0, // tp_str
56  0, // tp_getattro
57  0, // tp_setattro
58  0, // tp_as_buffer
59  Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES |
60  Py_TPFLAGS_BASETYPE, // tp_flags
61  (char*)"PyROOT long object for pass by reference", // tp_doc
62  0, // tp_traverse
63  0, // tp_clear
64  0, // tp_richcompare
65  0, // tp_weaklistoffset
66  0, // tp_iter
67  0, // tp_iternext
68  0, // tp_methods
69  0, // tp_members
70  0, // tp_getset
71  &PyTuple_Type, // tp_base
72  0, // tp_dict
73  0, // tp_descr_get
74  0, // tp_descr_set
75  0, // tp_dictoffset
76  0, // tp_init
77  0, // tp_alloc
78  0, // tp_new
79  0, // tp_free
80  0, // tp_is_gc
81  0, // tp_bases
82  0, // tp_mro
83  0, // tp_cache
84  0, // tp_subclasses
85  0 // tp_weaklist
86 #if PY_VERSION_HEX >= 0x02030000
87  , 0 // tp_del
88 #endif
89 #if PY_VERSION_HEX >= 0x02060000
90  , 0 // tp_version_tag
91 #endif
92 #if PY_VERSION_HEX >= 0x03040000
93  , 0 // tp_finalize
94 #endif
95 };
96 
97 } // namespace PyROOT
TCppScope_t TCppType_t
Definition: Cppyy.h:13
PyTypeObject TTupleOfInstances_Type
Representation of C-style array of instances.
#define PyVarObject_HEAD_INIT(type, size)
Definition: PyROOT.h:149
PyObject * TTupleOfInstances_New(Cppyy::TCppObject_t address, Cppyy::TCppType_t klass, Py_ssize_t nelems)
void * TCppObject_t
Definition: Cppyy.h:14
const Bool_t kFALSE
Definition: RtypesCore.h:88
size_t SizeOf(TCppType_t klass)
Definition: Cppyy.cxx:218
int Py_ssize_t
Definition: PyROOT.h:156
PyObject * BindCppObject(Cppyy::TCppObject_t object, Cppyy::TCppType_t klass, Bool_t isRef=kFALSE)
if the object is a null pointer, return a typed one (as needed for overloading)
_object PyObject
Definition: TPyArg.h:20