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source: branches/3.1/sources/HeuristicLab.Functions/Subtraction.cs @ 4075

Last change on this file since 4075 was 434, checked in by gkronber, 16 years ago

added creation of empty SubOperatorTypeConstraints for each input of each function (#163)

File size: 1.8 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using System.Text;
25using HeuristicLab.Core;
26using System.Diagnostics;
27using HeuristicLab.Constraints;
28using System.Linq;
29using HeuristicLab.DataAnalysis;
30
31namespace HeuristicLab.Functions {
32  public sealed class Subtraction : FunctionBase {
33    public override string Description {
34      get {
35        return @"Subtracts the results of sub-tree 2..n from the result of the first sub-tree.
36    (- 3) => -3
37    (- 2 3) => -1
38    (- 3 4 5) => -6";
39      }
40    }
41
42    public Subtraction()
43      : base() {
44      // 2 - 3 seems like an reasonable defaut (used for +,-,*,/) (discussion with swinkler and maffenze)
45      AddConstraint(new NumberOfSubOperatorsConstraint(2, 3));
46      AddConstraint(new SubOperatorTypeConstraint(0));
47      AddConstraint(new SubOperatorTypeConstraint(1));
48      AddConstraint(new SubOperatorTypeConstraint(2));
49    }
50
51    public override void Accept(IFunctionVisitor visitor) {
52      visitor.Visit(this);
53    }
54  }
55}
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