Trait OffsetCalculator

pub unsafe trait OffsetCalculator<T: PyClass, U> {
    // Required method
    fn offset() -> usize;
}

Helper trait to locate field within a #[pyclass] for a #[pyo3(get)].

Below MSRV 1.77 we can’t use std::mem::offset_of!, and the replacement in memoffset::offset_of doesn’t work in const contexts for types containing UnsafeCell.

Safety

The trait is unsafe to implement because producing an incorrect offset will lead to UB.

Required Methods

fn offset() -> usize

Offset to the field within a PyClassObject<T>, in bytes.

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