Line data    Source code

       1            0 : // Distributed under the MIT License.
       2              : // See LICENSE.txt for details.
       3              : 
       4              : #pragma once
       5              : 
       6              : #include "DataStructures/DataBox/Subitems.hpp"
       7              : #include "DataStructures/DataBox/Tag.hpp"
       8              : #include "Utilities/TMPL.hpp"
       9              : 
      10              : namespace Tags {
      11              : 
      12              : /// \cond
      13              : // Declaration of a tag for a subitem
      14              : // Unless specialized, it will be the reference tag below,
      15              : template <typename Tag, typename ParentTag, typename = std::nullptr_t>
      16              : struct Subitem;
      17              : /// \endcond
      18              : 
      19              : /// \brief a reference tag that refers to a particular Tag that is a subitem of
      20              : /// an item tagged with ParentTag
      21              : template <typename Tag, typename ParentTag, typename>
      22            1 : struct Subitem : Tag, db::ReferenceTag {
      23            0 :   using base = Tag;
      24            0 :   using argument_tags = tmpl::list<typename ParentTag::base>;
      25            0 :   static const auto& get(
      26              :       const typename ParentTag::type& parent_value) {
      27              :     return ::db::Subitems<ParentTag>::template create_compute_item<base>(
      28              :         parent_value);
      29              :   }
      30              : };
      31              : }  // namespace Tags