dfs.cc

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2003
 *
 *  Last modified:
 *     $Date: 2008-01-19 13:19:23 +0100 (Sat, 19 Jan 2008) $ by $Author: schulte $
 *     $Revision: 5916 $
 *
 *  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
 *  "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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 */

#include "gecode/search.hh"

namespace Gecode { namespace Search {

  /*
   * Control for DFS
   *
   */

  DFS::DFS(Space* s, unsigned int c_d, unsigned int a_d, Stop* st, size_t sz)
    : e(c_d,a_d,st,sz) {
    unsigned long int p = 0;
    Space* c = (s->status(p) == SS_FAILED) ? NULL : s->clone();
    e.init(c);
    e.propagate += p;
    e.current(s);
    e.current(NULL);
    e.current(c);
    if (c == NULL)
      e.fail += 1;
  }

  Space*
  DFS::next(void) {
    return e.explore();
  }

  bool
  DFS::stopped(void) const {
    return e.stopped();
  }

  Statistics
  DFS::statistics(void) const {
    Statistics s = e;
    s.memory += e.stacksize();
    return s;
  }

}}

// STATISTICS: search-any