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Wrapping number to range

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How can I wrap a number round so it stays within a range? eg keeping a direction number between PI and -PI(radians) or 180 and -180(degrees) I considered using two while loops, to do this at set points, but was wondering if theres a faster way...
double WrapRadians(double Dir)
    while(Dir >   M_PI)Dir -= M_PI;
    while(Dir <= -M_PI)Dir += M_PI;
    return Dir;

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