eo/src/eoMutation.h

@@ -0,0 +1,116 @@
+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+//-----------------------------------------------------------------------------
+// eoMutation.h
+// (c) GeNeura Team, 1998
+//-----------------------------------------------------------------------------
+#ifndef _EOMUTATION_H
+#define _EOMUTATION_H
+
+#include <math.h>
+// EO includes
+#include <eoOp.h>
+#include <eoUniform.h>
+
+/** Generic Mutation of an EO. 
+    This is a virtual class, just to establish the interface
+*/
+
+template <class EOT>
+class eoMutation: public eoMonOp<EOT> {
+public:
+  
+  ///
+  eoMutation(const double _rate=0.0) : eoMonOp< EOT >(), rate(_rate) {};
+  
+  ///
+  virtual ~eoMutation() {};
+  
+  ///
+  virtual void operator()( EOT& _eo ) const {
+    for ( unsigned i = 0; i < _eo.length(); i ++ )
+      applyAt( _eo, i );
+  }
+  
+  /// To print me on a stream.
+  /// @param os The ostream.
+  void printOn(ostream& os) const {
+    os << rate ;
+  }
+  
+  /// To read me from a stream.
+  /// @param is The istream.
+  void readFrom(istream& is) {
+    is >> rate ;
+  }
+      
+  /** @name Methods from eoObject
+  */  
+  //@{
+  /** Inherited from eoObject 
+      @see eoObject
+  */
+  string className() const {return "eoMutation";};
+  //@}
+
+protected:
+  double rate;  
+  
+private:  
+#ifdef _MSC_VER
+  typedef EOT::Type Type;
+#else
+  typedef typename EOT::Type Type;
+#endif
+  
+  /// applies operator to one gene in the EO. It is empty, so each descent class must define it.
+  virtual void applyAt( EOT& _eo, unsigned _i ) const = 0 ;
+};
+
+
+
+/** Mutation of an eoString.
+    The eoString's genes are changed by adding or substracting 1 to 
+*/
+
+template <class EOT>
+class eoStringMutation: public eoMutation<EOT> {
+ public:
+  
+  ///
+  eoStringMutation(const double _rate=0.0) : eoMutation< EOT >(_rate) {};
+  
+  ///
+  virtual ~eoStringMutation() {};
+  
+  /** @name Methods from eoObject
+  */
+  //@{
+  /** Inherited from eoObject 
+      @see eoObject
+  */
+  string className() const {return "eoStringMutation";};
+  //@}
+  
+  
+ private:
+  
+#ifdef _MSC_VER
+  typedef EOT::Type Type;
+#else
+  typedef typename EOT::Type Type;
+#endif
+  
+  /// applies operator to one gene in the EO. It increments or decrements the value of that gene by one.
+  virtual void applyAt( EOT& _eo, unsigned _i ) const {
+    eoUniform<double> uniform( 0, 1 );
+    if( rate < uniform() ) {
+      _eo.gene(_i) += ( uniform()>=0.5 )? (1) : (-1) ;
+    }
+  }
+
+};
+
+//-----------------------------------------------------------------------------
+
+#endif