ApproximatelyEqualTo.hpp

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#pragma once
 
#include <cmath>
 
namespace Math
{
 
inline bool approximately_equal_to(float input, float near_to, float tolerance = 0.0002f)
{
    return std::abs(near_to - input) <= tolerance;
}
 
inline bool approximately_equal_to(double input, double near_to, double tolerance = 0.0002)
{
    return std::abs(near_to - input) <= tolerance;
}
 
inline bool approximately_equal_to(long double input, long double near_to, long double tolerance = 0.0002l)
{
    return std::abs(near_to - input) <= tolerance;
}
 
inline int three_way_compare(float left, float right, float tolerance = 0.0002f)
{
    if ( approximately_equal_to(left, right, tolerance) )
        return 0;
 
    return (left < right) ? -1 : 1;
}
 
inline int three_way_compare(double left, double right, double tolerance = 0.0002)
{
    if ( approximately_equal_to(left, right, tolerance) )
        return 0;
 
    return (left < right) ? -1 : 1;
}
 
inline int three_way_compare(long double left, long double right, long double tolerance = 0.0002l)
{
    if ( approximately_equal_to(left, right, tolerance) )
        return 0;
 
    return (left < right) ? -1 : 1;
}
 
}