partial_mapped_xover.cpp

// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-

// "partial_mapped_xover.cpp"

// (c) OPAC Team, LIFL, 2003-2006

/* TEXT LICENCE
   
   Contact: paradiseo-help@lists.gforge.inria.fr
*/

#include <assert.h>

#include <vector>

#include <utils/eoRNG.h>

#include "partial_mapped_xover.h"
#include "route_valid.h"
#include "mix.h"

void PartialMappedXover :: repair (Route & __route, unsigned __cut1, unsigned __cut2) 
{
  
  std::vector<unsigned int> v; // Number of times a cities are visited ...
  
  v.resize(__route.size ()); 
  
  for (unsigned int i = 0 ; i < __route.size () ; i ++)
    {
      v [i] = 0 ;
    }
  
  for (unsigned int i = 0 ; i < __route.size () ; i ++)
    {
      v [__route [i]] ++ ;
    }
  
  std :: vector <unsigned int> vert ;

  for (unsigned int i = 0 ; i < __route.size () ; i ++)
    {
      if (! v [i])
        {
          vert.push_back (i) ;
        }
    }
  
  mix (vert) ;

  for (unsigned int i = 0 ; i < __route.size () ; i ++)
    {
      if (i < __cut1 || i >= __cut2)
        {
          if (v [__route [i]] > 1) 
            {
              __route [i] = vert.back () ;
              vert.pop_back () ;
            }
        }
   }

  v.clear();
}

bool PartialMappedXover :: operator () (Route & __route1, Route & __route2) 
{
  unsigned int cut1 = rng.random (__route1.size ()), cut2 = rng.random (__route2.size ()) ;
  
  if (cut2 < cut1)
    {
      std :: swap (cut1, cut2) ;
    }
  
  // Between the cuts
  for (unsigned int i = cut1 ; i < cut2 ; i ++)
    {
      std :: swap (__route1 [i], __route2 [i]) ;
    }
  
  // Outside the cuts
  repair (__route1, cut1, cut2) ;
  repair (__route2, cut1, cut2) ;
  
  // Debug
  assert (valid (__route1)) ;
  assert (valid (__route2)) ;

  __route1.invalidate () ;
  __route2.invalidate () ;

  return true ;
}

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