permlib  0.2.6
Library for permutation computations
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include/permlib/predicate/set_image_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,
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00025 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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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_