mathutils.h

C++&datastructure书籍源码,以前外教提供现在与大家共享

#ifndef  _MATHUTIL_H
#define _MATHUTIL_H

bool FloatEqual(double lhs, double rhs);
// post: returns true iff lhs == rhs 
//       where == is determined by using relative error, i.e.
//       |lhs-rhs| / min(|lhs|,|rhs|)     


// convert degrees to radians and vice versa

double deg2rad(double deg);
double rad2deg(double rad);

const double PI = 3.1415926535897;

// returns smaller of lhs and rhs, operator < must
// be overloaded for the type T

template <class T>
T min(const T& lhs, const T& rhs)
{
    return lhs < rhs ? lhs : rhs;
}

// returns larger of lhs and rhs, operator < must
// be overloaded for the type T

template <class T>
T max(const T& lhs, const T& rhs)
{
    return lhs < rhs ? rhs : lhs;
}

#endif