Mathematical Constants

M_PI, M_SQRT2 etc.

#include <vigra/mathutil.hxx>

Since mathematical constants such as M_PI and M_SQRT2 are not officially standardized, we provide definitions here for those compilers that don't support them.

#ifndef M_PI
#    define M_PI     3.14159265358979323846
#endif

#ifndef M_SQRT2
#    define M_2_PI   0.63661977236758134308
#endif

#ifndef M_PI_2
#    define M_PI_2   1.57079632679489661923
#endif

#ifndef M_PI_4
#    define M_PI_4   0.78539816339744830962
#endif

#ifndef M_SQRT2
#    define M_SQRT2  1.41421356237309504880
#endif

#ifndef M_EULER_GAMMA
#    define M_EULER_GAMMA  0.5772156649015329
#endif