flatmultiindex.hh

// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_FUNCTIONS_FUNCTIONSPACEBASES_FLATMULTIINDEX_HH
#define DUNE_FUNCTIONS_FUNCTIONSPACEBASES_FLATMULTIINDEX_HH
 
#include <array>
 
#include <dune/common/hash.hh>
 
namespace Dune {
namespace Functions {
 
 
 
template<class size_type>
class FlatMultiIndex :
  public std::array<size_type,1>
{
public:
 
  constexpr FlatMultiIndex() = default;
 
  FlatMultiIndex(std::initializer_list<size_type> const &l) :
    std::array<size_type,1>{{*l.begin()}}
  {}
 
  operator const size_type& () const
  {
    return this->operator[](0);
  }
 
  operator size_type& ()
  {
    return this->operator[](0);
  }
 
  inline friend std::size_t hash_value(const FlatMultiIndex& arg) noexcept
  {
    return std::hash<size_type>()(arg);
  }
 
  static constexpr std::size_t max_size() { return 1; }
};
 
 
 
} // end namespace Functions
} // end namespace Dune
 
DUNE_DEFINE_HASH(DUNE_HASH_TEMPLATE_ARGS(typename size_type),DUNE_HASH_TYPE(Dune::Functions::FlatMultiIndex<size_type>))
 
#endif // DUNE_FUNCTIONS_FUNCTIONSPACEBASES_FLATMULTIINDEX_HH