diff src/boost_ex.hpp @ 0:add35537fdbb tip

Initial import

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/boost_ex.hpp	Thu Aug 25 11:05:55 2011 +0100
@@ -0,0 +1,73 @@
+//  Copyright 2011, Ian Hobson.
+//
+//  This file is part of gpsynth.
+//
+//  gpsynth is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  gpsynth 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 General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with gpsynth in the file COPYING. 
+//  If not, see http://www.gnu.org/licenses/.
+
+// Boost helper functions
+
+#pragma once
+
+#include "boost/foreach.hpp"
+#include "boost/random/mersenne_twister.hpp"
+#include "boost/random/normal_distribution.hpp"
+#include "boost/random/variate_generator.hpp"
+#include "boost/shared_array.hpp"
+#include "boost/thread.hpp"
+
+#include <cstddef>
+#include <ctime>
+
+// foreach macro
+#define foreach BOOST_FOREACH
+#define foreach_reverse BOOST_REVERSE_FOREACH
+
+namespace bx {
+  
+  // Sleep the current thread for a certain number of milliseconds
+  inline void SleepMs(int milliseconds) {
+    boost::this_thread::sleep(boost::posix_time::milliseconds(milliseconds));
+  }
+  
+  // boost.random helpers
+  typedef boost::random::mt19937 EngineType;
+  typedef boost::variate_generator<EngineType, boost::normal_distribution<> >
+    GaussianGenerator;
+  
+  class Random {
+    EngineType engine_;
+    
+  public:
+    Random() : engine_(static_cast<unsigned int>(std::time(0))) {}
+    EngineType& Engine() { return engine_; }
+    
+    static Random& Singleton() {
+      static Random random;
+      return random;
+    }
+  };
+
+  static GaussianGenerator MakeGaussianGenerator(double mean = 0.0,
+                                                 double sigma = 1.0) {
+    boost::normal_distribution<> distribution(mean, sigma);
+    return GaussianGenerator(Random::Singleton().Engine(), distribution);
+  }
+  
+  static EngineType& RandomEngine() {
+    return Random::Singleton().Engine();
+  }
+  
+  
+} // bx namespace