permlib 0.2.9
Library for permutation computations
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setwise_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.
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31
32
33#ifndef SETWISESTABILIZERPREDICATE_H_
34#define SETWISESTABILIZERPREDICATE_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 SetwiseStabilizerPredicate(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 //TODO: perhaps use std::set here?
59 std::vector<unsigned long> m_delta;
60};
61
62//
63// ---- IMPLEMENTATION
64//
65
66template <class PERM>
67template <class InputIterator>
69 : m_delta(begin, end)
70{ }
71
72template <class PERM>
74 BOOST_FOREACH(unsigned long delta_i, m_delta) {
75 if (std::find(m_delta.begin(), m_delta.end(), p / delta_i) == m_delta.end())
76 return false;
77 }
78 return true;
79}
80
81template <class PERM>
82bool SetwiseStabilizerPredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const {
83 if (std::find(m_delta.begin(), m_delta.end(), h / beta_i) == m_delta.end())
84 return false;
85 return true;
86}
87
88template <class PERM>
90 return m_delta.size();
91}
92
93}
94
95#endif // -- SETWISESTABILIZERPREDICATE_H_
virtual bool operator()(const PERM &p) const
true iff group element fulfills predicate
Definition setwise_stabilizer_predicate.h:73
SetwiseStabilizerPredicate(InputIterator begin, InputIterator end)
constructor
Definition setwise_stabilizer_predicate.h:68
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 setwise_stabilizer_predicate.h:82
virtual unsigned int limit() const
limit of recursion depth in backtrack search
Definition setwise_stabilizer_predicate.h:89
abstract base class for subgroup (and coset) predicates
Definition subgroup_predicate.h:45