1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
// Copyright (c) 2014
// INRIA Saclay-Ile de France (France)
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1.1/NewKernel_d/include/CGAL/iterator_from_indices.h $
// $Id: include/CGAL/iterator_from_indices.h 08b27d3db14 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Marc Glisse
#ifndef CGAL_ITERATOR_FROM_INDICES_H
#define CGAL_ITERATOR_FROM_INDICES_H
#include <CGAL/config.h>
#include <boost/iterator/iterator_facade.hpp>
namespace CGAL {
template <class Ref_>
struct Default_coordinate_access {
typedef Ref_ result_type;
template<class T> Ref_ operator()(T const& t, std::ptrdiff_t i)const{
return t[i];
}
};
//TODO: default type for Value_: typename same_cv<Container_,typename remove_cv<Container_>::type::value_type>::type
template <class Container_, class Value_, class Ref_=
decltype(std::declval<Container_>()[0])
, class Coord_access = Default_coordinate_access<Ref_>
>
class Iterator_from_indices
: public boost::iterator_facade<Iterator_from_indices<Container_,Value_,Ref_,Coord_access>,
Value_, std::bidirectional_iterator_tag, Ref_>
{
friend class boost::iterator_core_access;
//FIXME: use int to save space
//TODO: use a tuple to save space when Coord_access is empty
typedef std::ptrdiff_t index_t;
Container_* cont;
index_t index;
CGAL_NO_UNIQUE_ADDRESS Coord_access ca;
void increment(){ ++index; }
void decrement(){ --index; }
void advance(std::ptrdiff_t n){ index+=n; }
ptrdiff_t distance_to(Iterator_from_indices const& other)const{
return other.index-index;
}
bool equal(Iterator_from_indices const& other)const{
return index==other.index;
}
Ref_ dereference()const{
//FIXME: use the functor properly
//Uh, and what did I mean by that?
return ca(*cont,index);
}
public:
Iterator_from_indices(){}
Iterator_from_indices(Container_& cont_,std::size_t n)
: cont(&cont_), index(n) {}
template<class T>
Iterator_from_indices(Container_& cont_,std::size_t n,T const&t)
: cont(&cont_), index(n), ca(t) {}
};
}
#endif // CGAL_ITERATOR_FROM_INDICES_H
|
