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 SETIMAGEPREDICATE_H_ 00034 #define SETIMAGEPREDICATE_H_ 00035 00036 #include <permlib/predicate/subgroup_predicate.h> 00037 00038 #include <boost/foreach.hpp> 00039 00040 namespace permlib { 00041 00043 00046 template <class PERM> 00047 class SetImagePredicate : public SubgroupPredicate<PERM> { 00048 public: 00050 00056 template<class InputIterator> 00057 SetImagePredicate(InputIterator deltaBegin, InputIterator deltaEnd, InputIterator gammaBegin, InputIterator gammaEnd); 00058 00059 virtual bool operator()(const PERM &p) const; 00060 virtual bool childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const; 00061 virtual unsigned int limit() const; 00062 private: 00063 //TODO: perhaps use std::set here? 00064 std::vector<unsigned long> m_delta; 00065 std::vector<unsigned long> m_gamma; 00066 }; 00067 00068 // 00069 // ---- IMPLEMENTATION 00070 // 00071 00072 template <class PERM> 00073 template<class InputIterator> 00074 SetImagePredicate<PERM>::SetImagePredicate(InputIterator deltaBegin, InputIterator deltaEnd, InputIterator gammaBegin, InputIterator gammaEnd) 00075 : m_delta(deltaBegin, deltaEnd), m_gamma(gammaBegin, gammaEnd) 00076 { 00077 BOOST_ASSERT(m_delta.size() == m_gamma.size()); 00078 } 00079 00080 00081 template <class PERM> 00082 bool SetImagePredicate<PERM>::operator()(const PERM &p) const { 00083 BOOST_FOREACH(unsigned long delta_i, m_delta) { 00084 if (std::find(m_gamma.begin(), m_gamma.end(), p / delta_i) == m_gamma.end()) 00085 return false; 00086 } 00087 return true; 00088 } 00089 00090 template <class PERM> 00091 bool SetImagePredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const { 00092 if (std::find(m_gamma.begin(), m_gamma.end(), h / beta_i) == m_gamma.end()) 00093 return false; 00094 return true; 00095 } 00096 00097 template <class PERM> 00098 unsigned int SetImagePredicate<PERM>::limit() const { 00099 return m_delta.size(); 00100 } 00101 00102 } 00103 00104 #endif // -- SETIMAGEPREDICATE_H_