Child Extraction

Typedefs
template<typename Node , std::size_t... indices>
using	Dune::TypeTree::Child = typename impl::_Child< Node, indices... >::type
	Template alias for the type of a child node given by a list of child indices. More...
template<typename Node , typename TreePath >
using	Dune::TypeTree::ChildForTreePath = typename impl::_ChildForTreePath< Node, TreePath >::type
	Template alias for the type of a child node given by a TreePath or a HybridTreePath type. More...
template<typename T >
using	Dune::TypeTree::is_flat_index = typename impl::_is_flat_index< std::decay_t< T > >::type
	Type trait that determines whether T is a flat index in the context of child extraction.

Functions
template<typename Node , typename... Indices>
ImplementationDefined	Dune::TypeTree::child (Node &&node, Indices... indices)
	Extracts the child of a node given by a sequence of compile-time and run-time indices. More...
template<typename Node , typename... Indices>
ImplementationDefined	Dune::TypeTree::child (Node &&node, HybridTreePath< Indices... > treePath)
	Extracts the child of a node given by a HybridTreePath object. More...

Detailed Description

Utility functions and metafunctions for extracting children from a TypeTree.

Typedef Documentation

Child

template<typename Node , std::size_t... indices>

using Dune::TypeTree::Child = typedef typename impl::_Child<Node,indices...>::type

Template alias for the type of a child node given by a list of child indices.

This template alias is implemented in terms of the free-standing child() functions and uses those in combination with decltype() to extract the child type.

Template Parameters

Node	The type of the parent node.
indices	A list of index values the describes the path to the wanted child.

ChildForTreePath

template<typename Node , typename TreePath >

using Dune::TypeTree::ChildForTreePath = typedef typename impl::_ChildForTreePath<Node,TreePath>::type

Template alias for the type of a child node given by a TreePath or a HybridTreePath type.

This template alias is implemented in terms of the free-standing child() functions and uses those in combination with decltype() to extract the child type. It supports both TreePath and HybridTreePath.

Template Parameters

Node	The type of the parent node.
TreePath	The type of a TreePath or a HybridTreePath that describes the path to the wanted child.

Function Documentation

child() [1/2]

template<typename Node , typename... Indices>

ImplementationDefined Dune::TypeTree::child	(	Node &&	node,
		HybridTreePath< Indices... >	treePath
	)

Extracts the child of a node given by a HybridTreePath object.

Use this function to extract a (possibly indirect) child of a TypeTree node.

Example:

using namespace Dune::TypeTree::Indices; // for compile-time indices
auto tp = Dune::TypeTree::hybridTreePath(_4,2,_0,1);
auto&& c = child(node,tp);

returns the second child of the first child of the third child of the fifth child of node, where some child lookups were done using a compile-time index and some using a run-time index.

Parameters

node	The node from which to extract the child.
tree{ath	A HybridTreePath that describes the path into the tree to the wanted child. This tree path object can be a combination of run time indices (for tree nodes that allow accessing their children using run time information, like PowerNode) and instances of index_constant, which work for all types of inner nodes.

Returns

A reference to the child, its cv-qualification depends on the passed-in node.

child() [2/2]

template<typename Node , typename... Indices>

ImplementationDefined Dune::TypeTree::child	(	Node &&	node,
		Indices...	indices
	)

Extracts the child of a node given by a sequence of compile-time and run-time indices.

Use this function to extract a (possibly indirect) child of a TypeTree node.

Example:

using namespace Dune::Indices;   // for compile-time indices
auto&& c = child(node,_4,2,_0,1);

returns the second child of the first child of the third child of the fifth child of node, where some child lookups were done using a compile-time index and some using a run-time index.

Parameters

node	The node from which to extract the child.
indices...	A list of indices that describes the path into the tree to the wanted child. These parameters can be a combination of run time indices (for tree nodes that allow accessing their children using run time information, like PowerNode) and instances of index_constant, which work for all types of inner nodes.

Returns

A reference to the child, its cv-qualification depends on the passed-in node.

Referenced by Dune::TypeTree::CompositeNode< Children >::child(), Dune::TypeTree::PowerNode< T, k >::child(), Dune::ALU3dGridEntity< 0, dim, GridImp >::geometryInFather(), and Dune::Functions::SubspaceLocalView< RLV, PP >::tree().