Dune::ForEachValue< Tuple > Class Template Reference

Helper template which implements iteration over all storage elements in a std::tuple. More...

#include <dune/common/tupleutility.hh>

Public Member Functions
	ForEachValue (Tuple &t)
	Constructor. More...
template<class Functor >
void	apply (Functor &f) const
	Applies a function object to each storage element of the std::tuple. More...

Detailed Description

template<class Tuple>
class Dune::ForEachValue< Tuple >

Helper template which implements iteration over all storage elements in a std::tuple.

Compile-time constructs that allows one to process all elements in a std::tuple. The exact operation performed on an element is defined by a function object, which needs to implement a visit method which is applicable to all storage elements of a std::tuple. Each std::tuple element is visited once, and the iteration is done in ascending order.

The following example implements a function object which counts the elements in a std::tuple

template <class T>
struct Counter
{
  Counter() :
    result_(0)
  {}
 
  template <class T>
  void visit(T& elem)
  {
    ++result_;
  }
 
  int result_;
};

The number of elements in the std::tuple are stored in the member variable result_. The Counter can be used as follows, assuming a std::tuple t of type MyTuple is given:

Counter c;
ForEachValue<MyTuple> forEach(t);
 
forEach.apply(c);
std::cout << "Number of elements is: " << c.result_ << std::endl;

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

• dune/common/tupleutility.hh