NS-3 based Named Data Networking (NDN) simulator
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multi-policy-container.h
1 /* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2011 University of California, Los Angeles
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation;
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  *
18  * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
19  */
20 
21 #ifndef MULTI_POLICY_CONTAINER_H_
22 #define MULTI_POLICY_CONTAINER_H_
23 
24 #include <boost/mpl/inherit_linearly.hpp>
25 #include <boost/mpl/at.hpp>
26 
27 namespace ns3 {
28 namespace ndn {
29 namespace ndnSIM {
30 namespace detail {
31 
32 template< class Base, class Value >
34 {
35  policy_wrap (Base &base) : value_ (base) { }
36  Value value_;
37 };
38 
39 template< class Base, class Super/*empy_wrap/previous level*/, class Value/*policy_wrap< element in vector >*/ >
40 struct inherit_with_base : Super, Value
41 {
42  inherit_with_base (Base &base) : Super (base), Value (base) { }
43 
44  void
45  update (typename Base::iterator item)
46  {
47  Value::value_.update (item);
48  Super::update (item);
49  }
50 
51  bool
52  insert (typename Base::iterator item)
53  {
54  bool ok = Value::value_.insert (item);
55  if (!ok)
56  return false;
57 
58  ok = Super::insert (item);
59  if (!ok)
60  {
61  Value::value_.erase (item);
62  return false;
63  }
64  return true;
65  }
66 
67  void
68  lookup (typename Base::iterator item)
69  {
70  Value::value_.lookup (item);
71  Super::lookup (item);
72  }
73 
74  void
75  erase (typename Base::iterator item)
76  {
77  Value::value_.erase (item);
78  Super::erase (item);
79  }
80 
81  void
82  clear ()
83  {
84  Value::value_.clear ();
85  Super::clear ();
86  }
87 };
88 
89 template< class Base >
91 {
92  empty_policy_wrap (Base &base) { }
93 
94  void update (typename Base::iterator item) {}
95  bool insert (typename Base::iterator item) { return true; }
96  void lookup (typename Base::iterator item) {}
97  void erase (typename Base::iterator item) {}
98  void clear () {}
99 };
100 
101 template< class Base, class Vector >
103  : public boost::mpl::fold< Vector,
104  empty_policy_wrap<Base>,
105  inherit_with_base<Base,
106  boost::mpl::_1/*empty/previous*/,
107  policy_wrap<Base, boost::mpl::_2>/*element in vector*/>
108  >::type
109 {
110  typedef typename boost::mpl::fold< Vector,
112  inherit_with_base<Base,
113  boost::mpl::_1/*empty/previous*/,
114  policy_wrap<Base, boost::mpl::_2>/*element in vector*/>
115  >::type super;
116 
117  typedef typename boost::mpl::at_c<Vector, 0>::type::iterator iterator;
118  typedef typename boost::mpl::at_c<Vector, 0>::type::const_iterator const_iterator;
119 
120  iterator begin () { return this->get<0> ().begin (); }
121  const_iterator begin () const { return this->get<0> ().begin (); }
122 
123  iterator end () { return this->get<0> ().end (); }
124  const_iterator end () const { return this->get<0> ().end (); }
125 
126  size_t size () const { return this->get<0> ().size (); }
127 
128  multi_policy_container (Base &base)
129  : super (base)
130  { }
131 
132  template<int N>
133  struct index
134  {
135  typedef typename boost::mpl::at_c<Vector, N>::type type;
136  };
137 
138  template<class T>
139  T &
140  get ()
141  {
142  return static_cast< policy_wrap<Base, T> &> (*this).value_;
143  }
144 
145  template<class T>
146  const T &
147  get () const
148  {
149  return static_cast< const policy_wrap<Base, T> &> (*this).value_;
150  }
151 
152  template<int N>
153  typename boost::mpl::at_c<Vector, N>::type &
154  get ()
155  {
156  typedef typename boost::mpl::at_c<Vector, N>::type T;
157  return static_cast< policy_wrap<Base, T> &> (*this).value_;
158  }
159 
160  template<int N>
161  const typename boost::mpl::at_c<Vector, N>::type &
162  get () const
163  {
164  typedef typename boost::mpl::at_c<Vector, N>::type T;
165  return static_cast< const policy_wrap<Base, T> &> (*this).value_;
166  }
167 };
168 
169 
170 } // detail
171 } // ndnSIM
172 } // ndn
173 } // ns3
174 
175 #endif // MULTI_POLICY_CONTAINER_H_