Method with_borrowed_ptr

src/conversion.rs:55–63

(&self, py: Python, f: F)

    /// to touch any reference counts when the input object already is a Python object.
    #[inline]
    fn with_borrowed_ptr<F, R>(&self, py: Python, f: F) -> R
    where
        F: FnOnce(*mut ffi::PyObject) -> R,
    {
        let obj = self.to_py_object(py).into_object();
        let res = f(obj.as_ptr());
        obj.release_ref(py);
        res
    }

    // FFI functions that accept a borrowed reference will use:
    //   input.with_borrowed_ptr(|obj| ffi::Call(obj)