Trait MaybeTraverse 

pub trait MaybeTraverse {
    const HAS_TRAVERSE: bool = false;
    const HAS_CLEAR: bool = false;

    // Required method
    fn try_traverse(&self, traverse_fn: &mut TraverseFn<'_>);

    // Provided method
    fn try_clear(&mut self, _out: &mut Vec<PyObjectRef>) { ... }
}

This trait is used as a “Optional Trait”(I ’d like to use Trace? but it’s not allowed yet) for PyObjectPayload type

impl for PyObjectPayload, pyclass proc macro will handle the actual dispatch if type impl Trace Every PyObjectPayload impl MaybeTrace, which may or may not be traceable

Provided Associated Constants

const HAS_TRAVERSE: bool = false

if is traceable, will be used by vtable to determine

const HAS_CLEAR: bool = false

if has clear implementation for circular reference resolution (tp_clear)

Required Methods

fn try_traverse(&self, traverse_fn: &mut TraverseFn<'_>)

Provided Methods

fn try_clear(&mut self, _out: &mut Vec<PyObjectRef>)

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl MaybeTraverse for PyArithmeticError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyAssertionError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyAsyncGen

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyAttributeError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyBaseException

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyBaseExceptionGroup

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyBaseObject

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyBlockingIOError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyBool

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyBoundMethod

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyBrokenPipeError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyBufferError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyByteArray

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyBytes

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyBytesWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyCallableIterator

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyCapsule

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyChildProcessError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyClassMethod

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyCode

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyComplex

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyConnectionAbortedError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyConnectionError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyConnectionRefusedError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyConnectionResetError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyCoroutine

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyDeprecationWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyDict

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyEOFError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyEllipsis

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyEncodingWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyEnumerate

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyException

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyFileExistsError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyFileNotFoundError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyFilter

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyFloat

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyFloatingPointError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyFrozenSet

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyFunction

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyFutureWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyGenerator

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyGeneratorExit

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyGenericAlias

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyGetSet

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyImportError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyImportWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyIncompleteInputError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyIndentationError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyIndexError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyInt

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyInterpolation

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyInterruptedError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyIsADirectoryError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyKeyError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyKeyboardInterrupt

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyList

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyLookupError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyMap

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyMappingProxy

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyMemoryError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyMemoryView

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyModule

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyModuleDef

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyModuleNotFoundError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyNameError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyNamespace

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyNone

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyNotADirectoryError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyNotImplemented

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyNotImplementedError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyOSError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyOverflowError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyPendingDeprecationWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyPermissionError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyProcessLookupError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyProperty

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyPythonFinalizationError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyRange

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyRecursionError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyReferenceError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyResourceWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyRuntimeError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyRuntimeWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PySequenceIterator

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PySet

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PySlice

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyStaticMethod

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyStopAsyncIteration

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyStopIteration

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyStr

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PySuper

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PySyntaxError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PySyntaxWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PySystemError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PySystemExit

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyTabError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyTemplate

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyTemplateIter

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyTimeoutError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyTraceback

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyTuple

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyType

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyTypeError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyUnboundLocalError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyUnicodeDecodeError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyUnicodeEncodeError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyUnicodeError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyUnicodeTranslateError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyUnicodeWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyUnion

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyUserWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyUtf8Str

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyValueError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyWarning

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyWeak

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyWeakProxy

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for PyZeroDivisionError

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for PyZip

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for Frame

const HAS_TRAVERSE: bool = true

const HAS_CLEAR: bool = true

impl MaybeTraverse for HeapMethodDef

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for VecBuffer

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for Generic

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for NoDefault

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for ParamSpec

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for ParamSpecArgs

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for ParamSpecKwargs

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for TypeVar

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false

impl MaybeTraverse for TypeVarTuple

const HAS_TRAVERSE: bool = false

const HAS_CLEAR: bool = false