permlib 0.2.9
Library for permutation computations
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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.
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24// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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29//
30// ---------------------------------------------------------------------------
31
32#ifndef DSET_H_
33#define DSET_H_
34
35#include <boost/dynamic_bitset.hpp>
36
37namespace permlib {
38
40typedef boost::dynamic_bitset<> dset;
41
43template<class PERM>
44struct 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 }
61private:
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