Well, what do you know, major commit.

Changed the signature of eoMon, eoBin and eoQuadOp to return a bool,
without invalidating fitness. Added a set of invalidators to take over
that job (see for instance eoSGA and eoSGATransform how this can transparantly used)

Derived eoState from eoFunctorStore (for convenience, from a design perspective this may sound wrong)

Added a wrap_op function that does the wrapping for you (see eoOpContainer how this made this functor
exceedingly less hairy). Checked all the tests removed the eoGeneric*Op family (not needed anymore)
and of course changed all the operators to reflect the change (and found a few that didn't
invalidate the fitness, thus really pointing out the advantage of the current approach)

eo/src/eoInvalidateOps.h

@@ -0,0 +1,118 @@
+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+//-----------------------------------------------------------------------------
+// eoInvalidateOps.h
+// (c) Maarten Keijzer 2001
+/*
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Contact: todos@geneura.ugr.es, http://geneura.ugr.es
+             Marc.Schoenauer@polytechnique.fr
+             mak@dhi.dk
+ */
+//-----------------------------------------------------------------------------
+
+#ifndef _eoInvalidateOps_h
+#define _eoInvalidateOps_h
+
+#include <eoOp.h>
+
+/**
+One of the invalidator operators. Use this one as a 'hat' on an operator
+that is defined to work on a generic datatype. This functor will then check
+the return type of the operator and invalidate the fitness of the individual.
+
+This functor is used in algorithms that work with straight eoMonOp, eoBinOp
+or eoQuadOp operators, for instance eoSGA. Note that eoGenOp derived operators
+generally do invalidate the fitness of the objects they have changed.
+*/
+
+template <class EOT>
+class eoInvalidateMonOp : public eoMonOp<EOT>
+{
+  public:
+    eoInvalidateMonOp(eoMonOp<EOT>& _op) : op(_op) {}
+
+    bool operator()(EOT& _eo)
+    {
+      if (op(_eo))
+        _eo.invalidate();
+
+      return false; // we did change the thing, but it is already invalidated
+    }
+
+  private:
+    eoMonOp<EOT>& op;
+};
+
+/**
+One of the invalidator operators. Use this one as a 'hat' on an operator
+that is defined to work on a generic datatype. This functor will then check
+the return type of the operator and invalidate the fitness of the individual.
+
+This functor is used in algorithms that work with straight eoMonOp, eoBinOp
+or eoQuadOp operators, for instance eoSGA. Note that eoGenOp derived operators
+generally do invalidate the fitness of the objects they have changed.
+*/
+
+template <class EOT>
+class eoInvalidateBinOp : public eoBinOp<EOT>
+{
+  public:
+    eoInvalidateBinOp(eoBinOp<EOT>& _op) : op(_op) {}
+
+    bool operator()(EOT& _eo, const EOT& _eo2)
+    {
+      if (op(_eo, _eo2))
+        _eo.invalidate();
+
+      return false; // we did change the thing, but it is already invalidated
+    }
+
+  private:
+    eoBinOp<EOT>& op;
+};
+
+/**
+One of the invalidator operators. Use this one as a 'hat' on an operator
+that is defined to work on a generic datatype. This functor will then check
+the return type of the operator and invalidate the fitness of the individual.
+
+This functor is used in algorithms that work with straight eoMonOp, eoBinOp
+or eoQuadOp operators, for instance eoSGA. Note that eoGenOp derived operators
+generally do invalidate the fitness of the objects they have changed.
+*/
+
+template <class EOT>
+class eoInvalidateQuadOp : public eoQuadOp<EOT>
+{
+  public:
+    eoInvalidateQuadOp(eoQuadOp<EOT>& _op) : op(_op) {}
+
+    bool operator()(EOT& _eo1, EOT& _eo2)
+    {
+      if (op(_eo1, _eo2))
+      {
+        _eo1.invalidate();
+        _eo2.invalidate();
+      }
+      return false; // we did change the thing, but it is already invalidated
+    }
+
+  private:
+    eoQuadOp<EOT>& op;
+};
+
+#endif