Re: _USE_MATH_DEFINES bug

"Joseph M. Newcomer" <newcomer@flounder.com> ha scritto nel messaggio
news:628qu3pj0k37druqrv48v1ifl04bhvifef@4ax.com...


I find it a bit strange that they provide the raw C preprocessor #defines
and not a robust C++ class or namespace.
However, you may find the following (trivial) conversion to C++ namespace I
did to be useful:

<code>

//
// Definitions of useful mathematical constants
//
namespace MathConstants
{
    const double E = 2.71828182845904523536; // e
    const double Log2E = 1.44269504088896340736; // log2(e)
    const double Log10E = 0.434294481903251827651; // log10(e)
    const double Ln2 = 0.693147180559945309417; // ln(2)
    const double Ln10 = 2.30258509299404568402; // ln(10)
    const double Pi = 3.14159265358979323846; // pi
    const double Pi2 = 1.57079632679489661923; // pi/2
    const double Pi4 = 0.785398163397448309616; // pi/4
    const double InvPi = 0.318309886183790671538; // 1/pi
    const double TwoOverPi = 0.636619772367581343076; // 2/pi
    const double TwoOverSqrtPi = 1.12837916709551257390; // 2/sqrt(pi)
    const double Sqrt2 = 1.41421356237309504880; // sqrt(2)
    const double InvSqrt2 = 0.707106781186547524401; // 1/sqrt(2)
};

</code>

So you can write code like: MathConstants::E, MathConstants::Pi, etc.

No need for fragile preprocessor stuff...

Giovanni