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+/* -*- mode: C++; indent-tabs-mode: nil; -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library.
+ *
+ * Copyright (C) 2003-2013
+ * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Research Group on Combinatorial Optimization, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+#ifndef LEMON_MATH_H
+#define LEMON_MATH_H
+
+///\ingroup misc
+///\file
+///\brief Some extensions to the standard \c cmath library.
+///
+///Some extensions to the standard \c cmath library.
+///
+///This file includes the standard math library (cmath).
+
+#include<cmath>
+
+namespace lemon {
+
+  /// \addtogroup misc
+  /// @{
+
+  /// The Euler constant
+  const long double E       = 2.7182818284590452353602874713526625L;
+  /// log_2(e)
+  const long double LOG2E   = 1.4426950408889634073599246810018921L;
+  /// log_10(e)
+  const long double LOG10E  = 0.4342944819032518276511289189166051L;
+  /// ln(2)
+  const long double LN2     = 0.6931471805599453094172321214581766L;
+  /// ln(10)
+  const long double LN10    = 2.3025850929940456840179914546843642L;
+  /// pi
+  const long double PI      = 3.1415926535897932384626433832795029L;
+  /// pi/2
+  const long double PI_2    = 1.5707963267948966192313216916397514L;
+  /// pi/4
+  const long double PI_4    = 0.7853981633974483096156608458198757L;
+  /// sqrt(2)
+  const long double SQRT2   = 1.4142135623730950488016887242096981L;
+  /// 1/sqrt(2)
+  const long double SQRT1_2 = 0.7071067811865475244008443621048490L;
+
+  ///Check whether the parameter is NaN or not
+
+  ///This function checks whether the parameter is NaN or not.
+  ///Is should be equivalent with std::isnan(), but it is not
+  ///provided by all compilers.
+  inline bool isNaN(double v)
+    {
+      return v!=v;
+    }
+
+  ///Round a value to its closest integer
+  inline double round(double r) {
+    return (r > 0.0) ? std::floor(r + 0.5) : std::ceil(r - 0.5);
+  }
+
+  /// @}
+
+} //namespace lemon
+
+#endif //LEMON_MATH_H