Dune::TypeTree::AccumulateValue< Tree, Functor, Reduction, startValue, ParentChildReduction > Struct Template Reference

Statically accumulate a value over the nodes of a TypeTree. More...

#include <dune/typetree/accumulate_static.hh>

Public Types
typedef Functor::result_type	result_type
	The result type of the computation.

Static Public Attributes
static const result_type	result = accumulate_value<Tree,Functor,Reduction,ParentChildReduction,startValue,HybridTreePath<>,NodeTag<Tree>>::result
	The accumulated result of the computation.

Detailed Description

template<typename Tree, typename Functor, typename Reduction, typename Functor::result_type startValue, typename ParentChildReduction = Reduction>
struct Dune::TypeTree::AccumulateValue< Tree, Functor, Reduction, startValue, ParentChildReduction >

Statically accumulate a value over the nodes of a TypeTree.

This struct implements an algorithm for iterating over a tree and calculating an accumulated value at compile time.

Template Parameters

Tree	The tree to iterate over.
Functor	The compile-time functor used for visiting each node.

This functor must implement the following interface:

struct AccumulationFunctor
{
 
  // The result type of the overall computation.
  typedef ... result_type;
 
  // Decide whether to include the given node in the calculation
  // or to skip it.
  template<typename Node, typename TreePath>
  struct doVisit
  {
    static const bool value = true;
  };
 
  // Calculate the per-node result.
  template<typename Node, typename TreePath>
  struct visit
  {
    static const result_type result = ...;
  };
 
};

Template Parameters

Reduction

The reduction operator used to accumulate the per-node results.

The reduction operator must implement the following interface:

template<typename result_type>
struct ReductionOperator
{
 
  // combine two per-node results
  template<result_type r1, result_type r2>
  struct reduce
  {
    static const result_type result = ...;
  };
 
};

Template Parameters

startValue

The starting value fed into the initial accumulation step.

---

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

• dune/typetree/accumulate_static.hh