permlib  0.2.9
Library for permutation computations
dset.h
1 // ---------------------------------------------------------------------------
2 //
3 // This file is part of PermLib.
4 //
5 // Copyright (c) 2009-2011 Thomas Rehn <thomas@carmen76.de>
6 // All rights reserved.
7 //
8 // Redistribution and use in source and binary forms, with or without
9 // modification, are permitted provided that the following conditions
10 // are met:
11 // 1. Redistributions of source code must retain the above copyright
12 // notice, this list of conditions and the following disclaimer.
13 // 2. Redistributions in binary form must reproduce the above copyright
14 // notice, this list of conditions and the following disclaimer in the
15 // documentation and/or other materials provided with the distribution.
16 // 3. The name of the author may not be used to endorse or promote products
17 // derived from this software without specific prior written permission.
18 //
19 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 // IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 // NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 //
30 // ---------------------------------------------------------------------------
31 
32 #ifndef DSET_H_
33 #define DSET_H_
34 
35 #include <boost/dynamic_bitset.hpp>
36 
37 namespace permlib {
38 
40 typedef boost::dynamic_bitset<> dset;
41 
43 template<class PERM>
44 struct DSetAction {
45  DSetAction(unsigned long size) : m_tmp(size) {}
46 
48  dset operator()(const PERM &p, const dset& v) {
49  apply(p, v, m_tmp);
50  return m_tmp;
51  }
52 
53  // apply permutation in-place
54  void apply(const PERM &p, const dset& v, dset& tmp) {
55  tmp.reset();
56  for (unsigned int i = 0; i < tmp.size(); ++i) {
57  if (v[i])
58  tmp.set(p / i, 1);
59  }
60  }
61 private:
63  dset m_tmp;
64 };
65 
66 
67 } // ns permlib
68 #endif // DSET_H_
action of a permutation on a dynamic bitset
Definition: dset.h:44
dset operator()(const PERM &p, const dset &v)
default action operator as also used in Transversal<PERM>::TrivialAction
Definition: dset.h:48
Definition: abstract_bsgs.h:49