Trait pyo3::PyTryFrom

pub trait PyTryFrom: Sized {
    fn try_from(value: &PyObjectRef) -> Result<&Self, PyDowncastError>;
    fn try_from_exact(value: &PyObjectRef) -> Result<&Self, PyDowncastError>;
    fn try_from_mut(value: &PyObjectRef) -> Result<&mut Self, PyDowncastError>;
    fn try_from_mut_exact(
        value: &PyObjectRef
    ) -> Result<&mut Self, PyDowncastError>;
    unsafe fn try_from_unchecked(value: &PyObjectRef) -> &Self;
    unsafe fn try_from_mut_unchecked(value: &PyObjectRef) -> &mut Self;
}

Trait implemented by Python object types that allow a checked downcast. This trait is similar to std::convert::TryFrom

Required methods

fn try_from(value: &PyObjectRef) -> Result<&Self, PyDowncastError>

Cast from a concrete Python object type to PyObject.

fn try_from_exact(value: &PyObjectRef) -> Result<&Self, PyDowncastError>

Cast from a concrete Python object type to PyObject. With exact type check.

fn try_from_mut(value: &PyObjectRef) -> Result<&mut Self, PyDowncastError>

Cast from a concrete Python object type to PyObject.

fn try_from_mut_exact(value: &PyObjectRef) -> Result<&mut Self, PyDowncastError>

Cast from a concrete Python object type to PyObject. With exact type check.

unsafe fn try_from_unchecked(value: &PyObjectRef) -> &Self

Cast a PyObjectRef to a specific type of PyObject. The caller must have already verified the reference is for this type.

unsafe fn try_from_mut_unchecked(value: &PyObjectRef) -> &mut Self

Cast a PyObjectRef to a specific type of PyObject. The caller must have already verified the reference is for this type.

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Implementors

impl PyTryFrom for PySequence

fn try_from(value: &PyObjectRef) -> Result<&PySequence, PyDowncastError>

fn try_from_exact(value: &PyObjectRef) -> Result<&PySequence, PyDowncastError>

fn try_from_mut(value: &PyObjectRef) -> Result<&mut PySequence, PyDowncastError>

fn try_from_mut_exact(
    value: &PyObjectRef
) -> Result<&mut PySequence, PyDowncastError>

unsafe fn try_from_unchecked(value: &PyObjectRef) -> &PySequence

unsafe fn try_from_mut_unchecked(value: &PyObjectRef) -> &mut PySequence

impl<T> PyTryFrom for T where
    T: PyTypeInfo, 

fn try_from(value: &PyObjectRef) -> Result<&T, PyDowncastError>

fn try_from_exact(value: &PyObjectRef) -> Result<&T, PyDowncastError>

fn try_from_mut(value: &PyObjectRef) -> Result<&mut T, PyDowncastError>

fn try_from_mut_exact(value: &PyObjectRef) -> Result<&mut T, PyDowncastError>

unsafe fn try_from_unchecked(value: &PyObjectRef) -> &T

unsafe fn try_from_mut_unchecked(value: &PyObjectRef) -> &mut T

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