Diff: tvmet/util/Random.h

Revision:

15:9c5aaeda36dc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tvmet/util/Random.h	Sat Apr 06 20:57:54 2013 +0000
@@ -0,0 +1,101 @@
+/*
+ * Tiny Vector Matrix Library
+ * Dense Vector Matrix Libary of Tiny size using Expression Templates
+ *
+ * Copyright (C) 2001 - 2007 Olaf Petzold <opetzold@users.sourceforge.net>
+ *
+ * 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 2.1 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
+ *
+ * $Id: Random.h,v 1.7 2007-06-23 15:58:59 opetzold Exp $
+ */
+
+#ifndef TVMET_UTIL_RANDOM_H
+#define TVMET_UTIL_RANDOM_H
+
+#include <tvmet/CompileTimeError.h>
+
+namespace tvmet {
+
+namespace util {
+
+
+/**
+ * \class Random Random.h "tvmet/util/Random.h"
+ * \brief A simple random class.
+ * On each access this class returns a new random number using
+ * std::rand(). The range generated is templated by MIN and
+ * MAX.
+ * \ingroup _util_function
+ *
+ * \par Example:
+ * \code
+ * #include <algorithm>
+ *
+ * tvmet::Random<int, 0, 100>                random;
+ *
+ * std::generate(m1.begin(), m1.end(), random());
+ * \endcode
+ */
+template<class T, int MIN=0, int MAX=100>
+class Random {
+  static unsigned int                s_seed;
+public:
+  typedef T                    value_type;
+  Random() { TVMET_CT_CONDITION(MIN<MAX, wrong_random_range) }
+  value_type operator()() {
+    s_seed += (unsigned)std::time(0);
+    std::srand(s_seed);
+    return MIN + int(double(MAX) * std::rand()/(double(RAND_MAX)+1.0));
+  }
+};
+// instance
+template<class T, int MIN, int MAX>
+unsigned int Random<T, MIN, MAX>::s_seed;
+
+
+#if defined(TVMET_HAVE_COMPLEX)
+/**
+ * \class Random< std::complex<T> > Random.h "tvmet/util/Random.h"
+ * \brief Specialized Random class.
+ * \ingroup _util_function
+ */
+template<class T, int MIN=0, int MAX=100>
+class Random {
+  static unsigned int                s_seed;
+public:
+  typedef std::complex<T>            value_type;
+  Random() { TVMET_CT_CONDITION(MIN<MAX, wrong_random_range) }
+  value_type operator()() {
+    s_seed += (unsigned)std::time(0);
+    std::srand(s_seed);
+    return MIN + int(double(MAX) * std::rand()/(double(RAND_MAX)+1.0));
+  }
+};
+// instance
+template<class T, int MIN, int MAX>
+unsigned int Random<std::complex<T>, MIN, MAX>::s_seed;
+#endif // defined(TVMET_HAVE_COMPLEX)
+
+
+} // namespace util
+
+} // namespace tvmet
+
+#endif // TVMET_UTIL_RANDOM_H
+
+// Local Variables:
+// mode:C++
+// tab-width:8
+// End: