1 /* Boolean type, a subtype of int */
5 /* We need to define bool_print to override int_print */
8 bool_print(PyBoolObject *self, FILE *fp, int flags)
10 Py_BEGIN_ALLOW_THREADS
11 fputs(self->ob_ival == 0 ? "False" : "True", fp);
16 /* We define bool_repr to return "False" or "True" */
18 static PyObject *false_str = NULL;
19 static PyObject *true_str = NULL;
22 bool_repr(PyBoolObject *self)
27 s = true_str ? true_str :
28 (true_str = PyString_InternFromString("True"));
30 s = false_str ? false_str :
31 (false_str = PyString_InternFromString("False"));
36 /* Function to return a bool from a C long */
38 PyObject *PyBool_FromLong(long ok)
50 /* We define bool_new to always return either Py_True or Py_False */
53 bool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
55 static char *kwlist[] = {"x", 0};
56 PyObject *x = Py_False;
59 if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:bool", kwlist, &x))
61 ok = PyObject_IsTrue(x);
64 return PyBool_FromLong(ok);
67 /* Arithmetic operations redefined to return bool if both args are bool. */
70 bool_and(PyObject *a, PyObject *b)
72 if (!PyBool_Check(a) || !PyBool_Check(b))
73 return PyInt_Type.tp_as_number->nb_and(a, b);
74 return PyBool_FromLong(
75 ((PyBoolObject *)a)->ob_ival & ((PyBoolObject *)b)->ob_ival);
79 bool_or(PyObject *a, PyObject *b)
81 if (!PyBool_Check(a) || !PyBool_Check(b))
82 return PyInt_Type.tp_as_number->nb_or(a, b);
83 return PyBool_FromLong(
84 ((PyBoolObject *)a)->ob_ival | ((PyBoolObject *)b)->ob_ival);
88 bool_xor(PyObject *a, PyObject *b)
90 if (!PyBool_Check(a) || !PyBool_Check(b))
91 return PyInt_Type.tp_as_number->nb_xor(a, b);
92 return PyBool_FromLong(
93 ((PyBoolObject *)a)->ob_ival ^ ((PyBoolObject *)b)->ob_ival);
98 PyDoc_STRVAR(bool_doc,
101 Returns True when the argument x is true, False otherwise.\n\
102 The builtins True and False are the only two instances of the class bool.\n\
103 The class bool is a subclass of the class int, and cannot be subclassed.");
105 /* Arithmetic methods -- only so we can override &, |, ^. */
107 static PyNumberMethods bool_as_number = {
112 0, /* nb_remainder */
122 bool_and, /* nb_and */
123 bool_xor, /* nb_xor */
131 0, /* nb_inplace_add */
132 0, /* nb_inplace_subtract */
133 0, /* nb_inplace_multiply */
134 0, /* nb_inplace_divide */
135 0, /* nb_inplace_remainder */
136 0, /* nb_inplace_power */
137 0, /* nb_inplace_lshift */
138 0, /* nb_inplace_rshift */
139 0, /* nb_inplace_and */
140 0, /* nb_inplace_xor */
141 0, /* nb_inplace_or */
142 0, /* nb_floor_divide */
143 0, /* nb_true_divide */
144 0, /* nb_inplace_floor_divide */
145 0, /* nb_inplace_true_divide */
148 /* The type object for bool. Note that this cannot be subclassed! */
150 PyTypeObject PyBool_Type = {
151 PyVarObject_HEAD_INIT(&PyType_Type, 0)
156 (printfunc)bool_print, /* tp_print */
160 (reprfunc)bool_repr, /* tp_repr */
161 &bool_as_number, /* tp_as_number */
162 0, /* tp_as_sequence */
163 0, /* tp_as_mapping */
166 (reprfunc)bool_repr, /* tp_str */
169 0, /* tp_as_buffer */
170 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES, /* tp_flags */
171 bool_doc, /* tp_doc */
174 0, /* tp_richcompare */
175 0, /* tp_weaklistoffset */
181 &PyInt_Type, /* tp_base */
183 0, /* tp_descr_get */
184 0, /* tp_descr_set */
185 0, /* tp_dictoffset */
188 bool_new, /* tp_new */
191 /* The objects representing bool values False and True */
193 /* Named Zero for link-level compatibility */
194 PyIntObject _Py_ZeroStruct = {
195 PyObject_HEAD_INIT(&PyBool_Type)
199 PyIntObject _Py_TrueStruct = {
200 PyObject_HEAD_INIT(&PyBool_Type)