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eo/src/utils/rnd_generators.h

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+/* -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+
+  -----------------------------------------------------------------------------
+  rnd_generators.h
+    Some utility functors for generating random generators:
+        uniform_generator : generates uniform floats or doubles
+        random_generator  : generates unsigneds, ints etc.
+        normal_generator  : normally distributed floats or doubles
+
+ (c) Maarten Keijzer (mak@dhi.dk) and GeNeura Team, 1999, 2000
+ 
+    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 eoRND_GENERATORS_H
+#define eoRND_GENERATORS_H
+
+#include "eoRNG.h"
+
+/**
+   The class uniform_generator can be used in the STL generate function
+   to easily generate random floats and doubles between [0, _max). _max
+   defaults to 1.0
+*/
+template <class T = double> class uniform_generator
+{
+  public :
+    uniform_generator(T _max = T(1.0), eoRng& _rng = rng) : maxim(_max), uniform(_rng) {}
+  
+  virtual T operator()(void) { return (T) uniform.uniform(maxim); } 
+  private :
+    T maxim;
+  eoRng& uniform;
+};
+
+/**
+   The class random_generator can be used in the STL generate function
+   to easily generate random ints between [0, _max).
+*/
+template <class T = uint32> class random_generator
+{
+  public :
+    random_generator(int _max, eoRng& _rng = rng) : maxim(_max), random(_rng) {}
+  
+  virtual T operator()(void) { return (T) random.random(max); }
+  
+  private :
+    T maxim;
+  eoRng& random;
+};
+
+/**
+   The class normal_generator can be used in the STL generate function
+   to easily generate gaussian distributed floats and doubles. The user
+   can supply a standard deviation which defaults to 1.
+*/
+template <class T = double> class normal_generator
+{
+  public :
+    normal_generator(T _stdev = T(1.0), eoRng& _rng = rng) : stdev(_stdev), normal(_rng) {}
+  
+  virtual T operator()(void) { return (T) normal.normal(stdev); }
+  
+  private :
+    T stdev;
+  eoRng& normal;
+};
+
+#endif