Function enable_dynamic_attributes

include/pybind11/detail/class.h:608–624

Give instances of this type a `__dict__` and opt into garbage collection.

/// Give instances of this type a `__dict__` and opt into garbage collection.
inline void enable_dynamic_attributes(PyHeapTypeObject *heap_type) {
    auto *type = &heap_type->ht_type;
    type->tp_flags |= Py_TPFLAGS_HAVE_GC;
#ifdef PYBIND11_BACKWARD_COMPATIBILITY_TP_DICTOFFSET
    type->tp_dictoffset = type->tp_basicsize;           // place dict at the end
    type->tp_basicsize += (ssize_t) sizeof(PyObject *); // and allocate enough space for it
#else
    type->tp_flags |= Py_TPFLAGS_MANAGED_DICT;
#endif
    type->tp_traverse = pybind11_traverse;
    type->tp_clear = pybind11_clear;

    static PyGetSetDef getset[]
        = {{"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict, nullptr, nullptr},
           {nullptr, nullptr, nullptr, nullptr, nullptr}};
    type->tp_getset = getset;
}

/// buffer_protocol: Fill in the view as specified by flags.
extern "C" inline int pybind11_getbuffer(PyObject *obj, Py_buffer *view, int flags) {