Trait pyo3::conversion::PyTryFrom[−][src]

pub trait PyTryFrom<'v>: Sized + PyNativeType {
    fn try_from<V: Into<&'v PyAny>>(
        value: V
    ) -> Result<&'v Self, PyDowncastError<'v>>;

    fn try_from_exact<V: Into<&'v PyAny>>(
        value: V
    ) -> Result<&'v Self, PyDowncastError<'v>>;

    unsafe fn try_from_unchecked<V: Into<&'v PyAny>>(value: V) -> &'v Self;
}

Trait implemented by Python object types that allow a checked downcast. If T implements PyTryFrom, we can convert &PyAny to &T.

This trait is similar to std::convert::TryFrom

Required methods

fn try_from<V: Into<&'v PyAny>>(
    value: V
) -> Result<&'v Self, PyDowncastError<'v>>[src]

Cast from a concrete Python object type to PyObject.

fn try_from_exact<V: Into<&'v PyAny>>(
    value: V
) -> Result<&'v Self, PyDowncastError<'v>>[src]

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

unsafe fn try_from_unchecked<V: Into<&'v PyAny>>(value: V) -> &'v Self[src]

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

Safety

Callers must ensure that the type is valid or risk type confusion.

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Implementors

impl<'v> PyTryFrom<'v> for PyIterator[src]

impl<'v> PyTryFrom<'v> for PySequence[src]

impl<'v, T> PyTryFrom<'v> for PyCell<T> where
    T: 'v + PyClass, [src]

impl<'v, T> PyTryFrom<'v> for T where
    T: PyTypeInfo + PyNativeType, [src]

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