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pointer_iterator.hh
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1 //------------------------------------------------------------------------------
2 // This file is part of the OpenStructure project <www.openstructure.org>
3 //
4 // Copyright (C) 2008-2020 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_MOL_IMPL_POINTER_ITERATOR_HH
20 #define OST_MOL_IMPL_POINTER_ITERATOR_HH
21 
22 #include <vector>
23 
24 namespace ost { namespace mol { namespace impl {
25 
26 template <typename T>
27 class pointer_it {
28 
29  using iterator_category = std::forward_iterator_tag;
30  using value_type = T;
31  using difference_type = std::ptrdiff_t;
32  using pointer = T*;
33  using reference = T&;
34 
35 public:
36  pointer_it(T* s): s_(s) { }
37 
39  {
40  ++s_;
41  return *this;
42  }
44  {
45  s_+=rhs;
46  return *this;
47  }
48 
49  bool operator==(const pointer_it<T>& rhs) const
50  {
51  return rhs.s_==s_;
52  }
53 
54  bool operator!=(const pointer_it<T>&rhs) const
55  {
56  return !(*this==rhs);
57  }
58 
59  T& operator*()
60  {
61  return *s_;
62  }
63 
65  {
66  return s_;
67  }
68 private:
69  T* s_;
70 };
71 
72 template <typename T>
73 inline pointer_it<T> begin(const std::vector<T>& values)
74 {
75  return pointer_it<T>(values.empty() ? NULL : const_cast<T*>(&values.front()));
76 }
77 
78 template <typename T>
79 inline pointer_it<T> end(const std::vector<T>& values)
80 {
81  return pointer_it<T>(values.empty() ? NULL : const_cast<T*>(&values.back()+1));
82 }
83 
84 }}}
85 
86 #endif
bool operator==(const pointer_it< T > &rhs) const
pointer_it< T > end(const std::vector< T > &values)
pointer_it< T > & operator+(int rhs)
pointer_it< T > begin(const std::vector< T > &values)
pointer_it< T > & operator++()
bool operator!=(const pointer_it< T > &rhs) const