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) 2003-2010 |
---|

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 | |
---|

32 | namespace 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 |
---|