Method dealloc

dlib/external/pybind11/include/pybind11/pybind11.h:1930–1946

Deallocates an instance; via holder, if constructed; otherwise via operator delete.

    /// Deallocates an instance; via holder, if constructed; otherwise via operator delete.
    static void dealloc(detail::value_and_holder &v_h) {
        // We could be deallocating because we are cleaning up after a Python exception.
        // If so, the Python error indicator will be set. We need to clear that before
        // running the destructor, in case the destructor code calls more Python.
        // If we don't, the Python API will exit with an exception, and pybind11 will
        // throw error_already_set from the C++ destructor which is forbidden and triggers
        // std::terminate().
        error_scope scope;
        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 detail::function_record *get_function_record(handle h) {
        h = detail::get_function(h);