Added mathsym+tcc and boost against all advice

eo/contrib/mathsym/gen/TreeBuilder.h

@@ -0,0 +1,45 @@
+/*	    
+ *             Copyright (C) 2005 Maarten Keijzer
+ *
+ *          This program is free software; you can redistribute it and/or modify
+ *          it under the terms of version 2 of the GNU General Public License as 
+ *          published by the Free Software Foundation. 
+ *
+ *          This program 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 this program; if not, write to the Free Software
+ *          Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef TREEBUILDER_H_
+#define TREEBUILDER_H_
+
+#include "Sym.h"
+#include "LanguageTable.h"
+
+class TreeBuilder {
+    const LanguageTable& table;
+
+    // probability of selecting a var versus a const when the choice boils down to selecting a terminal
+    double vcprob;
+    
+    Sym make_terminal() const;
+    public:
+
+    TreeBuilder(const LanguageTable& t) : table(t), vcprob(0.9) {};
+    TreeBuilder(const LanguageTable& t, double vc) : table(t), vcprob(vc) {};
+    
+    void set_var_vs_const_probability(double p) { vcprob = p; }
+    
+    Sym build_tree(unsigned max_depth, bool grow) const;
+
+    void build_tree(Sym& tree, unsigned max_depth, bool grow) const { tree = build_tree(max_depth, grow); }
+    
+};
+
+#endif
+