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eo/src/eoSteadyStateGeneration.h

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+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+//-----------------------------------------------------------------------------
+// eoSteadyStateGeneration.h
+// (c) GeNeura Team, 1998
+/* 
+    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
+ */
+//-----------------------------------------------------------------------------
+
+#ifndef eoSteadyStateGeneration_h
+#define eoSteadyStateGeneration_h
+
+//-----------------------------------------------------------------------------
+
+#include <eoAlgo.h>     // eoPop
+#include <eoEvalFunc.h> 
+#include <eoPopOps.h>  // eoSelect, eoTranform, eoMerge
+
+#include "eoGOpSelector.h"
+#include "eoIndiSelector.h"
+#include "eoSteadyStateInserter.h"
+
+//-----------------------------------------------------------------------------
+
+/** eoSteadyStateGeneration
+ * Single step of a steady state evolutionary algorithm. 
+ * Proceeds by updating one individual at a time, by first selecting parents, 
+ * creating one or more children and subsequently overwrite (a) bad individual(s)
+*/
+template<class EOT> class eoSteadyStateGeneration: public eoAlgo<EOT>
+{
+ public:
+  /// Constructor.
+  eoSteadyStateGeneration(
+      eoGOpSelector<EOT>& _opSelector, 
+      eoPopIndiSelector<EOT>& _selector,
+      eoSteadyStateInserter<EOT>& _inserter, 
+      unsigned _steps = 0) :
+            opSelector(_opSelector), 
+            selector(_selector), 
+            inserter(_inserter) , 
+            steps(_steps) {};
+
+
+  /// Apply one generation of evolution to the population.
+  virtual void operator()(eoPop<EOT>& pop) 
+  {
+      unsigned nSteps = steps;
+      if (nSteps == 0)
+      {
+          nSteps = pop.size(); // make a 'generation equivalent'
+      }
+
+      for (unsigned i = 0; i < nSteps; ++i)
+      {
+         opSelector.selectOp()(selector(pop), inserter(pop));
+      }
+
+  }
+  
+  /// Class name.
+  string className() const { return "eoSteadyStateGeneration"; }
+  
+ private:
+  eoGOpSelector<EOT>&         opSelector;
+  eoPopIndiSelector<EOT>&  selector;
+  eoSteadyStateInserter<EOT>& inserter;
+  unsigned steps;
+};
+
+//-----------------------------------------------------------------------------
+
+#endif eoGeneration_h