Changeset 4364

Timestamp:

09/03/10 13:26:02 (14 years ago)

Author:

abeham

Message:

#1179

• Added program root symbol

File:

• trunk/sources/HeuristicLab.Problems.ExternalEvaluation.GP/3.3/Grammar/FullFunctionalExpressionGrammar.cs (modified) (3 diffs)

trunk/sources/HeuristicLab.Problems.ExternalEvaluation.GP/3.3/Grammar/FullFunctionalExpressionGrammar.cs

@@ -21 +21 @@
 
 using System.Collections.Generic;
+using System.Linq;
 using HeuristicLab.Core;
 using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
@@ -39 +40 @@
 
     private void Initialize() {
+      var originalStart = StartSymbol;
+      if (!(originalStart is ProgramRootSymbol)) {
+        var root = new ProgramRootSymbol();
+        AddSymbol(root);
+        SetMinSubtreeCount(root, 1);
+        SetMaxSubtreeCount(root, 1);
+        SetAllowedChild(root, originalStart, 0);
+
+        StartSymbol = root;
+      }
+
       var add = new Addition();
       var sub = new Subtraction();
@@ -90 +102 @@
       // allow each symbol as child of the start symbol
       foreach (var symb in allSymbols) {
-        SetAllowedChild(StartSymbol, symb, 0);
+        SetAllowedChild(originalStart, symb, 0);
       }