source: branches/HeuristicLab.EvolutionTracking/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Symbols/Passthrough.cs @ 15529

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2013 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 HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Problems.DataAnalysis.Symbolic.Symbols {
  [StorableClass]
  [Item("Passthrough", "A symbol that does not perform any operation (just passes the input). Useful for tweaking tree shape and crossover probabilities (serves as placeholder)")]
  public sealed class Passthrough : Symbol {
    private const int minimumArity = 1;
    private const int maximumArity = 1;

    public override int MinimumArity { get { return minimumArity; } }

    public override int MaximumArity { get { return maximumArity; } }

    [StorableConstructor]
    private Passthrough(bool deserializing) : base(deserializing) { }
    private Passthrough(Passthrough original, Cloner cloner) : base(original, cloner) { }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new Passthrough(this, cloner);
    }

    public Passthrough()
      : base("Passthrough", "A symbol that does not perform any operation (just passes the input). Useful for tweaking tree shape and crossover probabilities (serves as placeholder)") {
    }
  }
}