source: trunk/sources/HeuristicLab.Permutation/VariableStrengthSwap2Manipulator.cs @ 83

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2008 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Text;
using HeuristicLab.Core;
using HeuristicLab.Data;

namespace HeuristicLab.Permutation {
  public class VariableStrengthSwap2Manipulator : VariableStrengthPermutationManipulatorBase {
    public override string Description {
      get { return @"Swaps two randomly selected items in the permutation"; }
    }

    public static int[] Apply(IRandom random, int[] permutation) {
      int[] result = (int[])permutation.Clone();
      int index1, index2, temp;

      index1 = random.Next(result.Length);
      index2 = random.Next(result.Length);

      temp = result[index1];
      result[index1] = result[index2];
      result[index2] = temp;

      return result;
    }

    protected override int[] Manipulate(IScope scope, IRandom random, int[] permutation) {
      return Apply(random, permutation);
    }
  }
}