A continuator which periodically returns false

eo/src/paradisEO/island/eoCyclicGenContinue.h

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+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+// "eoCyclicGenContinue.h"
+
+// (c) OPAC Team, LIFL, 2002
+
+/* 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
+   
+   Cont	act: cahon@lifl.fr
+*/
+
+#ifndef eoCyclicGenContinue_h
+#define eoCyclicGenContinue_h
+
+#include <eoContinue.h>
+#include <eoPop.h>
+
+/** 
+    This continuator returns false in a periodic way during generations. 
+*/
+
+template <class EOT> class eoCyclicGenContinue: public eoContinue <EOT> {
+
+public:
+  
+  /**
+     Constructor. The frequency is given in parameter.
+   */
+
+  eoCyclicGenContinue (unsigned _freq,
+		       unsigned init_count = 0) :
+    freq (_freq),
+    count (init_count) {
+  }
+
+  /** 
+      Return true only if the current number of performed generations
+      modulo the frequency equals none.
+   */
+
+  virtual bool operator () (const eoPop <EOT> & pop) {
+    
+    count ++ ;
+    return (count % freq) != 0 ;
+  }
+
+private:
+  
+  unsigned count, freq ;
+} ;
+
+#endif
+