/*
 * Copyright (c) 2012 Yoann Blein
 * Licensed under the simplified BSD license.
 * See Documentation/Licenses/BSD-simplified.txt for more information.
 */

#pragma once

#include <cmath>
#include <limits>

namespace Swift {
	bool approximatelyEqual(float a, float b, float epsilon = std::numeric_limits<float>::epsilon()) {
		return std::fabs(a - b) <= ( (std::fabs(a) < std::fabs(b) ? std::fabs(b) : std::fabs(a)) * epsilon);
	}

	bool essentiallyEqual(float a, float b, float epsilon = std::numeric_limits<float>::epsilon()) {
		return std::fabs(a - b) <= ( (std::fabs(a) > std::fabs(b) ? std::fabs(b) : std::fabs(a)) * epsilon);
	}

	bool definitelyGreaterThan(float a, float b, float epsilon = std::numeric_limits<float>::epsilon()) {
		return (a - b) > ( (std::fabs(a) < std::fabs(b) ? std::fabs(b) : std::fabs(a)) * epsilon);
	}

	bool definitelyLessThan(float a, float b, float epsilon = std::numeric_limits<float>::epsilon()) {
		return (b - a) > ( (std::fabs(a) < std::fabs(b) ? std::fabs(b) : std::fabs(a)) * epsilon);
	}
}