indexedsliceiterator.hh

Go to the documentation of this file.

// -*- tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
// vi: set ts=8 sw=4 et sts=4:
 
// SPDX-FileCopyrightText: Copyright © DUNE-FUFEM Project contributors, see file AUTHORS.md
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception OR LGPL-3.0-or-later
 
#ifndef DUNE_FUFEM_INDEXED_SLICE_ITERATOR_HH
#define DUNE_FUFEM_INDEXED_SLICE_ITERATOR_HH
 
#include <dune/common/iteratorfacades.hh>
 
 
template<class BaseIterator, class Value>
class IndexedSliceIterator :
    public Dune::ForwardIteratorFacade<IndexedSliceIterator<BaseIterator, Value>,Value>
{
    typedef typename Dune::ForwardIteratorFacade<IndexedSliceIterator<BaseIterator, Value>,Value> Base;
 
public:
    typedef std::size_t size_type;
 
    IndexedSliceIterator() :
        index_(0),
        itStride_(1),
        indexStride_(1)
    {}
 
    IndexedSliceIterator(const BaseIterator& it, size_type index, size_type itStride=1, size_type indexStride=1) :
        it_(it),
        itStride_(itStride),
        index_(index),
        indexStride_(indexStride)
    {}
 
    typename Base::Reference dereference() const
    {
        return *it_;
    }
 
    bool equals(const IndexedSliceIterator& other) const
    {
        if (itStride_==0)
            return (index_ == other.index_);
        else
            return (it_ == other.it_);
    }
 
    void increment()
    {
        index_ += indexStride_;
        for(size_type i=0; i != itStride_; ++i)
            ++it_;
    }
 
    size_type index() const
    {
        return index_;
    }
 
protected:
    BaseIterator it_;
    size_type itStride_;
    size_type index_;
    size_type indexStride_;
};
 
#endif