PermLib

setwise_stabilizer_predicate.h

00001 // ---------------------------------------------------------------------------
00002 //
00003 //  This file is part of PermLib.
00004 //
00005 // Copyright (c) 2009-2011 Thomas Rehn <thomas@carmen76.de>
00006 // All rights reserved.
00007 // 
00008 // Redistribution and use in source and binary forms, with or without
00009 // modification, are permitted provided that the following conditions
00010 // are met:
00011 // 1. Redistributions of source code must retain the above copyright
00012 //    notice, this list of conditions and the following disclaimer.
00013 // 2. Redistributions in binary form must reproduce the above copyright
00014 //    notice, this list of conditions and the following disclaimer in the
00015 //    documentation and/or other materials provided with the distribution.
00016 // 3. The name of the author may not be used to endorse or promote products
00017 //    derived from this software without specific prior written permission.
00018 // 
00019 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00020 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00021 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00022 // IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
00023 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
00024 // NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00025 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00026 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00027 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
00028 // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00029 //
00030 // ---------------------------------------------------------------------------
00031 
00032 
00033 #ifndef SETWISESTABILIZERPREDICATE_H_
00034 #define SETWISESTABILIZERPREDICATE_H_
00035 
00036 #include <permlib/predicate/subgroup_predicate.h>
00037 #include <permlib/search/partition/set_stabilize_refinement.h>
00038 #include <permlib/search/partition/refinement_family.h>
00039 
00040 #include <boost/foreach.hpp>
00041 
00042 namespace permlib {
00043 
00045 template <class PERM>
00046 class SetwiseStabilizerPredicate : public SubgroupPredicate<PERM> {
00047 public:
00049 
00053         template<class InputIterator>
00054         SetwiseStabilizerPredicate(InputIterator begin, InputIterator end);
00055 
00056         virtual bool operator()(const PERM &p) const;
00057         virtual bool childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const;
00058         virtual unsigned int limit() const;
00059 private:
00060         //TODO: perhaps use std::set here?
00061         std::vector<unsigned long> m_delta;
00062 };
00063 
00064 //
00065 //     ----       IMPLEMENTATION
00066 //
00067 
00068 template <class PERM>
00069 template <class InputIterator>
00070 SetwiseStabilizerPredicate<PERM>::SetwiseStabilizerPredicate(InputIterator begin, InputIterator end) 
00071         : m_delta(begin, end)
00072 { }
00073 
00074 template <class PERM>
00075 bool SetwiseStabilizerPredicate<PERM>::operator()(const PERM &p) const {
00076         BOOST_FOREACH(unsigned long delta_i, m_delta) {
00077                 if (std::find(m_delta.begin(), m_delta.end(), p / delta_i) == m_delta.end())
00078                         return false;
00079         }
00080         return true;
00081 }
00082 
00083 template <class PERM>
00084 bool SetwiseStabilizerPredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const {
00085         if (std::find(m_delta.begin(), m_delta.end(), h / beta_i) == m_delta.end())
00086                 return false;
00087         return true;
00088 }
00089 
00090 template <class PERM>
00091 unsigned int SetwiseStabilizerPredicate<PERM>::limit() const {
00092         return m_delta.size();
00093 }
00094 
00095 }
00096 
00097 #endif // -- SETWISESTABILIZERPREDICATE_H_