brancher-filter.hpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2017
 *
 *  Last modified:
 *     $Date: 2017-04-01 20:27:10 +0200 (Sat, 01 Apr 2017) $ by $Author: schulte $
 *     $Revision: 15623 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
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 *  permit persons to whom the Software is furnished to do so, subject to
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 */

#include <functional>

namespace Gecode {

  template<class Var>
  using BranchFilter = std::function<bool(const Space& home, 
                                          Var x, int i)>;
 
  template<class View>
  class BrancherFilter {
  public:
    typedef typename View::VarType Var;
  protected:
    SharedData<BranchFilter<Var>> f;
  public:
    BrancherFilter(BranchFilter<Var> bf);
    BrancherFilter(Space& home, bool shared, BrancherFilter& bf);
    operator bool(void) const;
    bool operator ()(const Space& home, View x, int i) const;
    bool notice(void) const;
    void dispose(Space& home);
  };

  template<class View>
  class BrancherNoFilter {
  public:
    typedef typename View::VarType Var;
  public:
    BrancherNoFilter(BranchFilter<Var> bf);
    BrancherNoFilter(Space& home, bool shared, BrancherNoFilter& bf);
    operator bool(void) const;
    bool operator ()(const Space& home, View x, int i) const;
    bool notice(void) const;
    void dispose(Space& home);
  };


  template<class View>
  forceinline
  BrancherFilter<View>::BrancherFilter(BranchFilter<Var> bf) : f(bf) {
    if (!bf)
      throw Gecode::InvalidFunction("BrancherFilter::BrancherFilter");
  }
  
  template<class View>
  forceinline
  BrancherFilter<View>::BrancherFilter(Space& home, bool shared,
                                       BrancherFilter<View>& bf) {
    f.update(home,shared,bf.f);
  }

  template<class View>
  forceinline
  BrancherFilter<View>::operator bool(void) const {
    return true;
  }

  template<class View>
  forceinline bool
  BrancherFilter<View>::operator ()(const Space& home, View x, int i) const {
    GECODE_VALID_FUNCTION(f());
    Var xv(x.varimp());
    return f()(home,xv,i);
  }

  template<class View>
  forceinline bool
  BrancherFilter<View>::notice(void) const {
    return true;
  }

  template<class View>
  forceinline void
  BrancherFilter<View>::dispose(Space&) {
    f.~SharedData<BranchFilter<Var>>();
  }


  template<class View>
  forceinline
  BrancherNoFilter<View>::BrancherNoFilter(BranchFilter<Var> bf) {
    assert(!bf);
  }
  
  template<class View>
  forceinline
  BrancherNoFilter<View>::BrancherNoFilter(Space&, bool,
                                           BrancherNoFilter<View>&) {}

  template<class View>
  forceinline
  BrancherNoFilter<View>::operator bool(void) const {
    return false;
  }

  template<class View>
  forceinline bool
  BrancherNoFilter<View>::operator ()(const Space&, View, int) const {
    return true;
  }
  template<class View>
  forceinline bool
  BrancherNoFilter<View>::notice(void) const {
    return false;
  }

  template<class View>
  forceinline void
  BrancherNoFilter<View>::dispose(Space&) {
  }

}

// STATISTICS: kernel-branch