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 VECTORSTABILIZERPREDICATE_H_ 00034 #define VECTORSTABILIZERPREDICATE_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 VectorStabilizerPredicate : public SubgroupPredicate<PERM> { 00045 public: 00047 00051 template<class InputIterator> 00052 VectorStabilizerPredicate(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 std::vector<unsigned int> m_vec; 00059 }; 00060 00061 // 00062 // ---- IMPLEMENTATION 00063 // 00064 00065 template <class PERM> 00066 template <class InputIterator> 00067 VectorStabilizerPredicate<PERM>::VectorStabilizerPredicate(InputIterator begin, InputIterator end) 00068 : m_vec(begin, end) 00069 { } 00070 00071 template <class PERM> 00072 bool VectorStabilizerPredicate<PERM>::operator()(const PERM &p) const { 00073 for (unsigned int i = 0; i < m_vec.size(); ++i) { 00074 if (m_vec[p / i] != m_vec[i]) 00075 return false; 00076 } 00077 return true; 00078 } 00079 00080 template <class PERM> 00081 bool VectorStabilizerPredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const { 00082 return (m_vec[h / beta_i] == m_vec[beta_i]); 00083 } 00084 00085 template <class PERM> 00086 unsigned int VectorStabilizerPredicate<PERM>::limit() const { 00087 return m_vec.size(); 00088 } 00089 00090 } 00091 00092 #endif // -- VECTORSTABILIZERPREDICATE_H_