permlib  0.2.9
Library for permutation computations
setwise_stabilizer_predicate.h
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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 
40 namespace permlib {
41 
43 template <class PERM>
45 public:
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;
57 private:
58  //TODO: perhaps use std::set here?
59  std::vector<unsigned long> m_delta;
60 };
61 
62 //
63 // ---- IMPLEMENTATION
64 //
65 
66 template <class PERM>
67 template <class InputIterator>
68 SetwiseStabilizerPredicate<PERM>::SetwiseStabilizerPredicate(InputIterator begin, InputIterator end)
69  : m_delta(begin, end)
70 { }
71 
72 template <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 
81 template <class PERM>
82 bool 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 
88 template <class PERM>
90  return m_delta.size();
91 }
92 
93 }
94 
95 #endif // -- SETWISESTABILIZERPREDICATE_H_
virtual unsigned int limit() const
limit of recursion depth in backtrack search
Definition: setwise_stabilizer_predicate.h:89
predicate for the subgroup that stabilizes a given point set
Definition: setwise_stabilizer_predicate.h:44
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 bool operator()(const PERM &p) const
true iff group element fulfills predicate
Definition: setwise_stabilizer_predicate.h:73
abstract base class for subgroup (and coset) predicates
Definition: subgroup_predicate.h:45
Definition: abstract_bsgs.h:49