dummyiterator.hh

// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
// SPDX-FileCopyrightInfo: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
#ifndef DUNE_COMMON_DUMMYITERATOR_HH
#define DUNE_COMMON_DUMMYITERATOR_HH
 
#include <cstddef>
#include <type_traits>
 
#include <dune/common/iteratorfacades.hh>
 
template<typename T>
class dummyiterator
  : public Dune::BidirectionalIteratorFacade<dummyiterator<T>, T, T&,
        std::ptrdiff_t>
{
  friend class dummyiterator<const typename std::remove_const<T>::type>;
 
  T *value;
 
public:
  dummyiterator(T& value_)
    : value(&value_)
  {}
 
  template<typename T2>
  dummyiterator
    ( const dummyiterator<T2>& o,
    typename std::enable_if<std::is_convertible<T2&, T&>::value>::type* = 0)
    : value(o.value)
  {}
 
  T& dereference() const {
    return *value;
  }
 
  bool equals(const dummyiterator& o) const {
    return value == o.value;
  }
 
  void increment() {}
  void decrement() {}
};
 
#endif // DUNE_COMMON_DUMMYITERATOR_HH