zero_checker.hpp

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#ifndef SGDK_MATH_ZERO_CHECKER_HPP
#define SGDK_MATH_ZERO_CHECKER_HPP

namespace sgdk {


template <
#ifndef SGDK_DOX
    typename RealNumber = float
#endif  /* SGDK_DOX */
>
class ZeroChecker
{
 private:
    RealNumber _zero_tolerance;

 public:

    explicit ZeroChecker(const RealNumber zero_tolerance = 0.00001f)
      : _zero_tolerance((zero_tolerance < 0) ? -zero_tolerance : zero_tolerance)
    {
    }


    ZeroChecker(const ZeroChecker& copy)
      : _zero_tolerance(copy._zero_tolerance)
    {
    }


    ZeroChecker& operator=(const ZeroChecker& copy)
    {
        _zero_tolerance = copy._zero_tolerance;
        return *this;
    }

    inline bool isZero(const RealNumber zero) const
    {
        return (-_zero_tolerance <= zero) && (zero <= _zero_tolerance);
    }

    inline RealNumber getZeroTolerance() const
    {
        return _zero_tolerance;
    }

    inline void setZeroTolerance(const RealNumber zero_tolerance)
    {
        _zero_tolerance
          = (zero_tolerance < 0) ? -zero_tolerance : zero_tolerance;
    }
};
}  // namespace sgdk

#endif  /* SGDK_MATH_ZERO_CHECKER_HPP */

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