permlib
0.2.6
Library for permutation computations
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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 00038 #include <boost/foreach.hpp> 00039 00040 namespace permlib { 00041 00043 template <class PERM> 00044 class SetwiseStabilizerPredicate : public SubgroupPredicate<PERM> { 00045 public: 00047 00051 template<class InputIterator> 00052 SetwiseStabilizerPredicate(InputIterator begin, InputIterator end); 00053 00054 virtual bool operator()(const PERM &p) const; 00055 virtual bool childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const; 00056 virtual unsigned int limit() const; 00057 private: 00058 //TODO: perhaps use std::set here? 00059 std::vector<unsigned long> m_delta; 00060 }; 00061 00062 // 00063 // ---- IMPLEMENTATION 00064 // 00065 00066 template <class PERM> 00067 template <class InputIterator> 00068 SetwiseStabilizerPredicate<PERM>::SetwiseStabilizerPredicate(InputIterator begin, InputIterator end) 00069 : m_delta(begin, end) 00070 { } 00071 00072 template <class PERM> 00073 bool SetwiseStabilizerPredicate<PERM>::operator()(const PERM &p) const { 00074 BOOST_FOREACH(unsigned long delta_i, m_delta) { 00075 if (std::find(m_delta.begin(), m_delta.end(), p / delta_i) == m_delta.end()) 00076 return false; 00077 } 00078 return true; 00079 } 00080 00081 template <class PERM> 00082 bool SetwiseStabilizerPredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const { 00083 if (std::find(m_delta.begin(), m_delta.end(), h / beta_i) == m_delta.end()) 00084 return false; 00085 return true; 00086 } 00087 00088 template <class PERM> 00089 unsigned int SetwiseStabilizerPredicate<PERM>::limit() const { 00090 return m_delta.size(); 00091 } 00092 00093 } 00094 00095 #endif // -- SETWISESTABILIZERPREDICATE_H_