How to use Vec<MyPyClass> as parameter a of pyfunction?

[tushushu]

Hi there, I have a pyclass as below:

#[pyclass]
pub struct Foo {
    values: Vec<bool>,
}

and a function as below:

#[pyfunction]
pub fn bar(conditions: Vec<&Foo>) -> BooleanList {
    ...
}

The codes above cannot run, because of

the trait `pyo3::FromPyObject<'_>` is not implemented for `std::vec::Vec<&Foo>`

I tried to implement the FromPyObject for Vec<&Foo>, but I cannot find a correct way. Could you give some hint how I could implement this?

[adamreichold]

Have you tried Vec<Py<Foo>>? Py<T> is a pointer to a pyclass T managed by the Python heap. If the Python code passes e.g. a list of Foo to you, then this list will actually contain pointers to Foo instance on the heap.

Alternatively you can pass by value, e.g. Vec<Foo> if that makes sense w.r.t. the semantics of Foo, e.g. I think this requires Foo: Clone, i.e. adding #[derive(Clone)] to struct Foo.

[tushushu]

Thanks so much @adamreichold , the answer helps me to solve the problem. The Py<T>.borrow works.