# Requirements on parallel_do body

Class `Body` implementing the concept of parallel_do body must define:

-             B::operator()(
                      cv_item_type item,
                      parallel_do_feeder<item_type>& feeder
              ) const

              OR

              B::operator()( cv_item_type& item ) const

  Process item. May be invoked concurrently for the same `this` but different `item`.

-      item_type( const item_type& )

  Copy a work item.

-      ~item_type()

  Destroy a work item

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