IMP: constants.h Source File

00001 /**
00002  *  \file constants.h    \brief Various useful constants.
00003  *
00004  *  Copyright 2007-2010 IMP Inventors. All rights reserved.
00005  *
00006  */
00007 
00008 #ifndef IMP_CONSTANTS_H
00009 #define IMP_CONSTANTS_H
00010 
00011 #include "kernel_config.h"
00012 #include <cmath>
00013 
00014 IMP_BEGIN_NAMESPACE
00015 
00016 #if defined(_GLIBCXX_USE_C99_MATH) && defined(__GNUC__)
00017 //! the constant pi
00018 static const double PI= M_PI;
00019 #else
00020 //! the constant pi
00021 static const double PI = 3.1415926535897931;
00022 #endif // C99
00023 
00024 IMP_END_NAMESPACE
00025 
00026 #endif  /* IMP_CONSTANTS_H */