db::DataBox< tmpl::list< Tags... > > Class Template Reference

A DataBox stores objects that can be retrieved by using Tags. More...

#include <DataBox.hpp>

Public Types
using	tags_list = tmpl::list< Tags... >
	A typelist (tmpl::list) of Tags that the DataBox holds.
using	immutable_item_tags = tmpl::filter< tags_list, db::is_immutable_item_tag< tmpl::_1 > >
	A list of all the immutable item tags, including their subitems. Immutable items are compute tags and reference tags.
using	immutable_item_creation_tags = tmpl::remove_if< immutable_item_tags, tt::is_a<::Tags::Subitem, tmpl::_1 > >
	A list of all the immutable item tags used to create the DataBox. More...
using	mutable_item_tags = tmpl::filter< tags_list, db::is_mutable_item_tag< tmpl::_1 > >
	A list of all the mutable item tags, including their subitems.
using	mutable_subitem_tags = tmpl::flatten< tmpl::transform< mutable_item_tags, db::Subitems< tmpl::_1 > > >
	A list of the expanded simple subitems, not including the main Subitem tags themselves. More...
using	mutable_item_creation_tags = tmpl::list_difference< mutable_item_tags, mutable_subitem_tags >
	A list of all the mutable item tags used to create the DataBox. More...
using	compute_item_tags = tmpl::filter< immutable_item_tags, db::is_compute_tag< tmpl::_1 > >
	A list of all the compute item tags.
using	reference_item_tags = tmpl::filter< immutable_item_tags, db::is_reference_tag< tmpl::_1 > >
	A list of all the reference tags.

Public Member Functions
std::string	print_types () const
	Print the expanded type aliases.
std::string	print_items () const
	Print the items.
template<typename Tag >
const auto &	get () const
	Retrieve the tag Tag, should be called by the free function db::get.
template<typename... TagsOfItemsToCopy>
tuples::TaggedTuple< TagsOfItemsToCopy... >	copy_items () const
	Copy the items with tags TagsOfItemsToCopy from the DataBox into a TaggedTuple, should be called by the free function db::copy_items.
template<typename Tag >
auto &	get_mutable_reference ()
	Retrieve a mutable reference to the tag Tag, should be called by the free function db::get_mutable_reference.
void	pup (PUP::er &p)
template<typename... AddMutableItemTags, typename AddImmutableItemTagsList , typename... Args>
constexpr	DataBox (tmpl::list< AddMutableItemTags... >, AddImmutableItemTagsList, Args &&... args)

Static Public Member Functions
template<typename Consumer , typename Provider >
static constexpr bool	tag_depends_on ()
	Check whether a tags depends on another tag. Should be called through the metafunction db::tag_depends_on.

Friends
template<typename CopiedItemsTagList , typename DbTagList >
auto	copy_items (const DataBox< DbTagList > &box)
	Copy the items from the DataBox into a TaggedTuple. More...
template<typename... MutateTags, typename TagList , typename Invokable , typename... Args>
decltype(auto)	mutate (gsl::not_null< DataBox< TagList > * > box, Invokable &&invokable, Args &&... args)

Detailed Description

template<typename... Tags>
class db::DataBox< tmpl::list< Tags... > >

A DataBox stores objects that can be retrieved by using Tags.

Warning

The order of the tags in DataBoxes returned by db::create depends on implementation-defined behavior, and therefore should not be specified in source files. If explicitly naming a DataBox type is necessary they should be generated using db::compute_databox_type.

See also

db::create

Template Parameters

Tags	list of DataBoxTag's

Member Typedef Documentation

immutable_item_creation_tags

template<typename... Tags>

using db::DataBox< tmpl::list< Tags... > >::immutable_item_creation_tags = tmpl::remove_if<immutable_item_tags, tt::is_a<::Tags::Subitem, tmpl::_1> >

A list of all the immutable item tags used to create the DataBox.

Note

This does not include subitems of immutable items

mutable_item_creation_tags

template<typename... Tags>

using db::DataBox< tmpl::list< Tags... > >::mutable_item_creation_tags = tmpl::list_difference<mutable_item_tags, mutable_subitem_tags>

A list of all the mutable item tags used to create the DataBox.

Note

This does not include subitems of mutable items

mutable_subitem_tags

template<typename... Tags>

using db::DataBox< tmpl::list< Tags... > >::mutable_subitem_tags = tmpl::flatten< tmpl::transform<mutable_item_tags, db::Subitems<tmpl::_1> >>

A list of the expanded simple subitems, not including the main Subitem tags themselves.

Specifically, if there is a Variables<Tag0, Tag1>, then this list would contain Tag0, Tag1.

Friends And Related Function Documentation

copy_items

template<typename... Tags>

template<typename CopiedItemsTagList , typename DbTagList >

auto copy_items ( const DataBox< DbTagList > &  box )

friend

Copy the items from the DataBox into a TaggedTuple.

Returns: The objects corresponding to CopiedItemsTagList

Note

The tags in CopiedItemsTagList must be a subset of the mutable_item_creation_tags of the DataBox

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The documentation for this class was generated from the following file:

• src/DataStructures/DataBox/DataBox.hpp