Function copy_d_to_h 

pub unsafe fn copy_d_to_h<T>(
    dst: *mut T,
    src: DevicePtr,
    count: usize,
) -> Result<()>

Copy count elements of type T from device memory to host memory.

Safety

dst must be valid for count writes. src must be a valid device allocation of at least count * size_of::<T>() bytes.