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sequence_list_iterator.hh
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1 //------------------------------------------------------------------------------
2 // This file is part of the OpenStructure project <www.openstructure.org>
3 //
4 // Copyright (C) 2008-2011 by the OpenStructure authors
5 //
6 // This library is free software; you can redistribute it and/or modify it under
7 // the terms of the GNU Lesser General Public License as published by the Free
8 // Software Foundation; either version 3.0 of the License, or (at your option)
9 // any later version.
10 // This library is distributed in the hope that it will be useful, but WITHOUT
11 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
12 // FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
13 // details.
14 //
15 // You should have received a copy of the GNU Lesser General Public License
16 // along with this library; if not, write to the Free Software Foundation, Inc.,
17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 //------------------------------------------------------------------------------
19 #ifndef OST_SEQ_IMPL_SEQUENCE_LIST_ITERATOR_HH
20 #define OST_SEQ_IMPL_SEQUENCE_LIST_ITERATOR_HH
21 
22 /*
23  Author: Marco Biasini
24  */
25 
26 #include <ost/seq/module_config.hh>
27 namespace ost { namespace seq { namespace impl {
28 
30 template <typename T, typename I>
31 class TEMPLATE_EXPORT SequenceListIterator
32  : public std::iterator<std::random_access_iterator_tag, T>{
33 public:
34  typedef T ValueType;
35  typedef I IteratorType;
37 protected:
38  void UpdateVal()
39  {
40  if (current_it_<end_) {
41  current_val_=ValueType(*current_it_);
42  }
43  }
44 public:
46  current_it_(it), end_(end)
47  {
48  this->UpdateVal();
49  }
50 
52  {
53  return current_val_;
54  }
55 
56  ValueType* operator->()
57  {
58  return &current_val_;
59  }
60 
62  ++current_it_;
63  this->UpdateVal();
64  return *this;
65  }
66 
68  current_it_+=n;
69  this->UpdateVal();
70  return *this;
71  }
73  ClassType ans(current_it_, end_);
74  ans+=n;
75  return *this;
76  }
78  current_it_-=n;
79  this->UpdateVal();
80  return *this;
81  }
82 
84  ClassType ans(*this);
85  ++current_it_;
86  this->UpdateVal();
87  return ans;
88  }
89 
90  bool operator==(const ClassType& rhs) const
91  {
92  return current_it_==rhs.current_it_;
93  }
94 
95  bool operator!=(const ClassType& rhs) const
96  {
97  return !(*this==rhs);
98  }
99 private:
100  IteratorType current_it_;
101  IteratorType end_;
102  ValueType current_val_;
103 };
104 
105 }}}
106 
107 #endif