COIN-OR::LEMON - Graph Library

source: lemon-1.2/lemon/math.h @ 783:ef88c0a30f85

Last change on this file since 783:ef88c0a30f85 was 511:06787db0ef5f, checked in by Alpar Juttner <alpar@…>, 11 years ago

Change LEMON's isnan() to isNaN() for the sake of AIX/xlC

Certain xlC versions implement isnan() as a #define.

File size: 2.1 KB
Line 
1/* -*- mode: C++; indent-tabs-mode: nil; -*-
2 *
3 * This file is a part of LEMON, a generic C++ optimization library.
4 *
5 * Copyright (C) 2003-2009
6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
7 * (Egervary Research Group on Combinatorial Optimization, EGRES).
8 *
9 * Permission to use, modify and distribute this software is granted
10 * provided that this copyright notice appears in all copies. For
11 * precise terms see the accompanying LICENSE file.
12 *
13 * This software is provided "AS IS" with no warranty of any kind,
14 * express or implied, and with no claim as to its suitability for any
15 * purpose.
16 *
17 */
18
19#ifndef LEMON_MATH_H
20#define LEMON_MATH_H
21
22///\ingroup misc
23///\file
24///\brief Some extensions to the standard \c cmath library.
25///
26///Some extensions to the standard \c cmath library.
27///
28///This file includes the standard math library (cmath).
29
30#include<cmath>
31
32namespace lemon {
33
34  /// \addtogroup misc
35  /// @{
36
37  /// The Euler constant
38  const long double E       = 2.7182818284590452353602874713526625L;
39  /// log_2(e)
40  const long double LOG2E   = 1.4426950408889634073599246810018921L;
41  /// log_10(e)
42  const long double LOG10E  = 0.4342944819032518276511289189166051L;
43  /// ln(2)
44  const long double LN2     = 0.6931471805599453094172321214581766L;
45  /// ln(10)
46  const long double LN10    = 2.3025850929940456840179914546843642L;
47  /// pi
48  const long double PI      = 3.1415926535897932384626433832795029L;
49  /// pi/2
50  const long double PI_2    = 1.5707963267948966192313216916397514L;
51  /// pi/4
52  const long double PI_4    = 0.7853981633974483096156608458198757L;
53  /// sqrt(2)
54  const long double SQRT2   = 1.4142135623730950488016887242096981L;
55  /// 1/sqrt(2)
56  const long double SQRT1_2 = 0.7071067811865475244008443621048490L;
57
58  ///Check whether the parameter is NaN or not
59 
60  ///This function checks whether the parameter is NaN or not.
61  ///Is should be equivalent with std::isnan(), but it is not
62  ///provided by all compilers.
63  inline bool isNaN(double v)
64    {
65      return v!=v;
66    }
67
68  /// @}
69
70} //namespace lemon
71
72#endif //LEMON_TOLERANCE_H
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