permlib 0.2.9
Library for permutation computations
vector_stabilizer_predicate.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
33#ifndef VECTORSTABILIZERPREDICATE_H_
34#define VECTORSTABILIZERPREDICATE_H_
35
36#include <permlib/predicate/subgroup_predicate.h>
37
38#include <boost/foreach.hpp>
39
40namespace permlib {
41
43template <class PERM>
45public:
47
51 template<class InputIterator>
52 VectorStabilizerPredicate(InputIterator begin, InputIterator end);
53
54 virtual bool operator()(const PERM &p) const;
55 virtual bool childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const;
56 virtual unsigned int limit() const;
57private:
58 std::vector<unsigned int> m_vec;
59};
60
61//
62// ---- IMPLEMENTATION
63//
64
65template <class PERM>
66template <class InputIterator>
67VectorStabilizerPredicate<PERM>::VectorStabilizerPredicate(InputIterator begin, InputIterator end)
68 : m_vec(begin, end)
69{ }
70
71template <class PERM>
73 for (unsigned int i = 0; i < m_vec.size(); ++i) {
74 if (m_vec[p / i] != m_vec[i])
75 return false;
76 }
77 return true;
78}
79
80template <class PERM>
81bool VectorStabilizerPredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const {
82 return (m_vec[h / beta_i] == m_vec[beta_i]);
83}
84
85template <class PERM>
87 return m_vec.size();
88}
89
90}
91
92#endif // -- VECTORSTABILIZERPREDICATE_H_
abstract base class for subgroup (and coset) predicates
Definition: subgroup_predicate.h:45
predicate for the subgroup that stabilizes a given integer vector
Definition: vector_stabilizer_predicate.h:44
virtual unsigned int limit() const
limit of recursion depth in backtrack search
Definition: vector_stabilizer_predicate.h:86
VectorStabilizerPredicate(InputIterator begin, InputIterator end)
constructor
Definition: vector_stabilizer_predicate.h:67
virtual bool operator()(const PERM &p) const
true iff group element fulfills predicate
Definition: vector_stabilizer_predicate.h:72
virtual bool childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const
checks if a given group element should not be followed in backtrack search
Definition: vector_stabilizer_predicate.h:81