text: /*
   *  Authors:
   *    Christian Schulte <schulte@gecode.org>
   *
   *  Copyright:
   *    Christian Schulte, 2008-2012
   *
   *  Permission is hereby granted, free of charge, to any person obtaining
   *  a copy of this 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,
   *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
   *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
   *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
   *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   */
  
  #include <gecode/kernel.hh>
  
  using namespace Gecode;
  
  void bab(Space* s, unsigned int& n, Space*& b) {
    switch (s->status()) {
    case SS_FAILED:
      delete s;
      break;
    case SS_SOLVED:
      // solved
      n++;
      delete b; 
      (void) s->choice(); b = s->clone(); delete s;
      break;
    case SS_BRANCH:
      {
        const Choice* ch = s->choice();
        Space* c = s->clone();
        // remember number of solutions
        unsigned int m=n;
        // explore first alternative
        s->commit(*ch,0);
        bab(s,n,b);
        // constrain clone
        if (n > m)
          c->constrain(*b);
        // explore second alternative
        c->commit(*ch,1);
        bab(c,n,b);
        delete ch;
      }
      break;
    }
  }
  
  Space* bab(Space* s) {
    unsigned int n = 0; Space* b = NULL;
    bab(s,n,b);
    return b;
  }
  