fix(rnd): use STL's rand gen for shuffles

Previous implementation used Paradiseo's own random generator system,
now superseeded by the STL's one.

eo/src/eoInit.h

@@ -29,11 +29,12 @@
 
 #include <algorithm>
 #include <cassert>
+#include <random>
 
 #include "eoOp.h"
 #include "eoSTLFunctor.h"
 #include "utils/eoRndGenerators.h"
-#include "utils/rnd_generators.h"  // for shuffle method
+// #include "utils/rnd_generators.h"  // for shuffle method
 #include "eoExceptions.h"
 
 
@@ -197,7 +198,8 @@ class eoInitPermutation: public eoInit<EOT> // FIXME inherit from eoInitWithDim
                 chrom[idx] = idx+startFrom;
             }
 
-            UF_random_generator<unsigned int> gen(chrom.size());
+            std::random_device rd;
+            std::mt19937 gen(rd());
             std::shuffle(chrom.begin(), chrom.end(), gen);
             chrom.invalidate();
         }

eo/src/eoPop.h

@@ -45,7 +45,7 @@ Authors:
 #include "eoOp.h" // for eoInit
 #include "eoPersistent.h"
 #include "eoInit.h"
-#include "utils/rnd_generators.h"  // for shuffle method
+// #include "utils/rnd_generators.h"  // for shuffle method
 #include "eoExceptions.h"
 
 /** A std::vector of EO object, to be used in all algorithms

eo/src/utils/rnd_generators.h

@@ -124,6 +124,7 @@ inline bool random_generator<bool>::operator()(void)
    function (see eoPop::shuffle): its operator() takes an unsigned argument m
    and  must return an unsigned uniformly distributed in [0,m}
 */
+// FIXME this is probably deprecated by the new STL way of managing random generators.
 template <class T = uint32_t>
 class UF_random_generator
 {
@@ -134,11 +135,11 @@ class UF_random_generator
             : _max(max), _random(_rng)
         {}
 
-        T operator()() { return _random.random(_max); }
-        T operator()(T m) { return _random.random(m); }
+        T operator()() const { return _random.random(_max); }
+        T operator()(T m) const { return _random.random(m); }
 
-        T min() { return 0; }
-        T max() { return _max; }
+        T min() const { return 0; }
+        T max() const { return _max; }
 
     private :
         T _max;

moeo/src/selection/moeoNumberUnvisitedSelect.h

@@ -39,6 +39,8 @@
 #ifndef _MOEONUMBERUNVISITEDSELECT_H
 #define _MOEONUMBERUNVISITEDSELECT_H
 
+#include <random>
+
 #include <eoPop.h>
 #include <selection/moeoUnvisitedSelect.h>
 
@@ -51,10 +53,10 @@ class moeoNumberUnvisitedSelect : public moeoUnvisitedSelect < MOEOT >
 
 public:
 
-	/**
-	 * Constructor
-	 * @param _number the number of individuals to select
-	 */
+    /**
+     * Constructor
+     * @param _number the number of individuals to select
+     */
     moeoNumberUnvisitedSelect(unsigned int _number): number(_number){}
 
     /**
@@ -64,24 +66,25 @@ public:
      */
     std::vector <unsigned int> operator()(eoPop < MOEOT > & _src)
     {
-    	std::vector <unsigned int> res;
-    	res.resize(0);
+        std::vector <unsigned int> res;
+        res.resize(0);
         for (unsigned int i=0; i<_src.size(); i++)
         {
             if (_src[i].flag() == 0)
-            	res.push_back(i);
+                res.push_back(i);
         }
         if(number < res.size()){
-        	UF_random_generator<unsigned int> rndGen(res.size());
-        	std::random_shuffle(res.begin(), res.end(), rndGen);
-        	res.resize(number);
+            std::random_device rd;
+            std::mt19937 gen(rd());
+            std::shuffle(res.begin(), res.end(), gen);
+            res.resize(number);
         }
         return res;
     }
 
 private:
-	/** number of individuals to select */
-	unsigned int number;
+    /** number of individuals to select */
+    unsigned int number;
 
 };