Function cuda_memcpy 

pub unsafe fn cuda_memcpy<const SRC_DEVICE: bool, const DST_DEVICE: bool>(
    dst: *mut c_void,
    src: *const c_void,
    size_bytes: usize,
) -> Result<(), MemCopyError>

FFI binding for the cudaMemcpyAsync function on the default cuda stream.

Safety

Must follow the rules of the cudaMemcpyAsync function from the CUDA runtime API.