65 lines
2.4 KiB
C
65 lines
2.4 KiB
C
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// Copyright (c) 2014
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// INRIA Saclay-Ile de France (France)
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/NewKernel_d/include/CGAL/iterator_from_indices.h $
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// $Id: iterator_from_indices.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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// Author(s) : Marc Glisse
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#ifndef CGAL_ITERATOR_FROM_INDICES_H
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#define CGAL_ITERATOR_FROM_INDICES_H
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#include <CGAL/config.h>
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#include <boost/iterator/iterator_facade.hpp>
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namespace CGAL {
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template <class Ref_>
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struct Default_coordinate_access {
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typedef Ref_ result_type;
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template<class T> Ref_ operator()(T const& t, std::ptrdiff_t i)const{
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return t[i];
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}
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};
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//TODO: default type for Value_: typename same_cv<Container_,typename remove_cv<Container_>::type::value_type>::type
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template <class Container_, class Value_, class Ref_=
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decltype(std::declval<Container_>()[0])
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, class Coord_access = Default_coordinate_access<Ref_>
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>
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class Iterator_from_indices
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: public boost::iterator_facade<Iterator_from_indices<Container_,Value_,Ref_,Coord_access>,
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Value_, std::bidirectional_iterator_tag, Ref_>
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{
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friend class boost::iterator_core_access;
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//FIXME: use int to save space
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//TODO: use a tuple to save space when Coord_access is empty
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typedef std::ptrdiff_t index_t;
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Container_* cont;
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index_t index;
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CGAL_NO_UNIQUE_ADDRESS Coord_access ca;
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void increment(){ ++index; }
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void decrement(){ --index; }
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void advance(std::ptrdiff_t n){ index+=n; }
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ptrdiff_t distance_to(Iterator_from_indices const& other)const{
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return other.index-index;
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}
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bool equal(Iterator_from_indices const& other)const{
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return index==other.index;
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}
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Ref_ dereference()const{
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//FIXME: use the functor properly
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//Uh, and what did I mean by that?
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return ca(*cont,index);
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}
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public:
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Iterator_from_indices(){}
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Iterator_from_indices(Container_& cont_,std::size_t n)
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: cont(&cont_), index(n) {}
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template<class T>
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Iterator_from_indices(Container_& cont_,std::size_t n,T const&t)
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: cont(&cont_), index(n), ca(t) {}
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};
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}
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#endif // CGAL_ITERATOR_FROM_INDICES_H
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