From ce031f10a3a371f3687009ebfc3dc779d0e66900 Mon Sep 17 00:00:00 2001
From: evomarc <evomarc>
Date: Fri, 26 Jan 2001 04:06:09 +0000
Subject: [PATCH] Added eoRandomReduce

---
 eo/src/eoReduce.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/eo/src/eoReduce.h b/eo/src/eoReduce.h
index 715a412c0..a653f8ef2 100644
--- a/eo/src/eoReduce.h
+++ b/eo/src/eoReduce.h
@@ -60,6 +60,22 @@ template <class EOT> class eoTruncate : public eoReduce<EOT>
     }
 };
 
+/** random truncation */
+template <class EOT> class eoRandomReduce : public eoReduce<EOT>
+{
+    void operator()(eoPop<EOT>& _newgen, unsigned _newsize)
+    {
+        if (_newgen.size() == _newsize)
+            return;
+	if (_newgen.size() < _newsize)
+	  throw std::logic_error("eoRandomReduce: Cannot truncate to a larger size!\n");
+
+	// shuffle the population, then trucate
+	_newgen.shuffle();
+	_newgen.resize(_newsize);
+    }
+};
+
 /** 
 EP truncation method (some global stochastic tournament +  sort)
 Softer selective pressure than pure truncate