Merge branch 'master' of gitlab.2:f1x1t/myxlib

src/myx/math/almost_equal_ulps_and_abs.cpp

@@ -0,0 +1,73 @@
+#include <myx/math/float_cmp_types.hpp>
+#include <myx/math/almost_equal_ulps_and_abs.hpp>
+
+#include <cmath>
+
+namespace myx {
+
+namespace math {
+
+bool almost_equal_ulps_and_abs( const float a, const float b,
+                                const float maxAbsDiff, const int maxUlpsDiff )
+{
+	// Check if the numbers are really close -- needed
+	// when comparing numbers near zero.
+	float absDiff = fabsf( a - b );
+	if ( absDiff <= maxAbsDiff )
+	{
+		return( true );
+	}
+
+	float_cmp_t uA( a );
+	float_cmp_t uB( b );
+
+	// Different signs means they do not match.
+	if ( uA.negative() != uB.negative() )
+	{
+		return( false );
+	}
+
+	// Find the difference in ULPs.
+	int ulpsDiff = std::abs( uA.i - uB.i );
+	if ( ulpsDiff <= maxUlpsDiff )
+	{
+		return( true );
+	}
+
+	return( false );
+} // almost_equal_ulps_and_abs
+
+
+bool almost_equal_ulps_and_abs( const double a, const double b,
+                                const double maxAbsDiff, const int maxUlpsDiff )
+{
+	// Check if the numbers are really close -- needed
+	// when comparing numbers near zero.
+	double absDiff = fabs( a - b );
+	if ( absDiff <= maxAbsDiff )
+	{
+		return( true );
+	}
+
+	double_cmp_t uA( a );
+	double_cmp_t uB( b );
+
+	// Different signs means they do not match.
+	if ( uA.negative() != uB.negative() )
+	{
+		return( false );
+	}
+
+	// Find the difference in ULPs.
+	auto ulpsDiff = std::abs( uA.i - uB.i );
+	if ( ulpsDiff <= maxUlpsDiff )
+	{
+		return( true );
+	}
+
+	return( false );
+} // almost_equal_ulps_and_abs
+
+} // namespace math
+
+} // namespace myx