Differential D5594 Diff 18104 extern/quadriflow/3rd/lemon-1.3.1/lemon/math.h

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extern/quadriflow/3rd/lemon-1.3.1/lemon/math.h

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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