NumericConstants.h

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#ifndef HYDROBRICKS_NUMERIC_CONSTANTS_H
#define HYDROBRICKS_NUMERIC_CONSTANTS_H
 
#include <cmath>
#include <limits>
 
namespace NumericConstants {
 
static const double EPSILON_D = std::numeric_limits<double>::epsilon();
 
static const double EPSILON_F = std::numeric_limits<float>::epsilon();
 
static const double PRECISION = 0.00000001;
 
static const double TOLERANCE_LOOSE = 0.0001;
 
inline bool NearlyEqual(double a, double b, double tolerance = PRECISION) {
    return std::fabs(a - b) <= tolerance;
}
 
inline bool NearlyZero(double value, double tolerance = PRECISION) {
    return std::fabs(value) <= tolerance;
}
 
inline bool GreaterThan(double a, double b, double tolerance = PRECISION) {
    return a > b + tolerance;
}
 
inline bool LessThan(double a, double b, double tolerance = PRECISION) {
    return a < b - tolerance;
}
 
inline bool GreaterThanOrEqual(double a, double b, double tolerance = PRECISION) {
    return a >= b - tolerance;
}
 
inline bool LessThanOrEqual(double a, double b, double tolerance = PRECISION) {
    return a <= b + tolerance;
}
 
}  // namespace NumericConstants
 
// Expose constants in global namespace
using NumericConstants::EPSILON_D;
using NumericConstants::EPSILON_F;
using NumericConstants::PRECISION;
using NumericConstants::TOLERANCE_LOOSE;
 
// Convenience functions in global namespace
using NumericConstants::GreaterThan;
using NumericConstants::GreaterThanOrEqual;
using NumericConstants::LessThan;
using NumericConstants::LessThanOrEqual;
using NumericConstants::NearlyEqual;
using NumericConstants::NearlyZero;
 
#endif  // HYDROBRICKS_NUMERIC_CONSTANTS_H