1 files changed, 28 insertions, 0 deletions
diff --git a/Swiften/Base/FloatCompare.h b/Swiften/Base/FloatCompare.h
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--- /dev/null
+++ b/Swiften/Base/FloatCompare.h
@@ -0,0 +1,28 @@
+/*
+ * 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);
+	}
+}