Mark a struct as a reference tag by inheriting from this.
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#include <Tag.hpp>
Detailed Description
Mark a struct as a reference tag by inheriting from this.
Details
A reference tag is used to identify an item in a DataBox that is a const reference to a sub-item of another item (such as a Variables or GlobalCache) in the DataBox
Derived Class Requires:
type alias base that is the simple tag from which the reference tag is derived
type alias argument_tags that lists tags needed to evaluate get
static function get that, given the items fetched by argument_tags, returns a const reference to the sub-item
A reference tag may optionally specify a static std::stringname() method to override the default name produced by db::tag_name.
Warning
A reference tag should only be derived from a simple tag and db::ReferenceTag.