Struct caffe2_imports::PyRef
source · pub struct PyRef<'p, T>where
T: PyClass,{ /* private fields */ }
Expand description
A wrapper type for an immutably borrowed value from a PyCell
<T>
.
See the PyCell
documentation for more information.
Examples
You can use PyRef
as an alternative to a &self
receiver when
- you need to access the pointer of the
PyCell
, or - you want to get a super class.
#[pyclass(subclass)]
struct Parent {
basename: &'static str,
}
#[pyclass(extends=Parent)]
struct Child {
name: &'static str,
}
#[pymethods]
impl Child {
#[new]
fn new() -> (Self, Parent) {
(Child { name: "Caterpillar" }, Parent { basename: "Butterfly" })
}
fn format(slf: PyRef<'_, Self>) -> String {
// We can get *mut ffi::PyObject from PyRef
use pyo3::AsPyPointer;
let refcnt = unsafe { pyo3::ffi::Py_REFCNT(slf.as_ptr()) };
// We can get &Self::BaseType by as_ref
let basename = slf.as_ref().basename;
format!("{}(base: {}, cnt: {})", slf.name, basename, refcnt)
}
}
See the module-level documentation for more information.
Implementations§
source§impl<'p, T, U> PyRef<'p, T>where
T: PyClass<BaseType = U>,
U: PyClass,
impl<'p, T, U> PyRef<'p, T>where T: PyClass<BaseType = U>, U: PyClass,
sourcepub fn into_super(self) -> PyRef<'p, U>
pub fn into_super(self) -> PyRef<'p, U>
Gets a PyRef<T::BaseType>
.
While as_ref()
returns a reference of type &T::BaseType
, this cannot be
used to get the base of T::BaseType
.
But with the help of this method, you can get hold of instances of the super-superclass when needed.
Examples
#[pyclass(subclass)]
struct Base1 {
name1: &'static str,
}
#[pyclass(extends=Base1, subclass)]
struct Base2 {
name2: &'static str,
}
#[pyclass(extends=Base2)]
struct Sub {
name3: &'static str,
}
#[pymethods]
impl Sub {
#[new]
fn new() -> PyClassInitializer<Self> {
PyClassInitializer::from(Base1 { name1: "base1" })
.add_subclass(Base2 { name2: "base2" })
.add_subclass(Self { name3: "sub" })
}
fn name(slf: PyRef<'_, Self>) -> String {
let subname = slf.name3;
let super_ = slf.into_super();
format!("{} {} {}", super_.as_ref().name1, super_.name2, subname)
}
}
Trait Implementations§
source§impl<'a, T> AsPyPointer for PyRef<'a, T>where
T: PyClass,
impl<'a, T> AsPyPointer for PyRef<'a, T>where T: PyClass,
source§impl<'a, T> FromPyObject<'a> for PyRef<'a, T>where
T: PyClass,
impl<'a, T> FromPyObject<'a> for PyRef<'a, T>where T: PyClass,
Auto Trait Implementations§
impl<'p, T> !RefUnwindSafe for PyRef<'p, T>
impl<'p, T> !Send for PyRef<'p, T>
impl<'p, T> !Sync for PyRef<'p, T>
impl<'p, T> Unpin for PyRef<'p, T>
impl<'p, T> !UnwindSafe for PyRef<'p, T>
Blanket Implementations§
§impl<T> Pointable for T
impl<T> Pointable for T
§impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
impl<SS, SP> SupersetOf<SS> for SPwhere SS: SubsetOf<SP>,
§fn to_subset(&self) -> Option<SS>
fn to_subset(&self) -> Option<SS>
The inverse inclusion map: attempts to construct
self
from the equivalent element of its
superset. Read more§fn is_in_subset(&self) -> bool
fn is_in_subset(&self) -> bool
Checks if
self
is actually part of its subset T
(and can be converted to it).§fn to_subset_unchecked(&self) -> SS
fn to_subset_unchecked(&self) -> SS
Use with care! Same as
self.to_subset
but without any property checks. Always succeeds.§fn from_subset(element: &SS) -> SP
fn from_subset(element: &SS) -> SP
The inclusion map: converts
self
to the equivalent element of its superset.