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