mirror of
https://github.com/triqs/dft_tools
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70 lines
2.6 KiB
C++
70 lines
2.6 KiB
C++
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/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2011 by O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#ifndef TRIQS_ARRAYS_ARRAY_ITERATOR_H
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#define TRIQS_ARRAYS_ARRAY_ITERATOR_H
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#include "./make_const.hpp"
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#include <boost/iterator/iterator_facade.hpp>
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namespace triqs { namespace arrays {
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/**
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* Iterator on a couple (IndexMap, StorageType).
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* It transforms the mini-iterator on the IndexMap into a STL-compliant iterator.
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* Template parameters are :
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* - Const : true -> const_iterator, false -> non const version.
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* - IndexMapIterator : an IndexMapIterator
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* - StorageType : the storage.
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*/
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template <bool Const, typename IndexMapIterator, typename StorageType >
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class iterator_adapter :
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public boost::iterator_facade<
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iterator_adapter<Const,IndexMapIterator,StorageType>,
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typename details::make_const_type<Const,typename StorageType::value_type>::type,
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boost::forward_traversal_tag >
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{
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public:
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typedef typename details::make_const_type<Const,typename StorageType::value_type>::type value_type;
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typedef IndexMapIterator indexmap_iterator_type;
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iterator_adapter(): storage_(), it() {}
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iterator_adapter(const typename IndexMapIterator::indexmap_type & Ind, const StorageType & ST, bool atEnd=false):
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storage_(ST), it(Ind,atEnd) {}
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operator bool() const { return bool(it);}
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typename IndexMapIterator::indexmap_type::domain_type::index_value_type const & indices() const {return it.indices();}
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IndexMapIterator const & indexmap_iterator() const { return it;}
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private:
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friend class boost::iterator_core_access;
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void increment() { ++it; }
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value_type & dereference() const { return storage_[*it];}
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bool equal(iterator_adapter const & other) const { return (other.it == it);}
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StorageType storage_;
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IndexMapIterator it;
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};
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}}//namespace triqs::arrays
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#endif
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