In SYCL some SYCL runtime classes are available to the SYCL application, some are available within a SYCL kernel function and some are available on both and can be passed as arguments to a SYCL kernel function.
Each of the following SYCL runtime classes must be available to the host application: :ref:`buffer`, :ref:`buffer_allocator`, :ref:`context`, :ref:`device`, :ref:`device_image`, :ref:`event`, :ref:`exception`, :ref:`handler`, :ref:`host_accessor`, :ref:`host_sampled_image_accessor`, :ref:`host_unsampled_image_accessor`, :ref:`id`, :ref:`image_allocator`, :ref:`kernel`, :ref:`kernel_id`, :ref:`marray`, kernel_bundle, :ref:`nd_range`, :ref:`platform`, :ref:`queue`, :ref:`range`, :ref:`sampled_image`, :ref:`image_sampler`, :ref:`stream`, :ref:`unsampled_image` and :ref:`vec`.
Each of the following SYCL runtime classes must be available within a SYCL kernel function: :ref:`command-accessor`, :ref:`atomic_ref`, :ref:`device_event`, :ref:`group`, :ref:`h_item`, :ref:`id`, :ref:`item`, :ref:`local_accessor`, :ref:`marray`, :ref:`multi_ptr`, :ref:`nd_item`, :ref:`range`, :ref:`reducer`, :ref:`sampled_image_accessor`, :ref:`stream`, :ref:`sub_group`, :ref:`unsampled_image_accessor` and :ref:`vec`.
.. seealso:: |SYCL_SPEC_CLASS_AVLBL|