Method dealloc_impl

include/pybind11/pybind11.h:2840–2849

Deallocates an instance; via holder, if constructed; otherwise via operator delete. NOTE: The Python error indicator needs to cleared BEFORE this function is called. This is because we could be deallocating while cleaning up after a Python exception. If the error indicator is not cleared but the C++ destructor code makes Python C API calls, those calls are likely to generate a new exception, and p

    // throw `error_already_set` from the C++ destructor. This is forbidden and will
    // trigger std::terminate().
    static void dealloc_impl(detail::value_and_holder &v_h) {
        if (v_h.holder_constructed()) {
            v_h.holder<holder_type>().~holder_type();
            v_h.set_holder_constructed(false);
        } else {
            detail::call_operator_delete(
                v_h.value_ptr<type>(), v_h.type->type_size, v_h.type->type_align);
        }
        v_h.value_ptr() = nullptr;
    }

    static void dealloc_without_manipulating_gil(detail::value_and_holder &v_h) {
        error_scope scope;