cpython/Include/boolobject.h

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/* Boolean object interface */
typedef PyIntObject PyBoolObject;
extern DL_IMPORT(PyTypeObject) PyBool_Type;
#define PyBool_Check(x) ((x)->ob_type == &PyBool_Type)
/* Py_False and Py_True are the only two bools in existence.
Don't forget to apply Py_INCREF() when returning either!!! */
/* Don't use these directly */
extern DL_IMPORT(PyIntObject) _Py_ZeroStruct, _Py_TrueStruct;
/* Use these macros */
#define Py_False ((PyObject *) &_Py_ZeroStruct)
#define Py_True ((PyObject *) &_Py_TrueStruct)
/* Function to return a bool from a C long */
PyObject *PyBool_FromLong(long);